Perityle angustifolia

Perennials or subshrubs, 8-35(-70) cm (stems densely leafy); glabrate or puberulent. Leaves: petioles 0-12 mm; blades usually lanceolate, linear, or oblanceolate, rarely ovate, usually 3- or 5-lobed (lobes acute or attenuate; bases cuneate), (5-)15-30 × 2-15 mm, ultimate margins entire, subentire, or laciniate. Heads borne singly or in loose, corymbiform arrays, 5.5-7(-9) × 3.5-5.5(-6) mm. Peduncles 6-50 mm. Involucres narrowly campanulate to campanulate. Phyllaries 12-15, narrowly to broadly lanceolate, 4-5 × 1-2 mm. Ray florets 0. Disc florets 20-33(-50); corollas yellow, tubes 1-1.5 mm, throats narrowly campanulate, 1-1.5 mm, lobes 0.5-1 mm. Cypselae narrowly oblanceolate to linear-oblong, 2-3 mm, margins thin-calloused, puberulent; pappi usually 0, sometimes 1-2 bristles 1.5-2 mm. 2n = 34, ca. 136.

Flowering spring-fall. Limestone crevices; 300-1300 m; Tex.

Perityle angustifolia occurs in crevices of Cretaceous limestone in west Texas near the Rio Grande and along the eroded, western edge of the Edwards Plateau.