Houstonia
Family: Rubiaceae
Houstonia image
Steven J. Baskauf
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JANAS 29(1)
PLANTS: Annual or perennial herbs. LEAVES: opposite (in AZ), with inter-petiolar stipules. INFLORESCENCE: cymose or solitary. FLOWERS: het-erostylous (distylous) or homostylous; calyces 4-lobed; corollas 4-lobed, salverform, funnelform, or tubular; stamens 4; stigmas bifid. FRUITS: biloculate capsules, 1/4-3/4 inferior. SEEDS: 2-45 per capsule, crateriform, i.e., subglobose with interior hilar cavity lacking hilar ridge, or slightly to somewhat compressed, with linear or oblong hilar ridge in a saucer- or cup-shaped concavity. NOTES: 20 spp.; U.S., Can., Mex. (for William Houstoun, British physician). REFERENCES: Terrell, Edward E. 1995 Rubiaceae. Houstonia. J. Ariz. - Nev. Acad. Sci. 29(l): 36.
Species within checklist: Flora of Federal Protected Areas, Desert West
Houstonia acerosa
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Houstonia caerulea
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Houstonia fasciculata
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Houstonia humifusa
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Houstonia longifolia
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Houstonia micrantha
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Houstonia ouachitana
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Houstonia parviflora
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Houstonia purpurea
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Houstonia pusilla
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Houstonia rosea
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Houstonia rubra
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Houstonia wrightii
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