Comprehensive Description
provided by North American Flora
Houstonia asperuloides (Benth.) A. Gray, Proc. Am. Acad. 5:
158. 1860.
Hedyotis asperuloides Benth. Bot. Voy. Sulph. 19. 1844.
Erect or ascending annual, 1-3 dm. high, diffusely branched, the branches very slender,
subangulate, minutely hispidulo-puberulent or glabrous, the internodes longer than the leaves;
stipules minute, scarious, copiously setiferous; leaves sessile, linear, 0.5-2.5 cm. long, 0.5-1 mm.
wide, obtuse or acutish, glabrous, or obscurely puberulent on the upper surface ; flowers axillary
and in lax terminal cymes, mostly on filiform pedicels 2.5 cm. long or shorter; hypanthium less
than 1 mm. long, glabrous; calyx-lobes lance-linear, very acute, longer than the hypanthium,
in fruit much exceeding the capsule; corolla funnelform, 7-8 mm. long, usually minutely
puberulent outside, pink, the lobes ovate or oblong-ovate, obtuse, glabrous within, usually
as long as the tube; stamens exserted; capsule turbinate, 2-3 mm. long and scarcely more
than half as wide, almost wholly inferior, refuse at the apex; seeds oval-oblong, peltate,
concavo-convex, minutely scrobiculate, pale-brown.
Type locality: Cape San Lucas, Lower California. Distribution: Sandy plains, southern Lower California.
- bibliographic citation
- Paul Carpenter Standley. 1918. RUBIALES; RUBIACEAE (pars). North American flora. vol 32(1). New York Botanical Garden, New York, NY