provided by North American Flora
Houstonia umbratilis B. L. Robinson, Proc. Am. Acad. 45: 401
Prostrate perennial, the stems herbaceous, branched, glabrous, the branches very slender,
matted, quadrangular, rooting at the nodes; stipules minute; leaves very shortly petiolate, the
blades ovate or broadly ovate, 2.5-4 mm. long, 1.8-3 mm. wide, rounded or obtuse at the base,
acute or acutish at the apex, green above and minutely scaberulous, slightly paler beneath and
glabrous, 1-nerved; flowers terminal, solitary or geminate, the pedicels filiform, 1.5 cm. long;
hypanthium turbinate; calyx-lobes lance-oblong, acute, twice as long as the hypanthium;
corolla funnelform, about 7 mm. long, the lobes ovate; anthers exserted, linear-oblong.
Type locality: Shaded cliffs of mountains near Monterrey, Nuevo Leon. Distribution: Known only from the type locality.
- bibliographic citation
- Paul Carpenter Standley. 1918. RUBIALES; RUBIACEAE (pars). North American flora. vol 32(1). New York Botanical Garden, New York, NY