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| Kingdom | Plantae
– plantes, Planta, Vegetal, plants |
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| Subkingdom | Viridiplantae
– green plants |
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| Infrakingdom | Streptophyta
– land plants |
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| Superdivision | Embryophyta
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| Division | Tracheophyta
– vascular plants, tracheophytes |
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| Subdivision | Spermatophytina
– spermatophytes, seed plants, phanérogames |
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| Class | Magnoliopsida
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| Superorder | Asteranae
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| Order | Gentianales
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| Family | Rubiaceae
– madders, rubiacées |
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| Genus | Houstonia L. – bluet |
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Direct Children: |
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| Species |
Houstonia acerosa (A. Gray) Benth. & Hook. f.
– needleleaf bluet | |
| Species |
Houstonia caerulea L.
– azure bluet | |
| Species |
Houstonia canadensis Willd. ex Roem. & Schult.
– Canadian summer bluet | |
| Species |
Houstonia correllii (W.H. Lewis) Terrell
– Correll's bluet | |
| Species |
Houstonia croftiae Britton & Rusby
– Croft's bluet | |
| Species |
Houstonia greenei (A. Gray) Terrell
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| Species |
Houstonia humifusa (A. Gray) A. Gray
– matted bluet, mat bluets | |
| Species |
Houstonia longifolia Gaertn.
– longleaf bluet, houstonie à longues feuilles, long-leaf summer bluet, longleaf summer bluet | |
| Species |
Houstonia micrantha (Shinners) Terrell
– southern bluet | |
| Species |
Houstonia ouachitana (E.B. Sm.) Terrell
– Ouachita bluet | |
| Species |
Houstonia parviflora Holz. ex Greenm.
– Greenman's bluet | |
| Species |
Houstonia procumbens (J.F. Gmel.) Standl.
– roundleaf bluet | |
| Species |
Houstonia prostrata Brandegee
– New Mexico starviolet | |
| Species |
Houstonia purpurea L.
– Venus' pride, purple bluets | |
| Species |
Houstonia pusilla Schoepf
– tiny bluet | |
| Species |
Houstonia rosea (Raf.) Terrell
– rose bluet | |
| Species |
Houstonia rubra Cav.
– red bluet | |
| Species |
Houstonia serpyllifolia Michx.
– thymeleaf bluet | |
| Species |
Houstonia subviscosa (C. Wright ex A. Gray) A. Gray
– nodding bluet | |
| Species |
Houstonia wrightii A. Gray
– pygmy bluet | |
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