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Taxon author: Hack.

ITIS records citing taxon author "Hack."
 
 Kingdom Animalia
  Actineria dendrophora Haddon and Shackleton, 1893 -- valid
  Actinothoe milmani (Haddon and Shackleton, 1893) -- valid
  Alicia rhadina Haddon and Shackleton, 1893 -- valid
  Allocader cordatus (Hacker, 1927) -- valid
  Allocader leai (Hacker, 1928) -- valid
  Allodia embia Hackman, 1971 -- valid
  Allodia septentrionalis Hackman, 1971 -- valid
  Allodia tuomikoskii Hackman, 1971 -- valid
  Anthopleura dixoniana (Haddon and Shackleton, 1893) -- valid
  Argogorytes cruciger (Hacker and Cockerell, 1922) -- valid
  Arpactus cruciger Hacker and Cockerell, 1922 -- invalid
  Australotingis Hacker, 1927 -- valid
  Australotingis franzeni Hacker, 1927 -- valid
  Barbus arcislongae Keilhack, 1908 -- valid
  Barbus eurystomus Keilhack, 1908 -- valid
  Bunotingis camelina (Hacker, 1948) -- valid
  Calotingis subopaca (Hacker, 1928) -- valid
  Cantacader nocturnis Hacker, 1929 -- valid
  Carldrakeana tindalei (Hacker, 1928) -- valid
  Ceratocader armatus (Hacker, 1928) -- valid
  Ceratocader dentatus (Hacker, 1928) -- valid
  Collinsia palmeni Hackman, 1954 -- valid
  Cyathura madelinae Hackney and Ganucheau, 1989 -- valid
  Cyathura madelinae Hackney and Ganucheau, 1989 -- invalid
  Cysteochila brunnea Hacker, 1928 -- valid
  Cysteochila tricolor (Hacker, 1929) -- valid
  Diplocysta globuliformis Hacker, 1928 -- valid
  Engynoma angulata (Hacker, 1929) -- valid
  Epizoanthus macintoshi Haddon and Shackleton, 1891 -- valid
  Esocampylia Hacker, 1929 -- valid
  Esocampylia incarinata Hacker, 1929 -- valid
  Evermannichthys bicolor Thacker, 2001 -- valid
  Gonycentrum tindalei (Hacker, 1928) -- invalid
  Gorytes crucigera (Hacker and Cockerell, 1922) -- invalid
  Gryon indicum (Subba Rao & Chacko, 1962) -- valid
  Gryon karnalense Chacko & Katiyar, 1961 -- valid
  Gryon nigroides (Subba Rao & Chacko, 1962) -- valid
  Gryon testaceum (Subba Rao & Chacko, 1962) -- valid
  Gymnotingis Hacker, 1928 -- valid
  Gymnotingis serrulata Hacker, 1928 -- valid
  Heteractis malu (Haddon and Shackleton, 1893) -- valid
  Inoma Hacker, 1927 -- valid
  Inoma multispinosa Hacker, 1927 -- valid
  Kaestneria rufula (Hackman, 1954) -- valid
  Labeobarbus brevicauda (Keilhack, 1908) -- valid
  Labeobarbus litamba (Keilhack, 1908) -- valid
  Lasiacantha leai (Hacker, 1928) -- valid
  Lepiselaga fenestrata Hack, 1953 -- invalid
  Leptopharsa elegans (Hacker, 1927) -- valid
  Lepturga magnifica (Hacker, 1929) -- valid
  Lepturga major (Hacker, 1929) -- valid
  Macrodactyla aspera (Haddon and Shackleton, 1893) -- valid
  Malandiola similis Hacker, 1927 -- valid
  Nethersia setosa (Hacker, 1927) -- valid
  Oediopalpa titschacki (Uhmann in Titschack, 1942) -- valid
  Oncophysa rufescens Hacker, 1928 -- valid
  Oncophysa vesiculata gracilis Hacker, 1928 -- valid
  Oncophysa vesiculata nigra Hacker, 1928 -- valid
  Paracopium albofasciatum Hacker, 1927 -- valid
  Paracopium summervillei (Hacker, 1927) -- valid
  Paraphellia hunti Haddon and Shackleton, 1893 -- valid
  Paraphellia lineata Haddon and Shackleton, 1893 -- valid
  Parazoanthus Haddon and Shackleton, 1891 -- valid
  Phronia digitata Hackman, 1970 -- valid
  Phronia distincta Hackman, 1970 -- valid
  Phronia gracilis Hackman, 1970 -- valid
  Phronia lutescens Hackman, 1970 -- valid
  Phronia matilei Hackman, 1970 -- valid
  Phronia persimilis Hackman, 1970 -- valid
  Phymanthus muscosus Haddon and Shackleton, 1893 -- valid
  Physatocheila biseriata Hacker, 1929 -- valid
  Physatocheila uniseriata Hacker, 1929 -- valid
  Porrhomma gertschi Hackman, 1954 -- valid
  Pterostichus cochlearis Hacker, 1968 -- valid
  Pterostichus fenyesi fenderi Hacker, 1968 -- valid
  Pterostichus hatchi Hacker, 1968 -- valid
  Pterostichus lobatus Hacker, 1968 -- valid
  Pterostichus marinensis Hacker, 1968 -- valid
  Pterostichus mattolensis Hacker, 1968 -- valid
  Pterostichus mottolensis Hacker, 1968 -- invalid
  Pterostichus pumilus willamettensis Hacker, 1968 -- valid
  Pterostichus stapedius Hacker, 1968 -- valid
  Pterostichus trinitensis Hacker, 1968 -- valid
  Pterostichus yosemitensis Hacker, 1968 -- valid
  Radinacantha Hacker, 1929 -- valid
  Radinacantha reticulata Hacker, 1929 -- valid
  Radinacantha tasmanica Hacker, 1929 -- valid
  Rhodinoliotia Tomlin and Shackleford, 1915 -- valid
  Scaptomyza abrupta Hackman -- valid
  Scaptomyza aloha Hackman -- valid
  Scaptomyza bryanti Hackman -- valid
  Scaptomyza buccata Hackman -- valid
  Scaptomyza flaviventris Hackman, 1959 -- valid
  Scaptomyza fuscifrons Hackman -- valid
  Scaptomyza hardyi Hackman -- valid
  Scaptomyza hsui Hackman, 1955 -- valid
  Scaptomyza kauaiensis Hackman -- valid
  Scaptomyza longipecten Hackman -- valid
  Scaptomyza longipecten longipectin Hackman -- valid
  Scaptomyza longisetosa Hackman -- valid
  Scaptomyza mediopallens Hackman -- valid
  Scaptomyza mitchelli Hackman -- valid
  Scaptomyza pallifrons Hackman -- valid
  Scaptomyza parapicata Hackman, 1959 -- invalid
  Scaptomyza stamineifrons Hackman -- valid
  Scaptomyza stratifrons Hackman -- valid
  Scaptomyza teinoptera Hackman, 1955 -- valid
  Scaptomyza wheeleri Hackman, 1959 -- valid
  Sciastes dubius (Hackman, 1954) -- valid
  Sericophorus affinis (Hacker and Cockerell, 1922) -- valid
  Sericophorus argyreus (Hacker and Cockerell, 1922) -- valid
  Sericophorus collaris (Hacker and Cockerell, 1922) -- valid
  Sericophorus emarginatus (Hacker and Cockerell, 1922) -- valid
  Sericophorus fuscipennis (Hacker and Cockerell, 1922) -- invalid
  Sericophorus niger (Hacker and Cockerell, 1922) -- valid
  Sericophorus ornatus (Hacker and Cockerell, 1922) -- valid
  Sericophorus pusillus (Hacker and Cockerell, 1922) -- valid
  Sericophorus splendidus (Hacker and Cockerell, 1922) -- valid
  Stephanitis queenslandensis Hacker, 1927 -- valid
  Synodontis njassae Keilhack, 1908 -- valid
  Tanybyrsa ampliata (Hacker, 1927) -- valid
  Tanybyrsa secunda (Hacker, 1927) -- valid
  Tapinocyba lindrothi Hackman, 1954 -- valid
  Telactinia citrina (Haddon and Shackleton, 1893) -- valid
  Telmatactis daevisi (Haddon and Shackleton, 1893) -- valid
  Telmatactis sipunculoides (Haddon and Shackleton, 1893) -- valid
  Tigavaria unicarinata (Hacker, 1929) -- valid
  Tingis drakei Hacker, 1929 -- valid
  Triopsidae Keilhack, 1909 -- valid
  Urentius sarinae Hacker, 1929 -- valid
  Xenochalepus bahianus Uhmann in Titschack, 1942 -- valid
  Zoyphidium splendidum Hacker and Cockerell, 1922 -- invalid
  Zoyphium affine Hacker and Cockerell, 1922 -- invalid
  Zoyphium argyreum Hacker and Cockerell, 1922 -- invalid
  Zoyphium collare Hacker and Cockerell, 1922 -- invalid
  Zoyphium emarginatum Hacker and Cockerell, 1922 -- invalid
  Zoyphium fuscipenne Hacker and Cockerell, 1922 -- invalid
  Zoyphium nigrum Hacker and Cockerell, 1922 -- invalid
  Zoyphium ornatum Hacker and Cockerell, 1922 -- invalid
  Zoyphium pusillum Hacker and Cockerell, 1922 -- invalid
 
 Kingdom Plantae
  Achnatherum clandestinum (Hack.) Barkworth -- not accepted -- Mexican ricegrass
  Achneria curvifolia (Hack.) Stapf -- not accepted
  Acroceras fluminense (Hack.) Zuloaga & Morrone -- accepted
  Agenium goyazense (Hack.) Clayton -- not accepted
  Agenium leptocladum (Hack.) Clayton -- accepted
  Agropyron elymoides Hack. -- not accepted
  Agropyron magellanicum (E. Desv.) Hack. -- not accepted
  Agropyron repens var. scabriglume Hack. -- not accepted
  Agropyron scabriglume (Hack.) Parodi -- not accepted
  Agrostis alba var. condensata Hack. ex Druce -- not accepted
  Agrostis bacillata Hack. -- accepted
  Agrostis bogotensis Hack. -- not accepted
  Agrostis buchtienii Hack. -- not accepted
  Agrostis canina f. inclusa Hack. -- not accepted
  Agrostis canina f. mutica Hack. -- not accepted
  Agrostis canina ssp. grandiflora Hack. -- not accepted
  Agrostis canina var. falklandica (Hook. f.) Hack. -- not accepted
  Agrostis canina var. falklandica (Hook. f.) Hack. ex Skottsb. -- not accepted
  Agrostis canina var. grandiflora Hack. -- not accepted
  Agrostis canina var. grandiflora Hack. ex Druce -- not accepted
  Agrostis curvifolia Hack. -- not accepted
  Agrostis exarata var. angustifolia Hack. -- not accepted
  Agrostis fuegiana Hack. -- not accepted
  Agrostis hackelii f. viridiflora Hack. -- not accepted
  Agrostis juergensii Hack. -- not accepted
  Agrostis longiberbis Hack. ex Usteri -- not accepted
  Agrostis longiberbis Hack. ex L.B. Sm. -- accepted
  Agrostis paucinodis Hack. -- not accepted
  Agrostis pectinata Hack. & Arechav. -- not accepted
  Agrostis pittieri Hack. -- accepted
  Agrostis pyrogea var. mutica Hack. -- not accepted
  Agrostis sodiroana Hack. -- not accepted
  Agrostis umbellata var. mutica Hack. ex Macloskie & Dusén -- not accepted
  Alopecurus aequalis f. notacens (Hack.) Parodi -- not accepted
  Alopecurus aequalis f. violaceus (Hack.) Parodi -- not accepted
  Alopecurus aequalis var. violaceus (Hack.) Mariano -- not accepted
  Alopecurus alpinus f. antarctica (Vahl) Hack. -- not accepted
  Alopecurus fulvus f. violacea Hack. -- not accepted
  Alopecurus geniculatus f. robustior Hack. ex Kneuck. -- not accepted
  Alopecurus heleochloides Hack. -- accepted
  Amelichloa clandestina (Hack.) Arriaga & Barkworth -- accepted
  Amphilophis decipiens (Hack.) Moodie -- not accepted
  Amphilophis palmeri (Hack.) Nash -- not accepted
  Amphilophis piptatherus (Hack.) Nash -- not accepted
  Amphilophis wrightii (Hack.) Nash -- not accepted
  Anatherostipa (Hack. ex Kuntze) Peńailillo -- accepted
  Anatherum bourgeaei (Hack.) Roberty -- not accepted
  Anatherum virginicum subvar. arenarium (Hack.) Roberty -- not accepted
  Anatherum virginicum subvar. glaziovii (Hack.) Roberty -- not accepted
  Anatherum virginicum subvar. liebmannii (Hack.) Roberty -- not accepted
  Anatherum virginicum subvar. longiberbe (Hack.) Roberty -- not accepted
  Anatherum virginicum subvar. mohrii (Hack.) Roberty -- not accepted
  Anatherum virginicum subvar. selloanus (Hack.) Roberty -- not accepted
  Anatherum virginicum var. mohrii (Hack.) Roberty -- not accepted
  Andropogon albescens Andersson ex Hack. -- not accepted
  Andropogon annulatus var. bladhii (Retz.) Hack. -- not accepted
  Andropogon annulatus var. subrepens Hack. -- not accepted
  Andropogon arenarius Hack. -- accepted
  Andropogon arenarius f. arenarius Hack. -- not accepted
  Andropogon arenarius f. subcompletus Hack. ex Lindm. -- not accepted
  Andropogon balansae (Hack.) Hack. -- not accepted
  Andropogon bicornis var. absconditus Hack. -- not accepted
  Andropogon bicornis var. burchellii Hack. -- not accepted
  Andropogon bicornis var. gracillimus Hack. -- not accepted
  Andropogon bicornis var. hybridus Hack. -- not accepted
  Andropogon bicornis var. virginicoides Hack. -- not accepted
  Andropogon bipennatus Hack. -- not accepted
  Andropogon bogotensis (Hack.) A. Zanin & Longhi-Wagner -- accepted
  Andropogon bourgeaei Hack. -- accepted
  Andropogon brevifolius var. flaccidus (A. Rich.) Hack. -- not accepted
  Andropogon brevifolius var. leptatherus Hack. -- not accepted
  Andropogon cabanisii Hack. -- accepted
  Andropogon caricosus ssp. genuinus Hack. -- not accepted
  Andropogon caricosus ssp. mollicomus (Kunth) Hack. -- not accepted
  Andropogon caricosus var. mollicomus (Kunth) Hack. -- not accepted
  Andropogon carinatus var. exserens Hack. -- not accepted
  Andropogon carinatus var. genuinus Hack. -- not accepted
  Andropogon carinatus var. leiophyllus Hack. -- not accepted
  Andropogon cerifer Hack. -- not accepted
  Andropogon cirratus Hack. -- not accepted
  Andropogon coloratus Hack. -- accepted
  Andropogon condensatus f. lactiflorus Hack. -- not accepted
  Andropogon condensatus ssp. corymbosus Hack. -- not accepted
  Andropogon condensatus ssp. elongatus Hack. -- not accepted
  Andropogon condensatus subvar. exserens Hack. -- not accepted
  Andropogon condensatus subvar. lactiflorus Hack. -- not accepted
  Andropogon condensatus subvar. latens Hack. -- not accepted
  Andropogon condensatus subvar. typicus Hack. -- not accepted
  Andropogon condensatus var. elongatus (Hack.) Hack. -- not accepted
  Andropogon condensatus var. genuinus Hack. -- not accepted
  Andropogon condensatus var. paniculatus (Kunth) Hack. -- not accepted
  Andropogon condensatus var. typicus Hack. -- not accepted
  Andropogon condylotrichus var. piptatherus (Hack.) Chiov. -- not accepted
  Andropogon consanguineus var. genuinus Hack. -- not accepted
  Andropogon consanguineus var. humilior Hack. -- not accepted
  Andropogon contortus subvar. secundus (Willd. ex Nees) Hack. -- not accepted
  Andropogon contortus var. glaber (Pers.) Hack. -- not accepted
  Andropogon corymbosus (Chapm. ex Hack.) Nash -- not accepted
  Andropogon corymbosus var. abbreviatus (Hack.) Nash -- not accepted
  Andropogon cryptopus Trin. ex Hack. -- not accepted
  Andropogon cubensis Hack. -- not accepted
  Andropogon decipiens (Hack.) Domin -- not accepted
  Andropogon diplandrus Hack. -- not accepted
  Andropogon divergens Andersson ex Hack. -- not accepted
  Andropogon divergens (Hack.) Andersson ex Hitchc. -- not accepted
  Andropogon elliottii f. gracilior (Hack.) Blomq. -- not accepted
  Andropogon elliottii var. gracilior Hack. -- not accepted
  Andropogon exaratus Hack. -- accepted
  Andropogon filiforme Hack. ex A. Camus -- not accepted
  Andropogon gayanus var. bisquamulatus (Hochst.) Hack. -- accepted
  Andropogon geminatus Hack. ex Beal -- not accepted
  Andropogon gerardii ssp. hallii (Hack.) Wipff -- accepted
  Andropogon gerardii var. incanescens (Hack.) B. Boivin -- not accepted
  Andropogon glaucescens Schltdl. ex Hack. -- not accepted
  Andropogon glaucescens subvar. typicus Hack. -- not accepted
  Andropogon glaucescens var. brevis (Trin.) Hack. -- not accepted
  Andropogon glaucescens var. genuinus Hack. -- not accepted
  Andropogon glaucescens var. lateralis (Nees) Hack. -- not accepted
  Andropogon glaziovii Hack. -- accepted
  Andropogon glomeratus var. abbreviatus (Hack.) Scribn. -- not accepted
  Andropogon glomeratus var. corymbosus (Chapm. ex Hack.) Scribn. -- not accepted
  Andropogon glomeratus var. hirsutior (Hack.) C. Mohr -- accepted -- bushy bluestem
  Andropogon goyazensis Hack. -- not accepted
  Andropogon gracilior (Hack.) Nash ex Small -- not accepted
  Andropogon gracilipes Hack. -- not accepted
  Andropogon gyrans var. stenophyllus (Hack.) C.S. Campb. -- accepted -- Elliott's bluestem
  Andropogon halepensis var. effusus (Hack.) Stapf -- not accepted
  Andropogon halepensis var. muticus (Hack.) Asch. & Graebn. -- not accepted
  Andropogon hallii Hack. -- not accepted -- sand bluestem
  Andropogon hallii var. flaveolus Hack. -- not accepted
  Andropogon hallii var. incanescens Hack. -- not accepted
  Andropogon hallii var. muticus Hack. -- not accepted
  Andropogon hassleri Hack. -- not accepted
  Andropogon hassleri var. aristatus Hack. -- not accepted
  Andropogon herzogii Hack. -- not accepted
  Andropogon hirtiflorus var. feensis (E. Fourn.) Hack. -- not accepted
  Andropogon hirtiflorus var. genuinus Hack. -- not accepted
  Andropogon hirtiflorus var. oligostachyus (Chapm.) Hack. -- not accepted
  Andropogon hirtifolius var. pubiflorus (E. Fourn.) Hack. -- not accepted
  Andropogon hirtus var. podotrichus (Hochst.) Hack. -- not accepted
  Andropogon hypogynus Hack. -- accepted
  Andropogon hypogynus var. anatherus Hack. -- not accepted
  Andropogon hypogynus var. conjungens Hack. -- not accepted
  Andropogon hypogynus var. genuinus Hack. -- not accepted
  Andropogon hypogynus var. hypogynus Hack. -- not accepted
  Andropogon imberbis Hack. -- not accepted
  Andropogon imberbis var. genuinus Hack. -- not accepted
  Andropogon imberbis var. muticus Hack. -- not accepted
  Andropogon imperatoides (Hack.) Lillo -- not accepted
  Andropogon incanus Hack. -- not accepted
  Andropogon incanus subvar. cryptopus Hack. -- not accepted
  Andropogon incanus subvar. typicus Hack. -- not accepted
  Andropogon incanus var. bogotensis Hack. -- not accepted
  Andropogon incanus var. brevis (Trin.) Hack. -- not accepted
  Andropogon incanus var. lateralis (Nees) Hack. -- not accepted
  Andropogon incanus var. ramosissimus Hack. -- not accepted
  Andropogon incanus var. subtilior (Hack.) Hack. -- not accepted
  Andropogon incanus var. trichocoleus Hack. -- not accepted
  Andropogon ingratus Hack. -- accepted
  Andropogon intermedius subvar. perfossus Hack. -- not accepted
  Andropogon intermedius var. caucasicus (Trin.) Hack. -- not accepted
  Andropogon intermedius var. genuinus Hack. -- not accepted
  Andropogon intermedius var. punctatus (Roxb.) Hack. -- not accepted
  Andropogon ischaemum var. americanus Hack. -- not accepted
  Andropogon ischaemum var. genuinus Hack. -- not accepted
  Andropogon lateralis ssp. cryptopus (Hack.) A. Zanin -- accepted
  Andropogon lateralis var. bogotensis (Hack.) Henrard -- not accepted
  Andropogon lateralis var. brevis (Trin.) Hack. ex Henrard -- not accepted
  Andropogon lateralis var. incanus (Hack.) Henrard -- not accepted
  Andropogon lechleri Steud. ex Hack. -- not accepted
  Andropogon leptocladus Hack. -- not accepted
  Andropogon leptocladus f. simplex Hack. -- not accepted
  Andropogon leucostachyus ssp. selloanus Hack. -- not accepted
  Andropogon leucostachyus subvar. mas Hack. -- not accepted
  Andropogon leucostachyus subvar. typicus Hack. -- not accepted
  Andropogon leucostachyus var. selloanus Hack. -- not accepted
  Andropogon leucostachyus var. subvillosus Hack. -- not accepted
  Andropogon liebmannii Hack. -- accepted
  Andropogon liebmannii subvar. genuinus Hack. -- not accepted
  Andropogon liebmannii subvar. mohrii Hack. -- not accepted
  Andropogon liebmannii subvar. raripilis Hack. -- not accepted
  Andropogon liebmannii var. liebmannii Hack. -- accepted
  Andropogon lindmanii Hack. -- accepted
  Andropogon linnaeanus (Hack.) Scribn. & Kearney -- not accepted
  Andropogon longiberbis Hack. -- accepted -- hairy bluestem
  Andropogon macrolepis Hack. -- not accepted
  Andropogon macrourum var. abbreviatus Hack. -- not accepted
  Andropogon macrourum var. corymbosus Chapm. ex Hack. -- not accepted
  Andropogon macrourum var. genuinus Hack. -- not accepted
  Andropogon macrourum var. viridis Curtiss ex Hack. -- not accepted
  Andropogon macrourus var. abbreviatus Hack. -- not accepted
  Andropogon macrourus var. corymbosus Chapm. ex Hack. -- not accepted
  Andropogon macrourus var. genuinus Hack. -- not accepted
  Andropogon macrourus var. hirsutior Hack. -- not accepted
  Andropogon macrourus var. viridis Curtiss ex Hack. -- not accepted
  Andropogon mohrii (Hack.) Hack. ex Vasey -- not accepted -- Mohr's bluestem
  Andropogon mohrii Hack. ex B.D. Jacks. -- not accepted
  Andropogon nardus ssp. ceriferus (Hack.) Hack. -- not accepted
  Andropogon neesii subvar. gardeneri (Hack.) Hack. -- not accepted
  Andropogon neesii subvar. leianthus (Hack.) Hack. -- not accepted
  Andropogon neesii subvar. leiophyllus (Hack.) Hack. -- not accepted
  Andropogon neesii subvar. paraguayensis Hack. -- not accepted
  Andropogon neesii subvar. riedelianus (Hack.) Hack. -- not accepted
  Andropogon neesii subvar. selloanus (Hack.) Hack. -- not accepted
  Andropogon neesii subvar. typicus Hack. -- not accepted
  Andropogon neesii var. apogynus (Hack.) Hack. -- not accepted
  Andropogon neesii var. dactyloides (Hack.) Hack. -- not accepted
  Andropogon neesii var. genuinus Hack. -- not accepted
  Andropogon nutans subvar. elongatus Hack. -- not accepted
  Andropogon nutans subvar. fuliginosus Hack. -- not accepted
  Andropogon nutans subvar. neesii Hack. -- not accepted
  Andropogon nutans var. agrostoides (Speg.) Hack. -- not accepted
  Andropogon nutans var. albescens (Hack.) Hack. -- not accepted
  Andropogon nutans var. avenaceus (Michx.) Hack. -- not accepted
  Andropogon nutans var. burchellii Hack. -- not accepted
  Andropogon nutans var. contractus (Hack.) Hack. -- not accepted
  Andropogon nutans var. incompletus (J. Presl) Hack. -- not accepted
  Andropogon nutans var. linnaeanus (Hack.) Hack. -- not accepted
  Andropogon nutans var. pellitus (Hack.) Hack. -- not accepted
  Andropogon nutans var. scaberrimus (Nees) Hack. -- not accepted
  Andropogon nutans var. stipoides (Kunth) Hack. -- not accepted
  Andropogon nutans var. submuticus (Hack.) Hack. -- not accepted
  Andropogon palmeri (Hack.) Gould -- not accepted
  Andropogon paniculatus var. elongatus (Hack.) Hack. -- not accepted
  Andropogon pauciflorus (Chapm.) Hack. -- not accepted
  Andropogon pellitus (Hack.) Herter -- not accepted
  Andropogon pertusus subvar. trifoveolatus Hack. -- not accepted
  Andropogon pertusus var. capensis Hack. -- not accepted
  Andropogon pertusus var. decipiens Hack. -- not accepted
  Andropogon pertusus var. insculptus (Hochst. ex A. Rich.) Hack. -- not accepted
  Andropogon pertusus var. panormitanus (Parl.) Hack. -- not accepted
  Andropogon piptatherus Hack. -- not accepted
  Andropogon piptatherus var. palmeri Hack. -- not accepted
  Andropogon pohlianus Hack. -- accepted
  Andropogon provincialis subvar. furcatus (Muhl. ex Willd.) Hack. -- not accepted
  Andropogon provincialis subvar. lindheimeri Hack. -- not accepted
  Andropogon provincialis subvar. pycnanthus Hack. -- not accepted
  Andropogon riedelii var. genuinus Hack. -- not accepted
  Andropogon riedelii var. multirameus Hack. -- not accepted
  Andropogon rufus var. fulvicomus (Hochst. ex A. Rich.) Hack. -- not accepted
  Andropogon ruprechtii Hack. -- not accepted
  Andropogon saccharoides ssp. brasiliensis Hack. -- not accepted
  Andropogon saccharoides ssp. genuinus Hack. -- not accepted
  Andropogon saccharoides ssp. laguroides (DC.) Hack. -- not accepted
  Andropogon saccharoides ssp. leucopogon (Nees) Hack. -- not accepted
  Andropogon saccharoides subvar. argenteus (DC.) Hack. -- not accepted
  Andropogon saccharoides subvar. muticus Hack. -- not accepted
  Andropogon saccharoides subvar. palmeri (Hack.) Hack. -- not accepted
  Andropogon saccharoides subvar. paucirameus Hack. -- not accepted
  Andropogon saccharoides subvar. perforatus (Trin. ex E. Fourn.) Hack. -- not accepted
  Andropogon saccharoides subvar. typicus Hack. -- not accepted
  Andropogon saccharoides var. barbinodis (Lag.) Hack. -- not accepted
  Andropogon saccharoides var. erianthoides Hack. -- not accepted
  Andropogon saccharoides var. genuinus Hack. -- not accepted
  Andropogon saccharoides var. hassleri (Hack.) Ekman -- not accepted
  Andropogon saccharoides var. imperatoides Hack. -- not accepted
  Andropogon saccharoides var. laguroides (DC.) Hack. -- not accepted
  Andropogon saccharoides var. laguroides Hack. -- not accepted
  Andropogon saccharoides var. palmeri Hack. -- not accepted
  Andropogon saccharoides var. perforatus (Trin. ex E. Fourn.) Hack. ex L.H. Dewey -- not accepted
  Andropogon saccharoides var. submuticus Vasey ex Hack. -- not accepted
  Andropogon saccharoides var. torreyanus (Steud.) Hack. -- not accepted
  Andropogon salzmannii (Trin. ex Steud.) Hack. -- not accepted
  Andropogon salzmannii var. aristatus Hack. -- not accepted
  Andropogon scabriflorus Rupr. ex Hack. -- not accepted
  Andropogon schlumbergeri var. andreae Hack. -- not accepted
  Andropogon schoenanthus ssp. densiflorus (Steud.) Hack. -- not accepted
  Andropogon schoenanthus var. densiflorus (Steud.) Hack. -- not accepted
  Andropogon schottii Rupr. ex Hack. -- not accepted
  Andropogon schottii subvar. asperiglumis Hack. -- not accepted
  Andropogon schottii subvar. schottii Rupr. ex Hack. -- not accepted
  Andropogon schottii subvar. typicus Hack. -- not accepted
  Andropogon scoparius ssp. euscoparius Hack. ex Beal -- not accepted
  Andropogon scoparius ssp. genuinus Hack. -- not accepted
  Andropogon scoparius ssp. maritimus (Chapm.) Hack. -- not accepted
  Andropogon scoparius subvar. caesius Hack. -- not accepted
  Andropogon scoparius subvar. flexilis (Bosc ex Poir.) Hack. -- not accepted
  Andropogon scoparius subvar. lolioides (E. Fourn.) Hack. -- not accepted
  Andropogon scoparius subvar. serpentinus Hack. -- not accepted
  Andropogon scoparius subvar. simplicior Hack. -- not accepted
  Andropogon scoparius var. divergens Hack. -- not accepted
  Andropogon scoparius var. flexilis (Bosc ex Poir.) Hack. -- not accepted
  Andropogon scoparius var. maritimus Hack. ex L.H. Dewey -- not accepted
  Andropogon scoparius var. multirameus Hack. ex Gatt. -- not accepted
  Andropogon selloanus (Hack.) Hack. -- accepted
  Andropogon semiberbis subvar. leptostachyus (Benth.) Hack. -- not accepted
  Andropogon semiberbis subvar. pruinatus Hack. -- not accepted
  Andropogon semiberbis var. incertus Hack. -- not accepted
  Andropogon sorghum ssp. halepensis (L.) Hack. -- not accepted
  Andropogon sorghum subvar. genuinus Hack. -- not accepted
  Andropogon sorghum subvar. japonicus Hack. -- not accepted
  Andropogon sorghum subvar. leiocladus Hack. -- not accepted
  Andropogon sorghum subvar. muticus Hack. -- not accepted
  Andropogon sorghum subvar. trachycladus Hack. -- not accepted
  Andropogon sorghum var. bicarinatus Hack. -- not accepted
  Andropogon sorghum var. bicolor (L.) Hack. -- not accepted
  Andropogon sorghum var. corymbosus Hack. -- not accepted
  Andropogon sorghum var. drummondii (Nees ex Steud.) Hack. -- not accepted
  Andropogon sorghum var. durra (Forssk.) Hack. -- not accepted
  Andropogon sorghum var. effusus Hack. -- not accepted
  Andropogon sorghum var. halepensis (L.) Hack. -- not accepted
  Andropogon sorghum var. nervosus (Besser ex Schult.) Hack. -- not accepted
  Andropogon sorghum var. sativus Hack. -- not accepted
  Andropogon sorghum var. subglobosus Hack. -- not accepted
  Andropogon sorghum var. submuticus Hack. -- not accepted
  Andropogon sorghum var. virgatus Hack. -- not accepted
  Andropogon sorghum var. vulgaris (Pers.) Hack. -- not accepted
  Andropogon spathiflorus var. inermis (Steud.) Hack. -- not accepted
  Andropogon tener Curtiss ex Hack. -- not accepted
  Andropogon tener subvar. pilosus (Hack.) Hack. -- not accepted
  Andropogon tener subvar. scabriglumis Hack. -- not accepted
  Andropogon tener subvar. typicus Hack. -- not accepted
  Andropogon tener var. dubius (Nees) Hack. -- not accepted
  Andropogon tener var. filiformis (Nees) Hack. -- not accepted
  Andropogon tener var. genuinus Hack. -- not accepted
  Andropogon tener var. neesii (Trin.) Hack. -- not accepted
  Andropogon tener var. pilosus Hack. -- not accepted
  Andropogon ternarius var. cabanisii (Hack.) Fernald & Griscom -- not accepted -- splitbeard bluestem
  Andropogon ternatus ssp. genuinus Hack. -- not accepted
  Andropogon ternatus ssp. macrothrix (Trin.) Hack. -- not accepted
  Andropogon trichocladus Rupr. ex Hack. -- not accepted
  Andropogon trichospirus Hack. -- not accepted
  Andropogon unilateralis Hack. -- not accepted
  Andropogon villosus f. apogynus (Hack.) Henrard -- not accepted
  Andropogon villosus subvar. gardneri (Hack.) Henrard -- not accepted
  Andropogon villosus subvar. leianthus (Hack.) Ekman -- not accepted
  Andropogon villosus subvar. leiophyllus (Hack.) Henrard -- not accepted
  Andropogon villosus subvar. paraguayensis (Hack.) Henrard -- not accepted
  Andropogon villosus subvar. riedelianus (Hack.) Henrard -- not accepted
  Andropogon villosus subvar. selloanus (Hack.) Henrard -- not accepted
  Andropogon villosus var. dactyloides (Hack.) Hack. ex Henrard -- not accepted
  Andropogon villosus var. genuinus (Hack.) Ekman -- not accepted
  Andropogon virginicus f. hirsutior (Hack.) Fernald & Griscom -- not accepted
  Andropogon virginicus ssp. genuinus Hack. -- not accepted
  Andropogon virginicus ssp. leucostachyus (Kunth) Hack. -- not accepted
  Andropogon virginicus subvar. ditior Hack. -- not accepted
  Andropogon virginicus subvar. stenophyllus Hack. -- not accepted
  Andropogon virginicus var. abbreviatus (Hack.) Fernald & Griscom -- not accepted
  Andropogon virginicus var. corymbosus (Chapm. ex Hack.) Fernald & Griscom -- not accepted
  Andropogon virginicus var. dealbatus C. Mohr ex Hack. -- not accepted
  Andropogon virginicus var. glaucus Hack. -- accepted -- chalky bluestem
  Andropogon virginicus var. hirsutior (Hack.) Hitchc. -- not accepted
  Andropogon virginicus var. stenophyllus (Hack.) Fernald & Griscom -- not accepted
  Andropogon virginicus var. tetrastachyus (Elliott) Hack. -- not accepted
  Andropogon virginicus var. viridis Hack. -- not accepted
  Andropogon wrightii Hack. -- not accepted
  Anelytrum Hack. -- not accepted
  Anelytrum avenaceum Hack. -- not accepted
  Anisantha flabellata (Hack. ex Boiss.) Holub -- not accepted
  Anthephora cristata (Döll) Hack. -- not accepted
  Anthoxanthum juncifolium (Hack.) Veldkamp -- accepted
  Anthoxanthum pusillum (Hack. ex Dusén) Veldkamp -- accepted
  Aphanelytrum (Hack.) Hack. -- accepted
  Aphanelytrum decumbens Hack. ex Sodiro -- not accepted
  Aphanelytrum procumbens (Hack.) Hack. -- accepted
  Apluda mutica var. aristata (L.) Hack. ex Backer -- not accepted
  Apluda varia ssp. aristata (L.) Hack. -- not accepted
  Apluda varia ssp. mutica (L.) Hack. -- not accepted
  Apluda varia var. intermedia Hack. -- not accepted
  Arctophila mucronata Hack. ex Vasey -- not accepted
  Argillochloa dasyclada (Hack. ex Beal) W.A. Weber -- not accepted
  Aristida acuminata Hack. -- not accepted
  Aristida adscensionis f. modestina Hack. -- not accepted
  Aristida adscensionis subvar. condensata Hack. -- not accepted
  Aristida adscensionis subvar. densiflora Hack. -- not accepted
  Aristida adscensionis var. argentina Hack. -- not accepted
  Aristida adscensionis var. breviseta Hack. -- not accepted
  Aristida adscensionis var. condensata (Hack.) Henrard -- not accepted
  Aristida adscensionis var. laevis Hack. -- not accepted
  Aristida adscensionis var. mexicana Hack. ex Henrard -- not accepted
  Aristida adscensionis var. modesta Hack. -- not accepted
  Aristida adscensionis var. scabriflora Hack. -- not accepted
  Aristida cordobensis Hack. -- not accepted
  Aristida enodis Hack. -- not accepted
  Aristida friesii Hack. ex Henrard -- accepted
  Aristida glaziovii Hack. ex Henrard -- accepted
  Aristida hassleri Hack. -- accepted
  Aristida hassleri var. aculeolata Hack. -- not accepted
  Aristida inversa Hack. -- not accepted
  Aristida laevis var. argentina (Hack.) Henrard -- not accepted
  Aristida leptochaeta Hack. -- not accepted
  Aristida macrantha Hack. -- accepted
  Aristida macrophylla Hack. -- accepted
  Aristida multiramea Hack. -- accepted
  Aristida oligospira (Hack.) Henrard -- accepted
  Aristida pallens f. breviaristata Hack. -- not accepted
  Aristida pallens var. macrochaeta Hack. -- not accepted
  Aristida pallens var. tenuicula Hack. -- not accepted
  Aristida riparia var. oligospira Hack. -- not accepted
  Aristida spegazzinii f. colorata Hack. -- not accepted
  Aristida spegazzinii var. abbreviata Hack. -- not accepted
  Aristida spegazzinii var. genuina Hack. -- not accepted
  Aristida spegazzinii var. pallescens Hack. -- not accepted
  Aristida subinterrupta var. argentina (Hack.) Henrard -- not accepted
  Aristida venustula var. scabrifolia Hack. -- accepted
  Arthraxon breviaristatus Hack. -- not accepted
  Arthraxon ciliare ssp. langsdorffii (Trin.) Hack. -- not accepted
  Arthraxon ciliare ssp. nudus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon ciliare ssp. quartinianus (A. Rich.) Hack. -- not accepted
  Arthraxon ciliare ssp. submuticus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon ciliare ssp. vriesii (Büse) Hack. -- not accepted
  Arthraxon ciliare var. coloratus (Hochst.) Hack. -- not accepted
  Arthraxon ciliare var. cryptatherus Hack. -- not accepted
  Arthraxon ciliare var. gracilis (Kunth) Hack. -- not accepted
  Arthraxon ciliare var. quartinianus (A. Rich.) Hack. -- not accepted
  Arthraxon ciliaris ssp. langsdorffii (Trin.) Hack. -- not accepted
  Arthraxon ciliaris ssp. nudus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon ciliaris ssp. quartinianus (A. Rich.) Hack. -- not accepted
  Arthraxon ciliaris ssp. submuticus (Nees ex Steud.) Hack. -- not accepted
  Arthraxon ciliaris ssp. vriesii (Büse) Hack. -- not accepted
  Arthraxon ciliaris var. centrasiaticus (Griseb.) Hack. -- not accepted
  Arthraxon ciliaris var. coloratus (Hochst.) Hack. -- not accepted
  Arthraxon ciliaris var. cryptatherus Hack. -- not accepted
  Arthraxon ciliaris var. cryptatherus Hack. -- not accepted
  Arthraxon ciliaris var. genuinus Hack. -- not accepted
  Arthraxon ciliaris var. glabrescens Hack. -- not accepted
  Arthraxon ciliaris var. gracilis (Kunth) Hack. -- not accepted
  Arthraxon ciliaris var. hookeri Hack. -- not accepted
  Arthraxon ciliaris var. quartinianus (A. Rich.) Hack. -- not accepted
  Arthraxon cryptatherus (Hack.) Koidz. -- not accepted
  Arthraxon cuspidatus var. micans (Nees) Hack. -- not accepted
  Arthraxon hispidus var. cryptatherus (Hack.) Honda -- not accepted
  Arthraxon hispidus var. hookeri (Hack.) Honda -- not accepted
  Arthraxon hispidus var. japonicus (Regel) Hack. ex Mori -- not accepted
  Arthraxon hookeri (Hack.) Henrard -- not accepted
  Arthraxon langsdorffii var. cryptatherus (Hack.) Kom. -- not accepted
  Arthraxon quartinianus var. glabrescens (Hack.) Jain -- not accepted
  Arthropogon stipitatus Hack. -- not accepted
  Arthrostylidium effusum (Hack.) McClure -- not accepted
  Arthrostylidium pittieri Hack. -- not accepted
  Arthrostylidium queko (Goudot) Hack. -- not accepted
  Arundinaria burchellii (Munro) Hack. -- not accepted
  Arundinaria capillifolia (Griseb.) Hack. -- not accepted
  Arundinaria cubensis (Rupr.) Hack. -- not accepted
  Arundinaria effusa Hack. -- not accepted
  Arundinaria excelsa (Griseb.) Hack. -- not accepted
  Arundinaria fimbriata (Griseb.) Hack. -- not accepted
  Arundinaria glaziovii Hack. -- not accepted
  Arundinaria glaziovii var. glaziovii Hack. -- not accepted
  Arundinaria goyazensis Hack. -- not accepted
  Arundinaria haenkei (Rupr.) Hack. -- not accepted
  Arundinaria longiflora (Munro) Hack. -- not accepted
  Arundinaria maculata Hack. -- not accepted
  Arundinaria mirabile (hort. ex Burb.) Hack. -- not accepted
  Arundinaria multispicata (Pilg.) Hack. -- not accepted
  Arundinaria obtusata (Pilg.) Hack. -- not accepted
  Arundinaria pittieri (Hack.) E.G. Camus -- not accepted
  Arundinaria prestoei (Munro) Hack. -- not accepted
  Arundinaria pubescens (Rupr.) Hack. -- not accepted
  Arundinaria queko (Goudot) Hack. -- not accepted
  Arundinaria racemiflora (Steud.) Hack. -- not accepted
  Arundinaria ramosissima Hack. -- not accepted
  Arundinaria rhizantha Hack. -- not accepted
  Arundinaria setigera Hack. -- not accepted
  Arundinaria sodiroana Hack. -- not accepted
  Arundinaria ulei Hack. -- not accepted
  Arundinaria urbanii (Pilg.) Hack. -- not accepted
  Arundinella hispida (Humb. & Bonpl. ex Willd.) Hack. -- not accepted
  Atropis argentinensis Hack. -- not accepted
  Atropis argentinensis f. mendozina Hack. -- not accepted
  Atropis convoluta var. mendozina Hack. -- not accepted
  Atropis parviflora Hack. -- not accepted
  Atropis preslii Hack. -- not accepted
  Atropis preslii ssp. breviculmis Hack. -- not accepted
  Atropis preslii ssp. pusilla Hack. -- not accepted
  Aulonemia effusa (Hack.) McClure -- accepted
  Aulonemia glaziovii (Hack.) McClure -- accepted
  Aulonemia goyazensis (Hack.) McClure -- accepted
  Aulonemia ramosissima (Hack.) McClure -- accepted
  Aulonemia setigera (Hack.) McClure -- accepted
  Aulonemia sodiroana (Hack.) McClure -- not accepted
  Aulonemia ulei (Hack.) McClure & L.B. Sm. -- accepted
  Avena byzantina subvar. biaristata (Hack. ex Trab.) Maire & Weiller -- not accepted
  Avena byzantina var. biaristata (Hack. ex Trab.) Parodi -- accepted
  Avena macrantha (Hack.) Nevski -- not accepted
  Avena macrantha (Hack.) Malzev -- not accepted
  Avena montevidensis Hack. -- not accepted
  Avena sativa var. biaristata Hack. ex Trab. -- not accepted
  Avena sterilis subvar. biaristata (Hack. ex Trab.) Malzev -- not accepted
  Avena sterilis var. biaristata (Hack. ex Trab.) Thell. -- not accepted
  Axonopus herzogii (Hack.) Hitchc. -- accepted
  Axonopus longecilius (Hack.) Parodi -- not accepted
  Axonopus ulei (Hack.) Dedecca -- not accepted
  Axonopus uninodis (Hack.) G.A. Black -- accepted
  Baldomiria chloridiformis (Hack.) Herter -- not accepted
  Bambusa glaziovii Hack. -- not accepted
  Bambusa maculosa Hack. -- not accepted
  Bambusa munroi Hack. -- not accepted
  Bambusa pallescens (Döll) Hack. -- not accepted
  Bambusa paniculata (Munro) Hack. -- not accepted
  Bambusa spinosissima Hack. -- not accepted
  Bambusa tomentosa (Hack. & Lindm.) McClure -- not accepted
  Bifaria bifaria (Hack.) Kuntze -- not accepted
  Bifaria caudiculata (Hack.) Kuntze -- not accepted
  Bifaria elytrochaeta (Hack.) Kuntze -- not accepted
  Blepharidachne Hack. -- accepted -- desert grass, desertgrass
  Blepharidachne benthamiana (Hack. ex Kuntze) Hitchc. -- accepted
  Blepharidachne bigelovii (S. Watson) Hack. -- accepted -- Bigelow desertgrass, Bigelow's desertgrass
  Blepharidachne kingii (S. Watson) Hack. -- accepted -- King's desertgrass, King's eyelashgrass
  Bothriochloa barbinodis var. palmeri (Hack.) de Wet -- not accepted -- Palmer's cane bluestem
  Bothriochloa brasiliensis (Hack.) Henrard -- accepted
  Bothriochloa decipiens (Hack.) C.E. Hubb. -- accepted -- crown beardgrass
  Bothriochloa hassleri (Hack.) Henrard -- not accepted
  Bothriochloa hassleri (Hack.) Cabrera -- not accepted
  Bothriochloa imperatoides (Hack.) Herter -- accepted
  Bothriochloa palmeri (Hack.) Pilg. -- accepted
  Bothriochloa palmeri (Hack.) Gould -- not accepted
  Bothriochloa piptathera (Hack.) Gould -- not accepted
  Bothriochloa wrightii (Hack.) Henrard -- accepted -- Wright's beard grass, Wright's beardgrass
  Bouteloua erecta (Vasey & Hack.) Columbus -- accepted
  Bouteloua multiseta var. pallida Hack. -- not accepted
  Brachiaria arrecta (Hack. ex T. Durand & Schinz) Stent -- not accepted -- African signalgrass
  Brachiaria glabrinodis (Hack.) Henrard -- not accepted
  Brachiaria venezuelae (Hack.) Henrard -- not accepted
  Brachyelytrum procumbens Hack. -- not accepted
  Briza ambigua Hack. -- not accepted
  Briza calotheca (Trin.) Hack. -- not accepted
  Briza glomerata Kuntze & Hack. ex Kuntze -- not accepted
  Briza juergensii Hack. -- not accepted
  Briza monandra (Hack.) Pilg. -- not accepted
  Briza monandra var. monandra (Hack.) Pilg. -- not accepted
  Briza subaristata var. interrupta (Hack.) Roseng., B.R. Arrill. & Izag. -- not accepted
  Briza triloba f. pumila Hack. ex Kneuck. -- not accepted
  Briza triloba f. violascens Hack. -- not accepted
  Briza triloba var. interrupta Hack. -- not accepted
  Bromopsis condensata (Hack.) Holub -- not accepted
  Bromus araucanus var. obtusiflorus (Hack.) J.A. Cámara -- not accepted
  Bromus bolivianus Hack. ex Renvoize -- not accepted
  Bromus bolivianus Hack. ex Buchtien -- not accepted
  Bromus buchtienii Hack. -- not accepted
  Bromus condensatus Hack. -- accepted
  Bromus erectus var. condensatus (Hack.) Fiori -- not accepted
  Bromus flabellatus Hack. ex Boiss. -- not accepted
  Bromus japonicus var. porrectus Hack. -- not accepted
  Bromus macranthos var. dusenii Hack. ex Dusén -- not accepted
  Bromus obtusiflorus Hack. -- not accepted
  Bromus pannonicus Hack. -- not accepted
  Bromus patagonicus Hack. -- not accepted
  Bromus pellitus Hack. -- accepted
  Bromus unioloides f. chasmogama Hack. -- not accepted
  Bromus unioloides f. cleistogama Hack. -- not accepted
  Bromus unioloides subf. achalensis Hack. -- not accepted
  Bromus unioloides subvar. pubescens (Hack.) Kloos -- not accepted
  Bromus unioloides var. brevis (Nees ex Steud.) Hack. -- not accepted
  Bromus unioloides var. montanus Hack. -- not accepted
  Bromus unioloides var. pubescens Hack. -- not accepted
  Calamagrostis aculeolata (Hack.) Ohwi -- not accepted
  Calamagrostis aurea (Munro ex Wedd.) Hack. ex Sodiro -- accepted
  Calamagrostis boliviensis Hack. -- accepted
  Calamagrostis capitata Hack. -- not accepted
  Calamagrostis crassifolia Hack. ex Sodiro -- not accepted
  Calamagrostis eminens f. brevipila Hack. ex Stuck. -- not accepted
  Calamagrostis erythrostachya (E. Desv.) Hack. -- not accepted
  Calamagrostis halleriana var. langdorfii (Link) Hack. -- not accepted
  Calamagrostis hieronymi Hack. -- accepted
  Calamagrostis lilloi Hack. -- not accepted
  Calamagrostis lilloi f. grandiflora Hack. -- not accepted
  Calamagrostis lilloi f. lilloi Hack. -- not accepted
  Calamagrostis longearistata (Wedd.) Hack. ex Sodiro -- not accepted
  Calamagrostis longearistata var. longearistata (Wedd.) Hack. ex Sodiro -- not accepted
  Calamagrostis malamalensis Hack. -- accepted
  Calamagrostis montevidensis var. linearis Hack. -- not accepted
  Calamagrostis nardifolia (Griseb.) Hack. -- accepted
  Calamagrostis neglecta ssp. aculeolata (Hack.) T. Koyama -- not accepted
  Calamagrostis neglecta var. poaeoides (Steud.) Hack. -- not accepted
  Calamagrostis nitida Hack. -- not accepted
  Calamagrostis nivalis (Wedd.) Hack. ex Buchtien -- not accepted
  Calamagrostis pittieri Hack. -- accepted
  Calamagrostis pulvinata Hack. -- not accepted
  Calamagrostis rosea (Griseb.) Hack. -- accepted
  Calamagrostis rosea f. typica Hack. -- not accepted
  Calamagrostis rosea var. macrochaeta Hack. ex R.E. Fr. -- not accepted
  Calamagrostis rosea var. viridula Hack. -- not accepted
  Calamagrostis sclerantha Hack. -- accepted
  Calamagrostis spiciformis Hack. -- not accepted
  Calamagrostis spiciformis var. acutifolia Hack. ex Buchtien -- not accepted
  Calamagrostis spruceana (Wedd.) Hack. ex Sodiro -- accepted
  Calamagrostis stricta var. aculeolata Hack. -- not accepted
  Calamagrostis tarmensis var. macrochaeta (Hack. ex R.E. Fr.) Soreng -- accepted
  Calamagrostis urelytra Hack. -- not accepted
  Calamagrostis violacea (Wedd.) Hack. ex Buchtien -- accepted
  Calamagrostis violacea var. violacea (Wedd.) Hack. ex Buchtien -- accepted
  Calamovilfa (A. Gray) Hack. ex Scribn. & Southw. -- accepted -- sandreed
  Calamovilfa brevipilis (Torr.) Hack. ex Scribn. & Southw. -- accepted -- pine barren sandreed
  Calamovilfa brevipilis var. brevipilis (Torr.) Hack. ex Scribn. & Southw. -- not accepted
  Calamovilfa longifolia (Hook.) Hack. ex Scribn. & Southw. -- accepted -- prairie sandreed
  Calamovilfa longifolia var. longifolia (Hook.) Hack. ex Scribn. & Southw. -- accepted -- prairie sand-reed, prairie sandreed
  Cathestecum erectum Vasey & Hack. -- not accepted -- cathestecum, false grama
  Cenchrus abyssinicus (Hack.) Morrone -- accepted
  Cenchrus echinatus f. longispina Hack. -- not accepted
  Cenchrus longispinus (Hack.) Fernald -- accepted -- burgrass, field sandbur, innocent-weed, longspine sandbur, mat sandbur, sandbur
  Cenchrus pauciflorus var. longispinus (Hack.) Jansen & Wacht. -- not accepted
  Chaetochloa caespitosa (Hack. & Arechav.) Speg. -- not accepted
  Chaetochloa trichorhachis (Hack.) Hitchc. -- not accepted
  Chionochloa cheesemanii (Hack. ex Cheeseman) Zotov -- accepted
  Chloridopsis Hack. -- not accepted
  Chloris accumbens Hack. ex Arechav. -- not accepted
  Chloris argentina (Hack.) Lillo & Parodi -- not accepted
  Chloris argentinensis (Hack.) Lillo & Parodi -- not accepted
  Chloris bahiensis f. glabrescens Hack. -- not accepted
  Chloris brachyathera (Hack. ex Parodi) Herter -- not accepted
  Chloris calvescens Hack. -- not accepted
  Chloris capensis var. glabrescens (Hack.) Parodi -- not accepted
  Chloris ciliata f. breviseta Hack. -- accepted
  Chloris distichophylla var. acuminata (Trin.) Hack. -- not accepted
  Chloris distichophylla var. argentina Hack. -- not accepted
  Chloris distichophylla var. genuina Hack. -- not accepted
  Chloris glabrescens (Hack.) Roseng. & Izag. -- not accepted
  Chloris nigra Hack. -- not accepted
  Chloris radiata var. beyrichiana (Kunth) Hack. -- not accepted
  Chloris tetrastachys Hack. ex Hook. f. -- not accepted
  Chloris uliginosa Hack. -- not accepted
  Chloropsis Hack. ex Kuntze -- not accepted
  Chrysopogon nutans var. linnaeanus (Hack.) C. Mohr -- not accepted
  Chusquea bambusoides (Raddi) Hack. -- accepted
  Chusquea bambusoides ssp. oxylepis Hack. -- not accepted
  Chusquea bambusoides var. bambusoides (Raddi) Hack. -- accepted
  Chusquea discolor Hack. -- not accepted
  Chusquea juergensii Hack. -- accepted
  Chusquea maurofernandeziana Hack. ex E.G. Camus -- not accepted
  Chusquea mexicana Hack. -- not accepted
  Chusquea meyeriana var. patentissima (Hack.) E.G. Camus -- not accepted
  Chusquea oxylepis (Hack.) Ekman -- accepted
  Chusquea pinifolia var. heterophylla (Nees) Hack. -- not accepted
  Chusquea pittieri Hack. -- accepted
  Chusquea quitensis Hack. -- not accepted
  Chusquea quitensis var. patentissima Hack. -- not accepted
  Chusquea tonduzii Hack. -- accepted
  Chusquea urelytra Hack. -- accepted
  Chusquea virgata Hack. -- accepted
  Chusquea wettsteinii Hack. -- not accepted
  Cockaynea elymoides (Hack.) Zotov -- not accepted
  Coelorachis balansae (Hack.) A. Camus -- not accepted
  Coelorachis balansae (Hack.) Henrard -- not accepted
  Coelorachis selloana (Hack.) Henrard -- not accepted
  Coelorachis selloana (Hack.) A. Camus -- not accepted
  Coelorhachis balansae (Hack.) A. Camus -- not accepted
  Coelorhachis selloana (Hack.) A. Camus -- not accepted
  Colanthelia rhizantha (Hack.) McClure -- accepted
  Cortaderia longicauda Hack. -- not accepted
  Cortaderia modesta (Döll) Hack. ex Dusén -- accepted
  Cortaderia modesta f. ramosa Hack. -- not accepted
  Cortaderia pilosa (d'Urv.) Hack. -- accepted
  Cortaderia pilosa var. pilosa (d'Urv.) Hack. -- not accepted
  Cortaderia sodiroana Hack. -- not accepted
  Corynephorus canescens var. andinus Hack. ex Sodiro -- not accepted
  Cymbachne amplectens subvar. pohliana (Hack.) Roberty -- not accepted
  Cymbopogon diplandrus (Hack.) De Wild. -- not accepted
  Cymbopogon ruprechtii (Hack.) Hitchc. -- not accepted
  Cymbopogon ruprechtii (Hack.) Rendle -- not accepted
  Cymbopogon schoenanthus var. densiflorus (Hack.) Rendle -- not accepted
  Cynodon dactylon var. maritimus (Kunth) Hack. -- not accepted
  Dactyloctenium geminatum Hack. -- accepted
  Dactyloctenium germinatum Hack. -- not accepted -- Sudan crowfoot grass
  Danthonia bachmannii Hack. -- not accepted
  Danthonia breviseta Hack. -- accepted
  Danthonia cirrata Hack. & Arechav. -- accepted
  Danthonia cirrata var. melanathera Hack. -- not accepted
  Danthonia cirrhata Hack. & Arechav. -- not accepted
  Danthonia domingensis Hack. & Pilg. -- accepted
  Danthonia domingensis ssp. domingensis Hack. & Pilg. -- accepted
  Danthonia hieronymi (Kuntze) Hack. -- not accepted
  Danthonia macrophylla Hack. -- not accepted
  Danthonia melanathera (Hack.) Bernardello -- accepted
  Danthonia montevidensis Hack. & Arechav. -- accepted
  Dasyochloa pygmaea (Hack.) Caro -- not accepted
  Davyella Hack. -- not accepted
  Davyella colusana (Burtt Davy) Hack. -- not accepted
  Deschampsia juergensii (Hack.) Valencia -- not accepted
  Deschampsia littoralis var. rhenana (Gremli) Hack. -- not accepted
  Deschampsia setacea (Huds.) Hack. -- accepted
  Deyeuxia boliviensis (Hack.) Villav. -- not accepted
  Deyeuxia eminens f. brevipila (Hack. ex Stuck.) Türpe -- not accepted
  Deyeuxia hieronymi (Hack.) Türpe -- not accepted
  Deyeuxia malamalensis (Hack.) Parodi -- not accepted
  Deyeuxia pulvinata (Hack.) Türpe -- not accepted
  Deyeuxia sclerantha (Hack.) Rúgolo -- not accepted
  Deyeuxia spiciformis (Hack.) Türpe -- not accepted
  Dichanthelium caerulescens (Hack. ex Hitchc.) Correll -- not accepted
  Dichanthelium pantrichum (Hack.) Davidse -- not accepted
  Dichanthelium superatum (Hack.) Zuloaga -- accepted
  Dichanthium saccharoides subvar. paucirameus (Hack.) Roberty -- not accepted
  Dichelachne sciurea var. inaequiglumis Hack. ex Cheeseman -- not accepted
  Digitaria adusta var. leiantha (Hack.) Parodi -- not accepted
  Digitaria adusta var. leucotricha (Hack.) Parodi -- not accepted
  Digitaria aequiglumis (Hack. & Arechav.) Parodi -- accepted
  Digitaria aequiglumis var. aequiglumis (Hack. & Arechav.) Parodi -- accepted
  Digitaria corynotricha (Hack.) Henrard -- accepted
  Digitaria curvinervis (Hack.) Fernald -- accepted
  Digitaria eggersii (Hack.) Henrard -- accepted -- Eggers' crabgrass
  Digitaria enodis (Hack. ex Arechav.) Parodi -- accepted
  Digitaria fiebrigii (Hack.) A. Camus -- accepted
  Digitaria gerdesii (Hack.) Parodi -- accepted
  Digitaria leiantha (Hack.) Parodi -- accepted
  Digitaria leiantha var. leucotricha (Hack.) Henrard -- not accepted
  Digitaria myriostachya (Hack.) Henrard -- accepted
  Digitaria pittieri (Hack.) Henrard -- accepted
  Digitaria sejuncta (Hack. ex Pilg.) Henrard -- accepted
  Diplachne barbata Hack. -- not accepted
  Diplachne carinata (Griseb.) Hack. -- not accepted
  Diplachne chloridiformis Hack. -- not accepted
  Diplachne guatemalensis Hack. -- not accepted
  Diplachne latifolia (Griseb.) Hack. -- not accepted
  Diplachne mexicana (Scribn.) Hack. -- not accepted
  Diplachne virgata (J. Presl) Hack. -- not accepted
  Dissanthelium atropidiforme (Hack.) Soreng -- not accepted
  Dissanthelium atropidiforme var. atropidiforme (Hack.) Soreng -- not accepted
  Dissochondrus biflorus (Hbd.) Kuntze ex Hack. -- accepted -- Hawai'i false bristlegrass
  Distichlis laxiflora Hack. -- accepted
  Distichlis scoparia f. laxiflora (Hack.) Beetle -- not accepted
  Distichlis spicata var. mendocina (Phil.) Hack. -- accepted
  Echinochloa guadeloupensis (Hack.) Wiegand -- not accepted
  Echinochloa helodes (Hack.) Parodi -- accepted
  Echinochloa najada (Hack. & Arechav.) Parodi -- not accepted
  Echinochloa pyramidalis var. guadeloupensis (Hack.) Stehlé -- not accepted
  Eleusine tristachya f. latifolia Hack. -- not accepted
  Elionurus adustus var. calvescens (Hack.) Hicken -- not accepted
  Elionurus argenteus var. caespitosus (A. Rich.) Hack. -- not accepted
  Elionurus argenteus var. genuinus Hack. -- not accepted
  Elionurus barbiculmis Hack. -- accepted -- woolspike balsamscale, wooly bunchgrass, woolyspike balsamscale
  Elionurus barbiculmis var. barbiculmis Hack. -- not accepted
  Elionurus bilinguis (Trin.) Hack. -- accepted
  Elionurus candidus (Trin.) Hack. -- not accepted
  Elionurus candidus var. barbiculmis (Hack.) Roberty -- not accepted
  Elionurus candidus var. bisetosis Hack. & Lindm. -- not accepted
  Elionurus candidus var. candidus (Trin.) Hack. -- not accepted
  Elionurus candidus var. lividus (Hack.) Roberty -- not accepted
  Elionurus latiflorus (Nees ex Steud.) Hack. -- not accepted
  Elionurus latiflorus var. adustus (Trin.) Hack. -- not accepted
  Elionurus latiflorus var. calvescens Hack. -- not accepted
  Elionurus latiflorus var. genuinus Hack. -- not accepted
  Elionurus latiflorus var. gracilescens Hack. -- not accepted
  Elionurus latiflorus var. latiflorus (Nees ex Steud.) Hack. -- not accepted
  Elionurus latiflorus var. pectinatus Hack. -- not accepted
  Elionurus lividus Hack. -- accepted
  Elionurus muticus var. barbiculmis (Hack.) Beetle -- not accepted
  Elionurus muticus var. calvescens (Hack.) Hack. ex Kunze -- not accepted
  Elionurus muticus var. gracilescens (Hack.) Hack. ex Kuntze -- not accepted
  Elionurus tripsacoides subvar. brevidentatus (Hack.) Roberty -- not accepted
  Elionurus tripsacoides subvar. sericeus (Hack.) Roberty -- not accepted
  Elionurus tripsacoides var. brevidentatus Hack. -- not accepted
  Elionurus tripsacoides var. ciliaris (Kunth) Hack. -- not accepted
  Elionurus tripsacoides var. genuinus Hack. -- not accepted
  Elionurus tripsacoides var. sericeus Hack. -- not accepted
  Elionurus viridulus Hack. -- not accepted
  Elymus scabriglumis (Hack.) Á. Löve -- accepted
  Elyonurus barbiculmis Hack. -- not accepted
  Elyonurus barbiculmus Hack. -- not accepted
  Elyonurus candidus (Trin.) Hack. -- not accepted
  Elyonurus candidus var. bisetosus Hack. & Lindm. -- not accepted
  Elyonurus candidus var. candidus (Trin.) Hack. -- not accepted
  Elyonurus latiflorus (Nees ex Steud.) Hack. -- not accepted
  Elyonurus muticus var. barbiculmis (Hack.) Beetle -- not accepted
  Elyonurus tripsacoides var. ciliaris (Kunth) Hack. -- not accepted
  Elyonurus tripsacoides var. sericeus Hack. -- not accepted
  Elytrigia scabriglumis (Hack.) Covas ex J.H. Hunz. & Xifreda -- not accepted
  Epicampes arundinacea (Griseb.) Hack. -- not accepted
  Epicampes coerulea var. submutica Hack. -- not accepted
  Eragrostis brachypodon Hack. -- not accepted
  Eragrostis buchtienii Hack. -- not accepted
  Eragrostis damiensiana var. condensata (Hack.) Thell. -- not accepted
  Eragrostis densissima Hack. -- not accepted
  Eragrostis distans Hack. -- not accepted
  Eragrostis elatior Hack. -- not accepted
  Eragrostis lindmanii Hack. -- not accepted
  Eragrostis longipila Hack. -- not accepted
  Eragrostis lugens f. pallida Hack. -- not accepted
  Eragrostis lugens ssp. flaccida (Lindm.) Hack. -- not accepted
  Eragrostis macrothyrsa Hack. -- accepted
  Eragrostis monandra Hack. -- not accepted
  Eragrostis neesii var. lindmanii (Hack.) Ekman -- accepted
  Eragrostis orthoclada Hack. -- accepted
  Eragrostis pilosa var. condensata Hack. -- not accepted
  Eragrostis pilosa var. delicatula (Trin.) Hack. -- not accepted
  Eragrostis retinens Hack. & Arechav. -- accepted
  Eragrostis rojasii Hack. -- accepted
  Eragrostis trichocolea Hack. & Arechav. -- not accepted -- hairysheath lovegrass
  Eragrostis trichocolea var. trichocolea Hack. & Arechav. -- not accepted -- hairysheath lovegrass
  Eragrostis virescens var. trachyphylla Hack. -- not accepted
  Eragrostis warmingii Hack. -- not accepted
  Eremochloa ophiuroides (Munro) Hack. -- accepted -- centipede grass
  Erianthus asper var. brasilianus (Trin.) Hack. -- not accepted
  Erianthus asper var. typicus Hack. -- not accepted
  Erianthus balansae Hack. -- not accepted
  Erianthus biaristatus (Hack.) Swallen -- not accepted
  Erianthus divaricatus var. angustifolius (Nees) Hack. -- not accepted
  Erianthus glabrinodis (Hack.) Swallen -- not accepted
  Erianthus ravennae var. jamaicensis (Trin.) Hack. -- not accepted
  Erianthus ravennae var. purpurascens (Andersson) Hack. -- not accepted
  Erianthus saccharoides ssp. angustifolius (Nees) Hack. -- not accepted
  Erianthus saccharoides ssp. biaristatus (Hack.) Hack. -- not accepted
  Erianthus saccharoides ssp. contortus (Elliott) Hack. -- not accepted
  Erianthus saccharoides subvar. glabrinodis Hack. -- not accepted
  Erianthus saccharoides subvar. villosus (Steud.) Hack. -- not accepted
  Erianthus saccharoides var. biaristatus Hack. -- not accepted
  Erianthus saccharoides var. brevibarbis (Michx.) Hack. -- not accepted
  Erianthus saccharoides var. michauxii Hack. -- not accepted
  Erianthus saccharoides var. neesii Hack. -- not accepted
  Erianthus saccharoides var. trinii Hack. -- not accepted
  Erianthus trinii (Hack.) Hack. -- not accepted
  Erianthus trinii subvar. glabrinodis (Hack.) Hack. -- not accepted
  Erianthus trinii subvar. trinii (Hack.) Hack. -- not accepted
  Erianthus trinii subvar. villosus (Steud.) Hack. -- not accepted
  Erianthus trinii var. glabrinodis (Hack.) Hack. -- not accepted
  Erianthus trinii var. trinii (Hack.) Hack. -- not accepted
  Erianthus trinii var. villosus (Steud.) Hack. -- not accepted
  Eriochloa acrotricha (Steud.) Hack. -- not accepted
  Eriochloa castanea Hack. -- not accepted
  Eriochloa leersioides (Munro) Hack. -- not accepted -- sharp cupgrass
  Eriochloa montevidensis f. subcolorata Hack. -- not accepted
  Eriochloa nubica (Steud.) Hack. & Stapf ex Thell. -- not accepted
  Eriochloa procera var. involucrata (Hack.) Jansen -- not accepted
  Eriochloa ramosa var. involucrata Hack. -- not accepted
  Eriochrysis filiformis (Hack.) Filg. -- accepted
  Eriochrysis warmingiana (Hack.) Pilg. -- not accepted
  Eriochrysis warmingiana (Hack.) Kuhlm. -- accepted
  Erioneuron avenaceum var. pygmaeum (Hack.) Anton -- accepted
  Eustachys argentina (Hack.) Herter -- not accepted
  Eustachys argentinensis (Hack.) Herter -- not accepted
  Eustachys calvescens (Hack.) Caro & E.A. Sánchez -- accepted
  Eustachys glabrescens (Hack.) Caro & E.A. Sánchez -- not accepted
  Eustachys ulignosa (Hack.) Herter -- accepted
  Festuca amethystina var. asperrima Hack. ex Beal -- not accepted
  Festuca binodis (Hack. ex St.-Yves) Lillo -- not accepted
  Festuca buchtienii Hack. -- not accepted
  Festuca calchaquiensis Hack. -- not accepted
  Festuca cinerea var. trachyphylla (Hack.) Stohr -- not accepted
  Festuca dasyclada Hack. ex Beal -- accepted -- oil shale fescue
  Festuca densiuscula (Hack. ex Piper) E.B. Alexeev -- not accepted
  Festuca duriuscula ssp. trachyphylla (Hack.) Rohlena -- not accepted
  Festuca duriuscula var. trachyphylla (Hack.) Richter -- not accepted
  Festuca elatior ssp. arundinacea (Schreb.) Hack. -- not accepted
  Festuca elatior ssp. pratensis (Huds.) Hack. -- not accepted
  Festuca elliotii Hack. -- not accepted
  Festuca elmeri var. conferta (Hack. ex Beal) Hitchc. -- not accepted
  Festuca eriostoma Hack. -- accepted
  Festuca flacca Hack. ex E.B. Alexeev -- accepted
  Festuca flacca Hack. ex Sodiro -- not accepted
  Festuca glumosa Hack. ex Sodiro -- not accepted
  Festuca glumosa Hack. ex E.B. Alexeev -- accepted
  Festuca hieronymi Hack. -- accepted
  Festuca hieronymi subvar. hieronymi Hack. -- not accepted
  Festuca hieronymi var. hieronymi Hack. -- accepted
  Festuca howellii Hack. ex Beal -- not accepted -- Howell's fescue
  Festuca hystricola (Hack.) E.B. Alexeev -- not accepted
  Festuca idahoensis var. oregona (Hack. ex Beal) C.L. Hitchc. -- not accepted
  Festuca ingrata (Hack. ex Beal) Rydb. -- not accepted
  Festuca ingrata var. ingrata (Hack. ex Beal) Rydb. -- not accepted
  Festuca jonesii var. conferta Hack. ex Beal -- not accepted
  Festuca leioclada Hack. ex Sodiro -- not accepted
  Festuca lilloi Hack. -- accepted
  Festuca lilloi var. lilloi Hack. -- not accepted
  Festuca longifolia var. trachyphylla (Hack.) Howarth -- not accepted
  Festuca mediterranea (Hack.) Rouy -- not accepted
  Festuca megalura var. hirsuta (Hack.) Aschers. & Graebn. -- not accepted
  Festuca myuros var. hirsuta (Hack.) Asch. & Graebn. -- not accepted
  Festuca nardifolia var. calchaquiensis (Hack.) St.-Yves -- accepted
  Festuca occidentalis var. ingrata (Hack. ex Beal) B. Boivin -- not accepted
  Festuca occidentalis var. oregona (Hack. ex Beal) B. Boivin -- not accepted
  Festuca orientalis (Hack.) V.I. Krecz. & Bobrov -- not accepted
  Festuca orthophylla var. eriostoma (Hack.) St.-Yves -- not accepted
  Festuca ovina ssp. brevifolia (S. Watson) Hack. -- not accepted
  Festuca ovina ssp. glauca (Lam.) Hack. ex Hegi -- not accepted
  Festuca ovina ssp. hystricola Hack. -- not accepted
  Festuca ovina subvar. guestfalica (Boenn. ex Reichb.) Hack. -- not accepted
  Festuca ovina subvar. trachyphylla Hack. -- not accepted
  Festuca ovina subvar. trachyphylla (Hack.) Maire -- not accepted
  Festuca ovina subvar. vivipara (L.) Hack. -- not accepted
  Festuca ovina var. antarctica Hack. -- not accepted
  Festuca ovina var. arizonica (Vasey) Hack. ex Beal -- not accepted
  Festuca ovina var. capillata (Lam.) Hack. -- not accepted
  Festuca ovina var. duriuscula (L.) Hack. -- not accepted
  Festuca ovina var. glauca (Lam.) Hack. -- not accepted
  Festuca ovina var. hystricola Hack. -- not accepted
  Festuca ovina var. ingrata Hack. ex Beal -- not accepted
  Festuca ovina var. magellanica (Lam.) Hack. -- not accepted
  Festuca ovina var. oregona Hack. ex Beal -- not accepted
  Festuca ovina var. pyrogea (Speg.) Hack. -- not accepted
  Festuca ovina var. supina (Schur) Hack. -- accepted
  Festuca ovina var. trachyphylla (Hack.) Druce -- not accepted
  Festuca rubra f. arctica Hack. -- not accepted
  Festuca rubra f. vivipara Hack. -- not accepted
  Festuca rubra ssp. arctica (Hack.) Govor. -- accepted -- red fescue
  Festuca rubra ssp. densiuscula Hack. ex Piper -- not accepted
  Festuca rubra ssp. heterophylla (Lam.) Hack. -- not accepted
  Festuca rubra ssp. juncea (Hack.) Soó -- not accepted
  Festuca rubra ssp. juncea (Hack.) K. Richt. -- accepted
  Festuca rubra ssp. pruinosa (Hack.) Piper -- accepted -- red fescue
  Festuca rubra subvar. arenaria (Osbeck) Hack. -- not accepted
  Festuca rubra subvar. densiuscula (Hack. ex Piper) St.-Yves -- not accepted
  Festuca rubra subvar. glaucescens Hack. -- not accepted
  Festuca rubra subvar. juncea Hack. -- not accepted
  Festuca rubra subvar. pruinosa Hack. -- not accepted
  Festuca rubra var. densiuscula (Hack. ex Piper) Hitchc. -- not accepted
  Festuca rubra var. dijimilensis Hack. ex Boiss. -- not accepted
  Festuca rubra var. fallax (Thuill.) Hack. -- not accepted
  Festuca rubra var. juncea (Hack.) P. Fourn. -- not accepted
  Festuca rubra var. simpliciuscula Hack. -- not accepted
  Festuca scabrella var. asperrima Hack. -- not accepted
  Festuca scabrella var. vaseyana Hack. ex Beal -- not accepted
  Festuca scirpifolia ssp. buchtienii (Hack.) St.-Yves -- not accepted
  Festuca setifolia var. lilloi (Hack.) St.-Yves -- not accepted
  Festuca simpliciuscula (Hack.) E.B. Alexeev -- accepted
  Festuca sodiroana Hack. ex E.B. Alexeev -- accepted
  Festuca sodiroana Hack. ex Sodiro -- not accepted
  Festuca stricta ssp. trachyphylla (Hack.) Patzke -- not accepted
  Festuca stricta ssp. trachyphylla (Hack.) Patzke ex Pilz -- not accepted
  Festuca trachylepis Hack. ex Druce -- not accepted
  Festuca trachyphylla (Hack.) Krajina -- accepted -- hard fescue
  Festuca uninodis Hack. -- accepted
  Festuca uninodis f. binodis Hack. ex St.-Yves -- not accepted
  Festuca uninodis f. uninodis Hack. -- not accepted
  Festuca vaseyana Hack. ex Beal -- not accepted
  Festuca viridula var. howellii (Hack. ex Beal) St.-Yves -- not accepted
  Gouinia barbata (Hack.) Swallen -- accepted
  Gouinia guatemalensis (Hack.) Swallen -- not accepted
  Gouinia latifolia var. guatemalensis (Hack.) J.J. Ortíz -- accepted
  Guadua glaziovii (Hack.) E.G. Camus -- not accepted
  Guadua maculosa (Hack.) E.G. Camus -- accepted
  Guadua spinosissima (Hack.) E.G. Camus -- not accepted
  Guadua tagoara ssp. glaziovii (Hack.) Londońo & L.G. Clark -- accepted
  Guadua tomentosa Hack. & Lindm. -- not accepted
  Gymnopogon brevisetus (Hack.) J.P. Smith -- not accepted
  Gymnopogon muticus Hack. -- not accepted
  Gymnopogon spicatus var. brevisetus Hack. -- not accepted
  Gynerium ramosum Hack. -- not accepted
  Hackelochloa porifera (Hack.) D. Rhind -- not accepted
  Hemimunroa andina var. breviseta (Hack.) Parodi -- not accepted
  Heteropogon contortus var. glaber (Pers.) Hack. -- not accepted
  Heteropogon contortus var. hirtus (J. Presl) Fenzl ex Hack. -- not accepted
  Heteropogon leptocladus (Hack.) Parodi -- not accepted
  Heteropogon leptocladus (Hack.) Roberty -- not accepted
  Heteropogon leptocladus var. leptocladus (Hack.) Roberty -- not accepted
  Heteropogon villosus subvar. gardneri Hack. -- not accepted
  Heteropogon villosus subvar. leianthus Hack. -- not accepted
  Heteropogon villosus subvar. leiophyllus Hack. -- not accepted
  Heteropogon villosus subvar. riedelianus Hack. -- not accepted
  Heteropogon villosus subvar. selloanus Hack. -- not accepted
  Heteropogon villosus subvar. typicus Hack. -- not accepted
  Heteropogon villosus var. apogynus Hack. -- not accepted
  Heteropogon villosus var. dactyloides Hack. -- not accepted
  Heteropogon villosus var. genuinus Hack. -- not accepted
  Hierochloe juncifolia (Hack.) Parodi -- not accepted
  Hierochloe pusilla Hack. ex Dusén -- not accepted
  Hierochloe utriculata var. juncifolia Hack. -- not accepted
  Holcus nutans var. avenaceus (Michx.) Hack. -- not accepted
  Holcus saccharoides var. barbinodis (Lag.) Hack. -- not accepted
  Holcus saccharoides var. laguroides (DC.) Hack. -- not accepted
  Holcus saccharoides var. perforatus (Trin. ex E. Fourn.) Hack. -- not accepted
  Holcus trichocladus (Rupr. ex Hack.) Nash -- not accepted
  Holcus virgatus (Hack.) Bailey -- not accepted
  Hordeum compressum var. superatum Hack. -- not accepted
  Hordeum compressum var. tenuispicatum Hack. -- not accepted
  Hordeum muticum var. superatum (Hack.) Thell. -- not accepted
  Hordeum nodosum var. parviflorum (Hack.) Henrard & Thell. -- not accepted
  Hordeum secalinum var. parviflorum Hack. -- not accepted
  Hordeum stenostachys var. superatum (Hack.) Thell. ex Stuck. -- not accepted
  Hyparrhenia diplandra (Hack.) Stapf -- accepted
  Hyparrhenia macrolepis (Hack.) Stapf -- not accepted
  Hyparrhenia ruprechtii (Hack.) E. Fourn. -- not accepted
  Hyperthelia macrolepis (Hack.) Clayton -- not accepted
  Ichnanthus damazianus Hack. -- not accepted
  Ichnanthus lilloi Hack. -- not accepted
  Ichnanthus procurrens var. subaequiglumis (Hack.) Killeen & Kirpes -- accepted
  Ichnanthus sericans Hack. -- not accepted
  Imperata arundinacea var. condensata (Steud.) Hack. -- not accepted
  Imperata cylindrica var. condensata (Steud.) Hack. -- not accepted
  Imperata exaltata var. angustifolia Hack. -- not accepted
  Imperata exaltata var. caudata (G. Mey.) Hack. -- not accepted
  Imperata hookeri (Rupr. ex Andersson) Rupr. ex Hack. -- not accepted
  Imperata minutiflora Hack. -- accepted
  Imperata tenuis Hack. -- accepted
  Ischaemum angustifolium (Trin.) Hack. -- not accepted
  Ischaemum aureum (Hook. & Arn.) Hack. -- accepted -- golden duckbeakgrass
  Ischaemum chordatum (Trin.) Hack. ex Warb. -- accepted -- ischaemum
  Ischaemum ciliare var. villosum (Nees) Hack. -- not accepted
  Ischaemum guianense Kunth ex Hack. -- accepted
  Ischaemum guianense var. schomburgkii Hack. -- not accepted
  Ischaemum latifolium var. oligostachyum Hack. -- not accepted
  Jarava illimanica (Hack.) F. Rojas -- accepted
  Jarava polyclada (Hack.) Peńailillo -- accepted
  Koeleria kurtzii Hack. ex Kurtz -- accepted
  Koeleria kurtzii var. mollis Hack. -- not accepted
  Koeleria lilloi Hack. -- not accepted
  Lachnagrostis sodiroana (Hack.) Rúgolo & A.M. Molina -- accepted
  Lasiacis procerrima (Hack.) Hitchc. -- accepted
  Leptochloa carinata Hack. -- not accepted
  Leptochloa chloridiformis (Hack.) Parodi -- accepted -- Argentine sprangletop
  Leptochloa perennis Hack. -- not accepted
  Leptochloa virgata var. puberula Hack. -- accepted
  Leptopogon carinatus subvar. incanus (Hack.) Roberty -- not accepted
  Leptopogon carinatus subvar. ramosissimus (Hack.) Roberty -- not accepted
  Leptopogon carinatus subvar. subtilior (Hack.) Roberty -- not accepted
  Leptopogon carinatus subvar. trichocoleus (Hack.) Roberty -- not accepted
  Leptopogon flaveolus (Hack.) Roberty -- not accepted
  Leptosaccharum (Hack.) A. Camus -- not accepted
  Leptosaccharum filiforme (Hack.) A. Camus -- not accepted
  Luziola contracta Hack. -- not accepted
  Macrochloa gigantea (Link) Hack. -- not accepted
  Manisuris balansae (Hack.) Parodi -- not accepted
  Manisuris chapmanii (Hack.) Nash -- not accepted
  Manisuris corrugata var. areolata (Hack.) C. Mohr -- not accepted
  Manisuris porifera Hack. -- not accepted
  Manisuris rugosa var. chapmanii (Hack.) Scribn. -- not accepted
  Manisuris selloana (Hack.) Kuntze -- not accepted
  Manisuris tessellata var. areolata (Hack.) Scribn. -- not accepted
  Melica adhaerens Hack. -- not accepted
  Melica adhaerens var. adhaerens Hack. -- not accepted
  Melica argyrea Hack. -- accepted
  Melica argyrea var. argyrea Hack. -- not accepted
  Melica aurantiaca f. violacea Hack. ex Papp -- not accepted
  Melica cordobensis Hack. -- not accepted
  Melica laxiflora f. macrior Hack. -- not accepted
  Melica papilionacea var. hyalina (Döll) Hack. ex Kneuck. -- not accepted
  Melica pyrifera Hack. -- not accepted
  Melica stuckertii Hack. -- accepted
  Melica stuckertii f. stuckertii Hack. -- not accepted
  Melica stuckertii var. cordobensis (Hack.) Hack. -- not accepted
  Melica stuckertii var. stuckertii Hack. -- not accepted
  Melica tenuis Hack. & Arechav. -- accepted
  Melinis rosea (Nees) Hack. -- not accepted
  Merostachys multiramea Hack. -- accepted
  Mesosetum bifarium (Hack.) Chase -- accepted
  Mesosetum caudiculatum (Hack.) Swallen -- not accepted
  Mesosetum elytrochaetum (Hack.) Swallen -- accepted
  Microchloa indica (L. f.) Hack. -- not accepted
  Microchloa indica var. tenuis Hack. & Stuck. -- accepted
  Miscanthus nepalensis (Trin.) Hack. -- accepted -- Nepalese silvergrass
  Miscanthus saccariflorus (Maxim.) Hack. -- not accepted
  Miscanthus sacchariflorus (Maxim.) Hack. -- accepted -- Amur silvergrass
  Miscanthus sinensis ssp. condensatus (Hack.) T. Koyama -- accepted -- Purple Japanese silver grass
  Mnesithea balansae (Hack.) de Koning & Sosef -- accepted
  Mnesithea selloana (Hack.) de Koning & Sosef -- accepted
  Mnesithea subgibbosa (Winkl. ex Hack.) de Koning & Sosef -- accepted
  Molineria laevis (Brot.) Hack. -- not accepted
  Muhlenbergia breviaristata (Hack.) Parodi -- accepted
  Muhlenbergia ligularis (Hack.) Hitchc. -- accepted
  Muhlenbergia peruviana var. breviaristata Hack. ex Buchtien -- not accepted
  Muhlenbergia phragmitoides var. breviaristata Hack. -- not accepted
  Muhlenbergia polypogonoides Hack. -- not accepted
  Muhlenbergia schmitzii Hack. -- accepted
  Muhlenbergia trifida Hack. -- not accepted
  Munroa andina var. breviseta Hack. -- not accepted
  Munroa benthamiana Hack. ex Kuntze -- not accepted
  Nassella caespitosa var. peruviana (Ball) Hack. ex Druce -- not accepted
  Nassella corniculata Hack. -- not accepted
  Nassella deltoidea Hack. -- not accepted
  Nassella flaccidula Hack. -- not accepted
  Nassella flaccidula var. flaccidula Hack. -- not accepted
  Nassella flaccidula var. humilior Hack. -- not accepted
  Nassella juergensii (Hack.) Barkworth -- accepted
  Nassella nutans (Hack.) Barkworth -- accepted
  Nassella pubiflora var. humilior (Hack.) Torres -- accepted
  Nassella stuckertii (Hack.) Barkworth -- accepted
  Nassella tenuiculmis (Hack.) Peńailillo -- accepted
  Nassella trichotoma (Nees) Hack. ex Arechav. -- accepted -- serrated tussock, serrated tussock grass
  Nicoraepoa subenervis (Hack.) Soreng & L.J. Gillespie -- accepted
  Nicoraepoa subenervis ssp. subenervis (Hack.) Soreng & L.J. Gillespie -- accepted
  Olyra buchtienii Hack. -- accepted
  Olyra pittieri Hack. -- not accepted
  Olyra semiovata var. humilis (Nees) Hack. -- not accepted
  Olyra semiovata var. pubescens Hack. -- not accepted
  Olyra semiovata var. pubiflora Hack. -- not accepted
  Oplismenopsis najada (Hack. & Arechav.) Parodi -- accepted
  Oplismenus compositus var. loliaceus (Lam.) Hack. -- not accepted
  Oplismenus najada (Hack. & Arechav.) Parodi -- not accepted
  Oryzopsis coerulescens (Desf.) Hack. -- not accepted
  Oryzopsis holciformis (M. Bieb.) Hack. -- accepted -- ricegrass
  Otachyrium seminudum Hack. ex Send. & Soderstr. -- accepted
  Panicum adustum var. leianthum Hack. -- not accepted
  Panicum adustum var. leucotrichum Hack. -- not accepted
  Panicum adustum var. phaeothrix (Trin.) Hack. -- not accepted
  Panicum aegyptiacum var. blepharanthum (Hack. ex T. Durand & Schinz) Chiov. -- not accepted
  Panicum aequiglume Hack. & Arechav. -- not accepted
  Panicum aequiglume var. aequiglume Hack. & Arechav. -- not accepted
  Panicum arrectum Hack. ex T. Durand & Schinz -- not accepted
  Panicum bergii var. leiophyllum Hack. & Lindm. -- not accepted
  Panicum bifarium Hack. -- not accepted
  Panicum boliviense Hack. -- not accepted -- Bolivian panicgrass
  Panicum caerulescens Hack. ex Hitchc. -- not accepted
  Panicum campylostachyum Hack. -- not accepted
  Panicum caudiculatum Hack. -- not accepted
  Panicum corynotrichum Hack. -- not accepted
  Panicum costaricense Hack. -- not accepted
  Panicum curvinerve Hack. -- not accepted
  Panicum debile var. aequiglume (Hack. & Arechav.) Hack. -- not accepted
  Panicum divaricatum var. agglutinans (Kunth) Hack. ex Sodiro -- not accepted
  Panicum dusenii Hack. -- not accepted
  Panicum eggersii Hack. -- not accepted
  Panicum elytrochaetum Hack. -- not accepted
  Panicum fiebrigii Hack. -- not accepted
  Panicum fluminense Hack. -- not accepted
  Panicum friesii Hack. ex R.E. Fr. -- not accepted
  Panicum fultum Hack. -- not accepted
  Panicum gerdesii Hack. -- not accepted
  Panicum gerdesii f. pleostachya Hack. -- not accepted
  Panicum glabrinode Hack. -- not accepted
  Panicum glaziovii Hack. -- not accepted
  Panicum gracilipes Hack. -- not accepted
  Panicum gracilipes var. pubiflorum Hack. -- not accepted
  Panicum helodes (Hack.) Hauman -- not accepted
  Panicum herzogii Hack. -- not accepted
  Panicum insulare var. penicilligerum (Speg.) Hack. -- not accepted
  Panicum insulare var. sacchariflorum (Nees) Hack. -- not accepted
  Panicum insulare var. tenerrimum (Kunth) Hack. -- not accepted
  Panicum insulare var. typicum Hack. -- not accepted
  Panicum juergensii Hack. -- not accepted
  Panicum jurgensenii Hack. -- not accepted
  Panicum laevifolium Hack. -- accepted
  Panicum laxum f. minor Hack. -- not accepted
  Panicum laxum f. minor Hack. ex Stuck. -- not accepted
  Panicum laxum var. amplissimum Hack. -- not accepted
  Panicum leucophaeum var. sacchariflorum (Raddi) Hack. -- not accepted
  Panicum lilloi Hack. -- not accepted
  Panicum marginale (Rudge) Hack. -- not accepted
  Panicum megiston f. pauciflora Hack. -- not accepted
  Panicum mosambicense Hack. -- not accepted
  Panicum myriostachyum Hack. -- not accepted
  Panicum najadum Hack. & Arechav. -- not accepted
  Panicum nitidum Hack. & Arechav. -- not accepted
  Panicum pantrichum Hack. -- accepted
  Panicum parviglume Hack. -- accepted
  Panicum penicilligerum (Speg.) Hack. -- not accepted
  Panicum pilcomayense Hack. -- not accepted -- Paraguayan panicgrass
  Panicum pilosum var. polychaetum Hack. -- not accepted
  Panicum pittieri Hack. -- not accepted
  Panicum platycaule Hack. & Stuck. -- not accepted
  Panicum procerrimum Hack. -- not accepted
  Panicum procurrens f. major Hack. -- not accepted
  Panicum procurrens var. subaequiglume Hack. -- not accepted
  Panicum proliferum var. chloroticum (Nees ex Trin.) Hack. -- not accepted
  Panicum proliferum var. xanthochlorum Hack. ex Bertoni -- not accepted
  Panicum rhizogonum Hack. -- accepted
  Panicum rivulare var. grumosum (Nees) Hack. -- not accepted
  Panicum rugulosum f. effusum Hack. -- not accepted
  Panicum rugulosum var. condensatum Hack. -- not accepted
  Panicum rugulosum var. lasianthum (Trin.) Hack. -- not accepted
  Panicum sanguinale ssp. horizontale (Willd.) Hack. -- not accepted
  Panicum sanguinale var. biforme (Willd.) Hack. ex T. Durand & Schinz -- not accepted
  Panicum sanguinale var. blepharanthum Hack. ex T. Durand & Schinz -- not accepted
  Panicum sanguinale var. digitatum (Sw.) Hack. ex Urb. -- not accepted
  Panicum sanguinale var. microbachne (J. Presl) Hack. -- not accepted
  Panicum schenckii Hack. -- not accepted
  Panicum schiffneri Hack. -- not accepted -- Schiffner's panicgrass
  Panicum schmitzii Hack. -- not accepted
  Panicum sejunctum Hack. ex Pilg. -- not accepted
  Panicum spectabile var. guadeloupense Hack. -- not accepted
  Panicum spectabile var. helodes Hack. -- not accepted
  Panicum stenophyllum Hack. -- not accepted
  Panicum subglobosum Hack. -- not accepted
  Panicum subpetiolatum Hack. ex Bertoni -- not accepted
  Panicum superatum Hack. -- not accepted
  Panicum teretifolium Hack. -- not accepted
  Panicum trichocladum Hack. ex K. Schum. -- accepted
  Panicum tricolor Hack. -- not accepted
  Panicum tuerckheimii Hack. -- accepted
  Panicum venezuelae Hack. -- accepted -- Venezuelan panicgrass
  Panicum virgultorum Hack. -- not accepted
  Panicum wettsteinii Hack. -- accepted
  Pappophorum hassleri Hack. -- accepted
  Pappophorum mucronulatum f. intermedium Hack. -- not accepted
  Pappophorum mucronulatum var. subsimplex Hack. -- not accepted
  Pappophorum mucronulatum var. vaginatum (Phil.) Hack. -- not accepted
  Paspalum arechavaletae Hack. ex Arechav. -- not accepted
  Paspalum bakeri Hack. -- accepted -- Baker's crowngrass
  Paspalum barbinode Hack. -- accepted
  Paspalum bertonii Hack. -- accepted
  Paspalum brachytrichum Hack. -- accepted
  Paspalum brasiliense (Spreng.) Hack. -- not accepted
  Paspalum buchtienii Hack. -- accepted
  Paspalum campylostachya (Hack.) S. Denham -- accepted
  Paspalum cordatum Hack. -- accepted
  Paspalum crispatum Hack. -- accepted
  Paspalum densum var. elliptico-oblongum Hack. -- not accepted
  Paspalum dilatatum f. paucispica Hack. -- not accepted
  Paspalum distichum var. digitaria (Poir.) Hack. -- not accepted
  Paspalum dolichophyllum Hack. -- not accepted
  Paspalum dusenii Hack. -- not accepted
  Paspalum elatum Hack. ex Sodiro -- not accepted
  Paspalum enode Hack. ex Arechav. -- not accepted
  Paspalum fasciculatum var. paraguayense Hack. -- not accepted
  Paspalum glabriflorum (Hack.) Herter -- not accepted
  Paspalum glabrinode (Hack.) Morrone & Zuloaga -- accepted
  Paspalum glaucescens Hack. -- accepted
  Paspalum griseum Hack. ex M. Corręa -- not accepted
  Paspalum griseum Hack. ex Loefgr. -- not accepted
  Paspalum guenoarum var. rojasii (Hack.) Parodi ex Burkart -- accepted
  Paspalum hassleri Hack. -- not accepted
  Paspalum herzogii Hack. -- not accepted
  Paspalum heterotrichon var. paucispicatum Hack. -- not accepted
  Paspalum hieronymi Hack. -- not accepted -- paspalum
  Paspalum humboldtianum var. stuckertii (Hack.) Hack. -- not accepted
  Paspalum inaequivalve var. glabriflorum Hack. -- not accepted
  Paspalum juergensii Hack. -- accepted
  Paspalum lilloi Hack. -- accepted
  Paspalum macroblepharum Hack. -- not accepted
  Paspalum malacophyllum f. parviflorum Hack. -- not accepted
  Paspalum malacophyllum var. linearifolium Hack. -- not accepted
  Paspalum malacophyllum var. longipilum Hack. -- not accepted
  Paspalum marginatum var. longecilium Hack. -- not accepted
  Paspalum minarum Hack. -- accepted
  Paspalum multiflorum f. abreviatum Hack. -- not accepted
  Paspalum ovale var. apiculatum Hack. -- not accepted
  Paspalum phyllorhachis Hack. -- accepted
  Paspalum pittieri Hack. -- not accepted
  Paspalum pittieri Hack. ex Beal -- not accepted
  Paspalum planum Hack. -- accepted
  Paspalum plicatulum var. longipilum Hack. -- not accepted
  Paspalum plicatulum var. multinode Hack. -- not accepted
  Paspalum plicatulum var. robustum Hack. -- not accepted
  Paspalum pruinosum Hack. -- not accepted
  Paspalum pygmaeum Hack. -- accepted
  Paspalum pygmaeum var. genuinum Hack. -- not accepted
  Paspalum pygmaeum var. glabrescens Hack. -- not accepted
  Paspalum pygmaeum var. pygmaeum Hack. -- not accepted
  Paspalum quadrifarium var. elongatum Hack. -- not accepted
  Paspalum quadrifarium var. elongatum (Griseb.) Hack. -- not accepted
  Paspalum reticulatum Hack. -- not accepted
  Paspalum rojasii Hack. -- not accepted
  Paspalum scrobiculatum var. orbiculare (G. Forst.) Hack. -- not accepted
  Paspalum sodiroanum Hack. ex Sodiro -- not accepted
  Paspalum sodiroanum Hack. -- accepted
  Paspalum sodiroanum var. terminale Hack. ex Sodiro -- not accepted
  Paspalum sordidum Hack. -- not accepted
  Paspalum splendens Hack. -- not accepted
  Paspalum splendens var. sphacelatum Hack. -- not accepted
  Paspalum stellatum f. hirsutum Hack. -- not accepted
  Paspalum stuckertii Hack. -- not accepted
  Paspalum trichostomum Hack. -- accepted
  Paspalum ulei Hack. -- not accepted
  Paspalum uninode Hack. -- not accepted
  Paspalum usteri Hack. -- accepted
  Paspalum verrucosum Hack. -- not accepted
  Paspalum virgatum f. oligostachyum Hack. -- not accepted
  Paspalum virgatum var. subplicatum Hack. -- not accepted
  Paspalum wettsteinii Hack. -- not accepted
  Pectinaria (Benth.) Hack. -- not accepted
  Pennisetum chilense Hack. ex Buchtien -- not accepted
  Pennisetum chilense var. planifolia Hack. -- not accepted
  Pennisetum montanum (Griseb.) Hack. -- not accepted
  Pennisetum mutilatum Hack. ex Kuntze -- not accepted
  Pennisetum rigidum (Griseb.) Hack. -- not accepted
  Pennisetum setosum var. laxiusculum Hack. -- not accepted
  Phalaris angusta f. macra Hack. -- not accepted
  Phalaris angusta f. macra Hack. ex Jansen & Wacht. -- not accepted
  Phalaris aquatica var. stenoptera (Hack.) Burkart -- not accepted
  Phalaris arundinacea var. genuina Hack. -- not accepted
  Phalaris arundinacea var. japonica (Steud.) Hack. -- not accepted
  Phalaris stenoptera Hack. -- not accepted
  Phalaris tuberosa var. stenoptera (Hack.) Hitchc. -- not accepted
  Pharus cornutus Hack. -- not accepted
  Phippsia wilczekii Hack. -- accepted
  Phragmites dioicus Hack. ex Conert -- not accepted
  Phragmites dioicus Hack. ex Hicken -- not accepted
  Piptochaetium leiocarpum (Speg.) Hack. -- not accepted
  Piptochaetium leiocarpum f. leiocarpum (Speg.) Hack. -- not accepted
  Piptochaetium leiocarpum f. subpapillosa Hack. -- not accepted
  Piptochaetium napostaense (Speg.) Hack. -- accepted
  Piptochaetium ovatum f. atrata Hack. -- not accepted
  Piptochaetium ovatum var. chaetophorum (Griseb.) Hack. -- not accepted
  Piptochaetium ovatum var. purpurascens Hack. -- not accepted
  Piptochaetium panicoides f. subpapillosum (Hack.) Parodi -- not accepted
  Piptochaetium panicoides var. subpapillosum (Hack.) Petetin -- not accepted
  Piptochaetium stipoides (Trin. & Rupr.) Hack. ex Arechav. -- accepted -- purple spear grass
  Piptochaetium stipoides var. purpurascens (Hack.) Parodi -- not accepted -- purple spear grass
  Piptochaetium stipoides var. stipoides (Trin. & Rupr.) Hack. ex Arechav. -- accepted
  Piptochaetium virescens var. arsenii (Hack.) Beetle -- accepted
  Poa acrochaeta Hack. -- not accepted
  Poa aequatoriensis Hack. -- accepted
  Poa androgyna Hack. -- accepted
  Poa asperiflora Hack. -- not accepted
  Poa atropidiformis Hack. -- accepted
  Poa atropidiformis var. atropidiformis Hack. -- accepted
  Poa ayseniensis Hack. -- not accepted
  Poa boliviensis Hack. -- not accepted
  Poa buchtienii Hack. -- not accepted
  Poa buchtienii var. buchtienii Hack. -- not accepted
  Poa buchtienii var. subacuminata Hack. -- not accepted
  Poa calamagrostoidea Hack. -- not accepted
  Poa calchaquiensis Hack. -- accepted
  Poa cucullata Hack. -- accepted
  Poa denticulata Hack. -- accepted
  Poa dolichophylla Hack. -- accepted
  Poa dumetorum Hack. -- not accepted
  Poa dumetorum var. dumetorum Hack. -- not accepted
  Poa dumetorum var. unduavensis Hack. -- not accepted
  Poa dusenii Hack. -- not accepted
  Poa eligulata Hack. -- not accepted
  Poa foucaudii Hack. -- not accepted
  Poa fuegiana (Hook. f.) Hack. -- not accepted
  Poa fuegiana var. fuegiana (Hook. f.) Hack. -- not accepted
  Poa fuegiana var. involucrata Hack. -- not accepted
  Poa glomerifera Hack. -- not accepted
  Poa glumaris var. kurilensis (Hack.) Kudô -- not accepted
  Poa gracillima var. saxatilis (Scribn. & T.A. Williams) Hack. -- not accepted
  Poa hieronymii Hack. -- accepted
  Poa humillima var. exserta Hack. ex Buchtien -- not accepted
  Poa jelskii Hack. -- not accepted
  Poa kurilensis Hack. -- not accepted
  Poa lanigera var. stuckertii Hack. -- not accepted
  Poa lanigera var. tandilensis Hack. -- not accepted
  Poa leioclada Hack. -- accepted
  Poa leioclada Hack. ex Sodiro -- not accepted
  Poa lilloi Hack. -- accepted
  Poa micranthera Hack. -- not accepted
  Poa monandra Hack. -- not accepted
  Poa munozensis Hack. -- not accepted
  Poa myriantha Hack. -- accepted
  Poa palustris var. strictula (Steud.) Hack. -- not accepted
  Poa parviceps Hack. -- accepted
  Poa parviceps var. parviceps Hack. -- accepted
  Poa pichinchensis Hack. -- not accepted
  Poa pilcomayensis Hack. -- accepted
  Poa pilcomayensis var. calamagrostoidea Hack. -- not accepted
  Poa pilcomayensis var. pilcomayensis Hack. -- not accepted
  Poa plicata Hack. -- accepted
  Poa scabriflora Hack. -- not accepted
  Poa siphonoglossa Hack. -- accepted -- Kauai bluegrass
  Poa stuckertii (Hack.) Parodi -- accepted
  Poa stuckertii var. stuckertii (Hack.) Parodi -- not accepted
  Poa subenervis Hack. -- not accepted
  Poa subenervis var. subenervis Hack. -- not accepted
  Poa superata Hack. -- accepted
  Poa trachyantha Hack. -- accepted
  Poa trachyphylla Hack. -- not accepted
  Poa trachyphylla Hack. ex Sodiro -- not accepted
  Poa unduavensis Hack. -- not accepted
  Pogonatherum saccharoideum var. monandrum (Roxb.) Hack. -- not accepted
  Poidium ambiguum (Hack.) Matthei -- accepted
  Poidium juergensii (Hack.) Matthei -- accepted
  Poidium monandrum (Hack.) Matthei -- accepted
  Pollinia imberbis var. willdenowiana (Nees ex Steud.) Hack. -- not accepted
  Polypogon elongatus f. minor Hack. -- not accepted
  Polypogon elongatus var. muticus Hack. -- not accepted
  Polypogon interruptus var. crinitus (Kuntze) Hack. -- not accepted
  Polypogon monspeliensis f. argentinus Hack. -- not accepted
  Polytrias Hack. -- accepted -- Java grass
  Polytrias praemorsa (Nees ex Steud.) Hack. -- not accepted -- Javanese grass
  Polytrias racemosa (Nees) Hack. -- not accepted
  Pseudechinolaena helodes (Hack.) Herter -- not accepted
  Puccinellia argentinensis (Hack.) Parodi -- accepted
  Puccinellia mendozina (Hack.) Parodi -- accepted
  Puccinellia parviflora (Hack.) Parodi -- not accepted
  Puccinellia preslii (Hack.) Ponert -- accepted
  Puccinellia pusilla (Hack.) Parodi -- accepted
  Renvoizea glazziovii (Hack.) Zuloaga & Morrone -- accepted
  Renvoizea teretifolia (Hack.) Zuloaga & Morrone -- accepted
  Rhipidocladum pittieri (Hack.) McClure -- accepted
  Rhombolytrum monandrum (Hack.) Nicora & Rúgolo -- accepted
  Rhytachne subgibbosa (Winkl. ex Hack.) Clayton -- not accepted
  Rottboellia aurita ssp. stigmosa Hack. -- not accepted
  Rottboellia balansae Hack. -- not accepted
  Rottboellia compressa var. fasciculata Hack. -- not accepted
  Rottboellia corrugata var. areolata Hack. -- not accepted
  Rottboellia exaltata f. arundinacea (Hochst. ex A. Rich.) Hack. -- not accepted
  Rottboellia loricata ssp. glaberrima Hack. -- not accepted
  Rottboellia loricata ssp. subgibbosa Winkl. ex Hack. -- not accepted
  Rottboellia rhytachne Hack. -- not accepted
  Rottboellia rugosa var. chapmanii Hack. -- not accepted
  Rottboellia selloana Hack. -- not accepted
  Saccharum alopecuroides subvar. trinii (Hack.) Roberty -- not accepted
  Saccharum balansae (Hack.) Roberty -- not accepted
  Saccharum cayennense var. genuinum Hack. -- not accepted
  Saccharum cayennense var. laxiusculum Hack. -- not accepted
  Saccharum filiforme Hack. -- not accepted
  Saccharum giganteum Trin. ex Hack. -- not accepted
  Saccharum holcoides (Nees) Hack. -- not accepted
  Saccharum holcoides var. brevipilum Hack. -- not accepted
  Saccharum holcoides var. penicillare Hack. -- not accepted
  Saccharum holcoides var. warmingianum (Hack.) Roberty -- not accepted
  Saccharum narenga (Nees ex Steud.) Wall. ex Hack. -- accepted
  Saccharum officinarum var. brevipedicellatum Hack. -- not accepted
  Saccharum officinarum var. genuinum Hack. -- not accepted
  Saccharum officinarum var. litteratum Hack. -- not accepted
  Saccharum spontaneum var. aegyptiacum (Willd.) Hack. -- not accepted
  Saccharum spontaneum var. klagha (Jungh. ex Steud.) Hack. -- not accepted
  Saccharum trinii (Hack.) Renvoize -- not accepted
  Saccharum warmingiana Hack. -- not accepted
  Sarga trichoclada (Rupr. ex Hack.) Spangler -- not accepted
  Schenckochloa barbata (Hack.) J.J. Ortíz -- not accepted
  Schizachne Hack. -- accepted -- false melic
  Schizachyrium cirratum (Hack.) Nash -- not accepted
  Schizachyrium cirratum (Hack.) Wooton & Standl. -- accepted -- Texas bluestem
  Schizachyrium condensatum subvar. elongatum (Hack.) Roberty -- not accepted
  Schizachyrium condensatum var. scabriflorum (Rupr. ex Hack.) Roberty -- not accepted
  Schizachyrium cubense (Hack.) Nash -- accepted
  Schizachyrium gracilipes (Hack.) A. Camus -- accepted
  Schizachyrium imberbe (Hack.) A. Camus -- not accepted
  Schizachyrium lactiflorum (Hack.) Herter -- not accepted
  Schizachyrium microstachyum ssp. elongatum (Hack.) Roseng., B.R. Arrill. & Izag. -- not accepted
  Schizachyrium riedelii var. multirameum (Hack.) Henrard -- not accepted
  Schizachyrium salzmannii ssp. imberbe (Hack.) Roberty -- not accepted
  Schizachyrium sanguineum subvar. multirameum (Hack.) Roberty -- not accepted
  Schizachyrium sanguineum subvar. schottii (Rupr. ex Hack.) Roberty -- not accepted
  Schizachyrium scabriflorum (Rupr. ex Hack.) A. Camus -- accepted
  Schizachyrium schottii (Rupr. ex Hack.) Nash -- not accepted
  Schizachyrium scoparium ssp. divergens (Hack.) Gandhi & Smeins -- not accepted -- little bluestem
  Schizachyrium scoparium subvar. cubense (Hack.) Roberty -- not accepted
  Schizachyrium scoparium var. divergens (Hack.) Gould -- accepted -- little bluestem
  Schizachyrium tenerum var. cirratum (Hack.) Roberty -- not accepted
  Schizachyrium tenerum var. scabriglume (Hack.) Roberty -- not accepted
  Sclerostachya (Andersson ex Hack.) A. Camus -- accepted
  Sclerostachys (Andersson ex Hack.) A. Camus -- not accepted
  Scribneria Hack. -- accepted -- Scribner's grass
  Scribneria bolanderi (Thurb.) Hack. -- accepted -- Scribner's grass
  Senites latifolia ssp. pringlei (Hack.) Hitchc. -- not accepted
  Setaria berroi Hack. -- not accepted
  Setaria caespitosa Hack. & Arechav. -- not accepted
  Setaria caudata f. ramosa Hack. -- not accepted
  Setaria commutata Hack. -- not accepted
  Setaria discolor Hack. -- not accepted
  Setaria glaziovii Hack. -- not accepted
  Setaria gracilis f. breviglumis Hack. -- not accepted
  Setaria gracilis f. breviseta Hack. -- not accepted
  Setaria gracilis f. brevispica (Hack.) Hack. -- not accepted
  Setaria gracilis f. flaviseta (Hack.) Hack. -- not accepted
  Setaria gracilis f. longiseta (Hack.) Hack. -- not accepted
  Setaria gracilis f. pilosissima Hack. -- not accepted
  Setaria gracilis f. purpurascens (Kunth) Hack. -- not accepted
  Setaria gracilis f. radicans (Hack.) Hack. -- not accepted
  Setaria hassleri Hack. -- accepted
  Setaria hassleri var. aequalis Hack. -- not accepted
  Setaria imberbis f. breviseta Hack. -- not accepted
  Setaria imberbis f. brevispica Hack. -- not accepted
  Setaria imberbis f. flaviseta Hack. -- not accepted
  Setaria imberbis f. longiseta Hack. -- not accepted
  Setaria imberbis f. radicans Hack. -- not accepted
  Setaria imberbis f. setislongioribus Hack. -- not accepted
  Setaria imberbis f. uberior Hack. -- not accepted
  Setaria imberbis var. genuina Hack. -- not accepted
  Setaria imberbis var. gracilis (Kunth) Hack. -- not accepted
  Setaria imberbis var. purpurascens (Kunth) Hack. -- not accepted
  Setaria imberbis var. purpurascens (Kunth) Hack. ex Stuck. -- not accepted
  Setaria leiantha Hack. -- not accepted
  Setaria leiantha f. leiantha Hack. -- not accepted
  Setaria leiantha f. subhirsuta Hack. -- not accepted
  Setaria liebmannii f. trichorhachis Hack. -- not accepted
  Setaria onurus f. grandiflora Hack. -- not accepted
  Setaria onurus f. ramulosa Hack. -- not accepted
  Setaria parviflora var. pilosissima (Hack.) Pensiero -- accepted
  Setaria paucifolia var. planifolia Hack. -- not accepted
  Setaria perennis Hack. -- not accepted
  Setaria platycaulis Stuck. & Hack. -- not accepted
  Setaria scandens f. longiseta (Döll) Hack. -- not accepted
  Setaria scandens var. sphacelata Hack. -- not accepted
  Setaria setosa f. leianthina Hack. -- not accepted
  Setaria setosa f. microstachya Hack. -- not accepted
  Setaria setosa var. aestiva Hack. ex Bertoni -- not accepted
  Setaria setosa var. interrupta Hack. -- not accepted
  Setaria setosa var. scabriculmis Hack. -- not accepted
  Setaria trichorhachis (Hack.) R.C. Foster -- not accepted
  Sorghastrum albescens (Hack.) Flores -- not accepted
  Sorghastrum balansae (Hack.) Dávila -- accepted
  Sorghastrum bipennatum (Hack.) Pilg. -- accepted
  Sorghastrum canescens (Hack.) Pilg. -- not accepted
  Sorghastrum contractum (Hack.) Kuhlm. & A. Kuhn -- accepted
  Sorghastrum incompletum var. bipennatum (Hack.) Dávila -- not accepted
  Sorghastrum linnaeanum (Hack.) Nash -- not accepted
  Sorghastrum nutans ssp. albescens (Hack.) Burkart -- not accepted
  Sorghastrum nutans ssp. pellitum (Hack.) Burkart -- not accepted
  Sorghastrum nutans subvar. canescens (Hack.) Roberty -- not accepted
  Sorghastrum pellitum (Hack.) Parodi -- accepted
  Sorghum aethiopicum (Hackel) Rupr. ex Stapf -- not accepted
  Sorghum balansae Hack. -- not accepted
  Sorghum bicolor var. aethiopicum (Hack.) de Wet & Huckabay -- not accepted
  Sorghum bicolor var. virgatum (Hack.) de Wet & Huckabay -- not accepted
  Sorghum bipennatum (Hack.) Stapf -- not accepted
  Sorghum bipennatum (Hack.) Kuntze -- not accepted
  Sorghum bourgeaui (Hack.) Kuntze -- not accepted
  Sorghum cabanisii (Hack.) Kuntze -- not accepted
  Sorghum caffrorum var. bicarinatum (Hack.) Snowden -- not accepted
  Sorghum canescens Hack. -- not accepted
  Sorghum caudatum (Hack.) Stapf -- not accepted
  Sorghum cirratum (Hack.) Kuntze -- not accepted
  Sorghum condensatum var. lactiflorum (Hack.) Hack. ex Kuntze -- not accepted
  Sorghum cubense (Hack.) Kuntze -- not accepted
  Sorghum diplandrum (Hack.) Kuntze -- not accepted
  Sorghum drummondii (Nees) Hack. ex Beetle -- not accepted
  Sorghum drummondii Nees ex Hack. -- not accepted
  Sorghum gracilipes (Hack.) Kuntze -- not accepted
  Sorghum halepense f. muticum (Hack.) C.E. Hubb. -- not accepted
  Sorghum halepense f. submuticum Hack. -- not accepted
  Sorghum halepense var. genuinum Hack. -- not accepted
  Sorghum halepense var. muticum (Hack.) Hayek -- not accepted
  Sorghum halepense var. muticum (Hack.) Parodi -- not accepted
  Sorghum hallii (Hack.) Kuntze -- not accepted
  Sorghum japonicum (Hack.) Roshev. -- not accepted
  Sorghum leptocladum (Hack.) Kuntze -- not accepted
  Sorghum liebmannii (Hack.) Kuntze -- not accepted
  Sorghum longiberbi (Hack.) Kuntze -- not accepted
  Sorghum minarum (Nees) Hack. -- not accepted
  Sorghum nutans ssp. albescens Hack. -- not accepted
  Sorghum nutans ssp. avenaceum (Michx.) Hack. -- not accepted
  Sorghum nutans ssp. contractum Hack. -- not accepted
  Sorghum nutans ssp. linnaeanum Hack. -- not accepted
  Sorghum nutans ssp. micranthum Hack. -- not accepted
  Sorghum nutans ssp. pellitum Hack. -- not accepted
  Sorghum nutans ssp. scaberrimum (Nees) Hack. -- not accepted
  Sorghum nutans subvar. balansae (Hack.) Roberty -- not accepted
  Sorghum nutans subvar. canescens (Hack.) Roberty -- not accepted
  Sorghum nutans subvar. pellitum (Hack.) Roberty -- not accepted
  Sorghum nutans var. burchellii Hack. -- not accepted
  Sorghum nutans var. genuinum Hack. -- not accepted
  Sorghum nutans var. neesianum Hack. -- not accepted
  Sorghum nutans var. stipoides (Kunth) Hack. -- not accepted
  Sorghum nutans var. submuticum Hack. -- not accepted
  Sorghum piptatherum (Hack.) Kuntze -- not accepted
  Sorghum ruprechtii (Hack.) Kuntze -- not accepted
  Sorghum scabriflorum (Rupr. ex Hack.) Kuntze -- not accepted
  Sorghum schottii (Rupr. ex Hack.) Kuntze -- not accepted
  Sorghum trichocladum (Rupr. ex Hack.) Kuntze -- accepted
  Sorghum virgatum (Hack.) Stapf -- not accepted
  Sorghum vulgare var. drummondii (Nees ex Steud.) Hack. ex Chiov. -- not accepted
  Sorghum wrightii (Hack.) Kuntze -- not accepted
  Spartina densiflora var. obtusa Hack. -- not accepted
  Spartina pittieri Hack. -- not accepted
  Sporobolus acuminatus (Trin.) Hack. -- accepted
  Sporobolus argutus f. purpurascens Hack. -- not accepted
  Sporobolus argutus var. tuberculatus (Hack.) Hack. -- not accepted
  Sporobolus bahamensis Hack. -- accepted
  Sporobolus brasiliensis (Raddi) Hack. -- not accepted
  Sporobolus ligularis Hack. -- not accepted
  Sporobolus ligularis Hack. ex Sodiro -- not accepted
  Sporobolus multinodis Hack. -- accepted
  Sporobolus multinodis var. exasperatus Hack. -- not accepted
  Sporobolus phleoides Hack. -- accepted
  Sporobolus poaeoides Hack. -- not accepted
  Sporobolus tenuispica Hack. -- not accepted
  Sporobolus tenuissimus (Mart. ex Schrank) Hack. -- not accepted
  Sporobolus tuberculatus Hack. -- not accepted
  Steinchisma stenophylla (Hack.) Zuloaga & Morrone -- accepted
  Stenotaphrum dimidiatum var. americanum (Schrank) Hack. -- not accepted
  Stipa arsenii Hack. -- not accepted
  Stipa boliviensis Hack. -- not accepted
  Stipa buchtienii Hack. -- not accepted
  Stipa caespitosa var. lilloi Hack. -- not accepted
  Stipa capillifolia Hack. -- not accepted
  Stipa clandestina Hack. -- not accepted
  Stipa hypogona Hack. -- not accepted
  Stipa ichu f. interrupta Hack. -- not accepted
  Stipa ichu var. gynerioides (Phil.) Hack. -- not accepted
  Stipa illimanica Hack. -- not accepted
  Stipa juergensii Hack. -- not accepted
  Stipa jurgensii Hack. -- not accepted
  Stipa latifolia Hack. ex Arechav. -- not accepted
  Stipa latifolia var. grandiflora Hack. -- not accepted
  Stipa leptothera var. atroviolacea Hack. -- not accepted
  Stipa melanosperma var. erythrina Hack. -- not accepted
  Stipa nardoides (Phil.) Hack. ex Hitchc. -- not accepted
  Stipa neesiana f. contorta Hack. -- not accepted
  Stipa neesiana f. depauperata Hack. -- not accepted
  Stipa neesiana var. hispidula (Speg.) Hack. -- not accepted
  Stipa neesiana var. virescens Hack. -- not accepted
  Stipa nutans Hack. -- not accepted
  Stipa nutans var. nutans Hack. -- not accepted
  Stipa papillosa (Hack.) Hitchc. -- not accepted
  Stipa polyclada Hack. -- not accepted
  Stipa quinquenervis Hack. -- not accepted
  Stipa sodiroana Hack. -- not accepted
  Stipa stuckertii Hack. -- not accepted
  Stipa tenuiculmis Hack. -- not accepted
  Stipa tenuis var. papillosa Hack. -- not accepted
  Stipa tenuissima var. curamalalensis (Speg.) Hack. -- not accepted
  Stipa uspallatensis Hack. -- not accepted
  Streptochaeta sodiroana Hack. -- accepted
  Syllepis polystachya (Sw.) E. Fourn. ex Hack. -- not accepted
  Syntherisma aequiglumis (Hack. & Arechav.) Hitchc. -- not accepted
  Syntherisma curvinervis (Hack.) Hitchc. & Chase -- not accepted
  Syntherisma fiebrigii (Hack.) Chase -- not accepted
  Syntherisma leiantha (Hack.) Hitchc. -- not accepted
  Themeda arguens (L.) Hack. -- accepted -- Christmas grass
  Themeda ciliata Hack. -- not accepted
  Themeda ciliata (L. f.) Hack. ex Duthie -- not accepted
  Themeda gigantea (Cav.) Hack. -- not accepted
  Thrasya campylostachya (Hack.) Chase -- not accepted
  Thrasyopsis juergensii (Hack.) Soderstr. & A.G. Burm. -- accepted
  Trachypogon angustifolius Nees ex Hack. -- not accepted
  Trachypogon filifolius (Hack.) Hitchc. -- not accepted
  Trachypogon karwinskyi (Hack.) Nash -- not accepted
  Trachypogon plumosus subvar. secundus (J. Presl) Hack. ex Henrard -- not accepted
  Trachypogon plumosus var. montufarii (Kunth) Hack. -- not accepted
  Trachypogon polymorphus Hack. -- not accepted
  Trachypogon polymorphus subvar. dactyloides (Steud.) Hack. -- not accepted
  Trachypogon polymorphus subvar. gracilis (Andersson) Hack. -- not accepted
  Trachypogon polymorphus subvar. mollis (Nees) Hack. -- not accepted
  Trachypogon polymorphus subvar. secundus (J. Presl) Hack. -- not accepted
  Trachypogon polymorphus var. canescens (Nees) Hack. -- not accepted
  Trachypogon polymorphus var. dissolutus (Nees) Hack. -- not accepted
  Trachypogon polymorphus var. filifolius Hack. -- not accepted
  Trachypogon polymorphus var. gouinii (E. Fourn.) Hack. -- not accepted
  Trachypogon polymorphus var. karwinskyi Hack. -- not accepted
  Trachypogon polymorphus var. ligularis (Nees) Hack. -- not accepted
  Trachypogon polymorphus var. macroglossus (Trin.) Hack. -- not accepted
  Trachypogon polymorphus var. montufarii (Kunth) Hack. -- not accepted
  Trachypogon polymorphus var. plumosus (Humb. & Bonpl. ex Willd.) Hack. -- not accepted
  Trachypogon polymorphus var. vestitus (Andersson) Hack. -- not accepted
  Tragus racemosus var. berteronianus (Schult.) Hack. -- not accepted
  Trichachne eggersii (Hack.) Henrard -- not accepted
  Trichachne pittieri (Hack.) Hitchc. -- not accepted
  Trichloris pluriflora f. macra Hack. -- accepted
  Tridens avenaceus var. pygmaea (Hack.) Parodi -- not accepted
  Triodia avenacea var. pygmaea Hack. -- not accepted
  Triodia paraguayensis (Kuntze) Hack. -- not accepted
  Tripsacum dactyloides var. genuinum Hack. -- not accepted
  Tripsacum dactyloides var. monostachyum (Willd.) Hack. -- not accepted
  Trisetum barbinode var. hirtiflorum (Hack.) Louis-Marie -- accepted
  Trisetum barbinode var. sclerophyllum (Hack.) Finot -- accepted
  Trisetum buchtienii Hack. -- not accepted
  Trisetum hirtiflorum Hack. -- not accepted
  Trisetum juergensii Hack. -- accepted
  Trisetum kurtzii (Hack. ex Kurtz) Zotov -- not accepted
  Trisetum longiglume Hack. -- accepted
  Trisetum longiglume var. longiglume Hack. -- accepted
  Trisetum preslii var. buchtienii (Hack.) Louis-Marie -- not accepted
  Trisetum sclerophyllum Hack. -- not accepted
  Trisetum spicatum var. fuegianum (Hack.) Louis-Marie -- not accepted
  Trisetum spicatum var. phleoides (d'Urv.) Hack. -- not accepted
  Trisetum subspicatum var. breviglume Hack. -- not accepted
  Trisetum subspicatum var. fuegianum Hack. -- not accepted
  Trisetum subspicatum var. glabrifolium Hack. ex Macloskie & Dusén -- not accepted
  Trisetum subspicatum var. phleoides (d'Urv.) Hack. -- not accepted
  Tristachya chrysothrix f. pallida Hack. -- not accepted
  Triticum sativum var. vulgare Hack. -- not accepted
  Uniola pittieri Hack. -- accepted
  Urochloa arrecta (Hack. ex T. Durand & Schinz) Morrone & Zuloaga -- accepted -- African signalgrass
  Urochloa mosambicensis (Hack.) Dandy -- accepted -- African liverseed grass
  Valota eggersii (Hack.) Hitchc. & Chase -- not accepted
  Valota pittieri (Hack.) Chase -- not accepted
  Vulpia myuros f. hirsuta (Hack.) C.H. Blom -- not accepted
  Vulpia myuros var. hirsuta Hack. -- accepted
  Willkommia Hack. -- accepted -- willkommia
  X Elyhordeum elymoides (Hack.) J.H. Hunz. & Xifreda -- accepted
  Zerna condensata (Hack.) Holub -- not accepted
  Zeugites mexicanus var. glandulosus Hack. -- not accepted
  Zeugites pittieri Hack. -- accepted
  Zeugites pittieri var. pittieri Hack. -- not accepted
  Zeugites pittieri var. pringlei Hack. -- not accepted
  Zoysia pungens var. japonica (Steud.) Hack. -- not accepted
 
 Kingdom Bacteria
  Legionella cincinnatiensis Thacker et al., 1989 -- valid
  Legionella fairfieldensis Thacker et al., 1991 -- valid
  Legionella lansingensis Thacker et al., 1994 -- valid
  Legionella tucsonensis Thacker et al., 1990 -- valid
  Spiroplasma corruscae Hackett et al., 1996 -- valid
  Spiroplasma insolitum Hackett et al., 1993 -- valid
  Spiroplasma leptinotarsae Hackett et al., 1996 -- valid
   

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