provided by North American Flora
Houstonia prostrata Brand. Zoe 5 : 105. 1901
Houstonia parvula Brand. Zoe 5: 221. 1905.
Depressed or prostrate annual, much branched, the branches slender, 2-8 cm. long, glabrous but minutely whitish-papillose, the internodes longer or shorter than the leaves; stipules minute, usually sparsely setiferous; leaves opposite, sessile, or the lowest short-petiolate, the blades linear or linear-oblanceolate, 5-12 mm. long, 0.6-2 mm. wide, obtuse or acute, glabrous, papillose on the upper surface, 1 -nerved, the margins often re volute; flowers axillary, the pedicels stout, much shorter than the capsules, recurved after anthesis; hypanthium less than 1 mm. long, glabrous; calyx-lobes lance-oblong, acutish, about as long as the hypanthium; corolla funnelform, purplish-white, only slightly exceeding the calyx-lobes, glabrous outside; capsule subdidymous, 2.5-3 mm. broad, about three fourths inferior, minutely papillose; seeds cymbiform, 1.5 mm. long, black.
Type locality: Near La Palma, Lower California.
Distribution: On sand or gravel beds, Sinaloa and the Cape Region of Lower California.
- bibliographic citation
- Paul Carpenter Standley. 1918. RUBIALES; RUBIACEAE (pars). North American flora. vol 32(1). New York Botanical Garden, New York, NY