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Houstonia
Family: Rubiaceae Steven J. Baskauf	VPAP Resources 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.
Show all taxa Houstonia acerosa Houstonia arenaria Houstonia asperuloides Houstonia bouvardioides Images not available Houstonia brandegeana Houstonia butterwickiae Houstonia caerulea Houstonia calycosa Houstonia canadensis Houstonia ciliolata Houstonia coerulea Houstonia correllii Images not available Houstonia croftiae Houstonia floridana Houstonia humifusa Houstonia lanceolata Houstonia longifolia Houstonia micrantha Houstonia montana Houstonia mucronata Houstonia mullerae Houstonia ouachitana Houstonia palmeri Houstonia parviflora Houstonia polypremoides Houstonia procumbens Houstonia prostrata Houstonia purpurea Houstonia pusilla Houstonia pygmaea Houstonia rosea Houstonia rotundifolia Houstonia rubra Houstonia serpyllifolia Houstonia setiscaphia Houstonia sharpii Houstonia spellenbergii Images not available Houstonia subviscosa Houstonia tenuifolia Houstonia umbratilis Houstonia wrightii