Acleisanthes parvifolia (Torrey) R. A. Levin

Plants herbaceous or ± woody at base, overall moderately pubescent with glandular hairs and minute, appressed, white, flattened hairs with conic bases . Stems erect or ascending, sparsely leafy, 15-60 cm. Leaves yellow-green, drying dull brownish green, petiolate, those of a pair slightly unequal, abruptly reduced toward inflorescence, somewhat succulent; petiole 1-8 mm; blade ovate or ± diamond-shaped, 9-22 × 4-12 mm, base obtuse or ± cordate, margins entire or undulate, apex acute. Flowers usually 1 in axils of bracts in repeatedly forked inflorescences; pedicel 1-3 mm; perianth 34-52 mm, tube yellowish green, limbs pale yellowish green, 10-15 mm diam.; stamens 5. Fruits 8-10 mm, puberulent with glandular hairs and white flattened hairs; wings 2-4 mm wide.

Tex.; Mexico (ne Chihuahua).

Flowering late spring-early fall.

Dry gypseous clays and shales; 600-1000m.

Selinocarpus diffusus A. Gray var. parvifolius Torrey in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 168. 1859; S. parvifolius (Torrey) Standley

Selinocarpus parvifolius (Torr.) Standley, Contr. U. S. Nat
Herb. 12: 388. 1909.
Selinocarpus diffusus parivfolius Torr. Bot. Mex. Bound. Surv. 168. 1859.
Plants erect, 2-4 dm. high, suffrutescent at the base, much branched, the branches stout, glandular-puberulent and bearing numerous short stout flat white appressed hairs, glabrate in age, glaucous; petioles stout, 3-6 mm. long; leaf-blades oval to ovate-oval, 1-2.2 cm, long, 0.5-1 cm. wide, obtuse or acute at the base, obtuse or rounded at the apex, thick and fleshy, crispate, puberulent; flowers numerous, terminal, short-pedicellate, subtended by broadly ovate minute bracts, the inflorescence repeatedly dichotomous, dense, bearing numerous orbicular or ovate-orbicular, petiolate, bractlike leaves 2-3 mm. long; perianth 3-4 cm. long, densely glandular-puberulent, the tube very slender, the limb about 13 mm. broad; fruit 9-10 mm. long, 5-winged, the wings 3-4 mm. broad, the body striate, finely glandular-puberulent.
Type locality: Canyons of the Rio Grande, Texas. Distribution: Southwestern Texas.

Acleisanthes parvifolia, common names littleleaf moonpod and Big Bend trumpets, is a plant species native to northeastern Chihuahua, Mexico, and western Texas, United States. In Texas, is known from only 4 counties: Culberson, Hudspeth, Brewster and Presidio. Some of the populations are situated inside Big Bend National Park, others within Guadalupe Mountains National Park.

Acleisanthes parvifolia is a perennial herb up to 60 cm tall, sometimes a bit woody at the base. Leaves are yellow-green, up to 25 mm long. Flowers are usually solitary, yellow-green, up to 6 cm long. Fruits are up to 10 mm long, hairy.