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Source: Ruppiaceae of North America Update, database (version 2011)

ITIS records citing this source
 
 Kingdom Plantae
  Ruppia L. -- accepted -- widgeonweed
  Ruppia anomala Ostenf. -- not accepted -- yerba de zanja
  Ruppia cirrhosa (Petagna) Grande -- accepted -- spiral ditchgrass
  Ruppia cirrhosa ssp. occidentalis (S. Watson) Á. Löve & D. Löve -- not accepted
  Ruppia didyma Sw. ex Wikstr. -- accepted
  Ruppia maritima L. -- accepted -- widgeon-grass, widgeongrass
  Ruppia maritima var. brevirostris J. Agardh -- not accepted
  Ruppia maritima var. exigua Fernald & Wiegand -- not accepted
  Ruppia maritima var. intermedia (Thed.) Asch. & Graebn. -- not accepted
  Ruppia maritima var. longipes Hagstr. -- not accepted
  Ruppia maritima var. maritima L. -- not accepted -- widgeonweed
  Ruppia maritima var. obliqua (Schur) Asch. & Graebn. -- not accepted
  Ruppia maritima var. occidentalis (S. Watson) Graebn. -- not accepted
  Ruppia maritima var. pacifica H. St. John & Fosberg -- not accepted
  Ruppia maritima var. rostrata J. Agardh -- not accepted
  Ruppia maritima var. spiralis (Dumort.) Moris -- not accepted
  Ruppia maritima var. subcapitata Fernald & Wiegand -- not accepted
  Ruppia occidentalis S. Watson -- not accepted
  Ruppia pectinata Rydb. -- not accepted
  Ruppia spiralis Dumort. -- not accepted
  Ruppiaceae -- accepted -- ditch grass, ditch-grass, ditchgrass
   

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