Acleisanthes wrightii

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 erect or ascending to decumbent, much-branched, 10-40 cm, puberulent to glabrate. Leaves yellowish green, petiolate, those of pair subequal; petiole 1-15 mm, puberulent; blade oval to ovate-lanceolate or suborbiculate, 5-35 × 3-20 mm, base slightly unequal and obtuse to rounded or acute, margins crispate, apex apiculate and obtuse or infrequently acute, hirtellous to puberulent. Inflorescences solitary flowers, sessile or with pedicel to 1 mm; bracts linear-subulate, 2-8 mm, hirtellous to puberulent. Flowers: chasmogamous perianth 2.5-5 cm, puberulent to hirtellous, tube 1-1.5 mm diam., limbs 10-15 mm diam., stamens 5; cleistogamous perianth 3-8 mm, hirtellous, stamens 2(-5). Fruits prominently 5-ribbed and deeply 5-sulcate, ribs broad, smooth, each terminating in hemispheric, glandular tubercle, tubercule oblong, truncate at both ends, 5-9 mm, puberulent.

Flowering spring-fall. Various soils on calcareous substrates in grasslands or shrublands; of conservation concern; 200-1000 m; Tex.; Mexico (Coahuila).