Acleisanthes longiflora A. Gray

Plants herbaceous, often slightly woody at base, overall pubescence of white, capitate hairs 0.2-0.4 mm. Stems ascending to prostrate or sprawling, profusely branched, to 100 cm, puberulent to glabrate, occasionally hirtellous. Leaves grayish green, petiolate, those of pair slightly unequal; petiole 1-14 mm, puberulent to glabrate; blade lanceolate to linear-lanceolate or triangular-lanceolate to deltate, 3-40 × 1-30 mm, base cuneate and decurrent, margins undulate or crispate, apex acuminate to acute or long attenuate, glaucous, puberulent to glabrate. Inflorescences solitary flowers, rarely geminate, sessile or with pedicel to 7 mm; bracts linear-subulate, 1-7 mm, puberulent to sparsely so. Flowers: chasmogamous perianth with tubes 7-17 cm × 1-2 mm, puberulent to glabrate, limbs 10-20 mm diam., stamens 5; cleistogamous perianth 5-12 mm, puberulent, stamens 5. Fruits with 5 hyaline ridges and pair of shallow, parallel grooves between ridges, without resinous glands, narrowly oblong, truncated at both ends, constricted 1 mm both below apex and above base, 6-10 mm, hirtellous to puberulent with capitate hairs and many to few, minute, moniliform hairs 0.2-0.4 mm, or glabrate.

Ariz., Calif., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, Sonora, Tamaulipas).

Flowering Feb-Nov.

Rocky, gravelly, loamy, or sandy calcareous, gypseous, or igneous-derived soils in deserts, grasslands, shrublands, or woodlands; 0-2500m.

Acleisanthes longiflora A. Gray, Am. Jour. Sci. II. 15: 261
1853.
Plants decumbent or ascending, from a slender or thick woody root, much branched, the branches slender, 2—5 dm. long, cinereo-puberulent or. rarely short-hirtellous, glabrate below; leaves of a pair subequal, the petioles stout or slender, 3-8 mm. long, the blades broadly deltoid-ovate or rhombic-ovate to deltoid, lanceolate, or linear-lanceolate, 1.5-4.5 cm. long, 0.3-3.5 cm. wide, truncate to acute at the base and decurrent, acuminate or rarely acute to long-attenuate at the apex, thick and succulent, glaucous, often crispate, the margins then undulate or when dry apparently coarsely dentate, sparsely cinereo-puberulent when young or rarely short-puberulent, soon glabrate; flowers axillary, solitary, sessile or subsessile, the bracts linear-subulate, half as long as the fruit or shorter, the perianth 9—17 cm. long, white tinged with purple, sparsely and minutely puberulent outside, the tube very slender, 1.5-2 mm. in diameter, the limb 1.5-2 cm. broad; stamens short-exserted ; fruit narrowly oblong, 5-6 mm. long, truncate at both ends, 5-angulate, puberulent or rarely short-hirtellous, often
glabrate.
Type locality: Valley of the Limpio, western Texas.
Distribution: In dry, often alkaline soil, southern and western Texas to Riverside County, California, southward to Chihuahua and Coahuila.

Acleisanthes longiflora est une plante de la famille des Nyctaginaceae, originaire du Mexique et du sud des États-Unis.