Comprehensive Description

provided by North American Flora
Houstonia arenaria Rose, Contr. U. S. Nat. Herb. 1: 70. 1890
Erect or ascending annual, 1-4 dm. high, the stems simple or much branched below, the
branches slender, ascending or spreading, more or less angulate, glabrous, the internodes
longer or shorter than the leaves; stipules minute, scarious, laciniate; leaves sessile or nearly
so, linear or lance-linear, 1-3.5 cm. long, 1-5 mm. wide, acute at the apex, attenuate at the
base, thin, glabrous, paler beneath, 1 -nerved; flowers secund, in lax naked cymes, mostly
sessile, the terminal ones often long-pedicellate; hypanthium less than 1 mm. long, glabrous;
calyx-lobes oblong, obtuse, equaling or exceeding the hypanthium, in fruit much exceeding the
capsule, the margins obscurely scaberulous; corolla funnelform, white, 3-5 mm. long, usually
minutely puberulent outside, the lobes oblong, obtuse, half as long as the tube or longer,
glabrous within; anthers exserted; capsule subglobose, somewhat narrowed at the base, 2-2.5
mm. thick, costate, almost wholly inferior; seeds oblong, peltate, concavo-convex, minutely
scrobiculate, dark-brown.
Type locality: La Paz, Lower California. Distribution: 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
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