Needletip Trumpets

Plants herbaceous, overall pubescence mixture of capitate-glandular hairs 0.2-0.3 mm and white, capitate, shorter hairs 0.1-0.2 mm. Stems decumbent to ascending, much branched, 10-40 cm, hirtellous to glabrate. Leaves yellowish green, usually petiolate, distalmost sessile or nearly so, those of pair subequal; petiole 1-15 mm, puberulent to hirtellous; blade oval to oblong-elliptic, (5-)10-50 × 3-20(-25) mm, base acute to obtuse, margins crispate or undulate, apex apiculate and acute to obtuse or infrequently rounded; margins and adaxial midveins puberulent or occasionally hirtellous. Inflorescences solitary flowers, sessile or nearly so; bracts linear to subulate, 3-10 mm, hirtellous to puberulent. Flowers: chas-mogamous perianth 2-5 cm, puberulent, tube 1-1.5 mm diam., limbs 10-30 mm diam., stamens 5; cleistogamous perianth 4-10 mm, hirtellous, stamens 2(-5). Fruits with 5 narrow sulci and 5 broad, smooth ribs extending past glands, each bearing sticky, resinous gland in constriction below apex, ovate-oblong, constricted 0.5-1 mm below apex, 5-8 mm, base tapering, apex truncate, sparsely puberulent or glabrous.

Tex.; Mexico (Chihuahua, Coahuila, Durango, Zacatecas).

Flowering spring-fall.

Calcareous or gypseous soils in grasslands and shrublands; 700-2500m.

Acleisanthes acutifolia Standley, Contr. U. S. Nat. Herb. 12: 370
1909.
Pentacrophys Wrightii Torr. Bot. Mex. Bound. Surv. 170, in part. 1859. Not P. Wrightii A. Gray, 1853.
Plants ascending or procumbent, from a thick woody base, much branched from the base, the branches stout, 1-4 dm, long, puberulent and sparsely glandular-hirtellous, glaucous; leaves of a pair subequal, the petioles 3-8 mm. long, or wanting in the uppermost leaves, the blades oblong-elliptic to oval, 1.2-5 cm. long, 0.4—2 cm. wide, obtuse to acute at the base, obtuse or acute at the apex, usually crispate, thick and fleshy, glaucescent beneath; flowers axillary, sessile or short-pedicellate, usually solitary, the bracts linear-subulate, equaling or often slightly exceeding the fruit, the perianth 4-4.5 cm. long, glandular-puberulent or hirtellous outside, the tube slender, 1.5 mm. in diameter, the limb 2-2.5 cm. broad; stamens 5, short-exserted ; fruit oval-oblong, 6 mm. long, rounded at the base, constricted and truncate at the apex, glandular-puberulent or glabrate, 5-sulcate, the costae broad, flat, smooth, each bearing a gland in a depression below the apex.
Type locality: Maxon's Spring, Texas.
Distribution: Southwestern Texas, Chihuahua, and Coahuila.