Acleisanthes wrightii (A. Gray) Benth. & Hook. fil. ex Hemsl.

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.

Tex.; Mexico (Coahuila).

Flowering spring-fall.

Various soils on calcareous substrates in grasslands or shrublands; of conservation concern; 200-1000m.

Pentacrophys wrightii A. Gray, Amer. J. Sci. Arts, ser. 2, 15: 261. 1853

Acleisanthes wrightii (A. Gray) Benth. & Hook.; Hetnsl. Biol
Centr. Am. Bot. 3: 6. 1882.
Pentacrophys Wrightii A. Gray, Am. Jour. Sci. II. IS: 261. 1853.
Plants erect or ascending, from a fruticose caudex, 1-3 dm. high, much branched from the base, the branches glandular-hirtellous ; leaves of a pair subequal, the petioles 3-15 mm. long, the blades suborbicular to oval, 0.8-2.5 cm. long, 0.6-1.6 cm. wide, rounded at both ends or rarely only obtuse and apiculate at the apex, slightly unequal at the base, thick and firm, often crispate, paler beneath, glandular-hirtellous or puberulent; flowers axillary, solitary* sessile, usually cleistogamous, the bracts linear-subulate, hirtellous, one third as long as the fruit or shorter; perianth of the cleistogamous flowers 5 mm. long, densely glandular-hirtellous, with 2 stamens; fruit oblong, 6 mm. long, truncate at both ends, deeply 5-sulcate, glandularpuberulent, the costae broad, smooth, each ending above in a globose glanduliferous tubercle.
Type locality: Stony prairies at the Big Bend of the San Pedro River, western Texas.
Distribution: Western Texas.