Narrow Leaved Rockdaisy

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.

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.

Laphamia angustifolia A. Gray, Smithsonian Contr. Knowl. 3(5): 100. 1852; L. angustifolia subsp. laciniata (A. Gray) W. E. Niles

Laphamia angustifolia A. Gray, PI. Wright. 1: 100. 1852
A perennial with a thick woody caudex; stem about 1 dm. high, minutely and sparingly puberulent; leaves alternate or some opposite; blades lanceolate or oblanceolate, with a few sharp teeth or entire, 1-1.5 cm. long, glandular-pimctate, less distinctly 3-ribbed; heads corymbose; involucre 4 mm. high, 4-5 mm. broad; bracts linear-oblanceolate, slightly puberulent, ciliate towards the apex; rays wanting; disk-corollas 2.5 mm. long; tube nearly equaling the narrowly campanulate throat; achenes oblong-oblanceolate, puberulent, 2 mm. long; pappus wanting.
Type locality: "Between Texas and El Paso." Distribution: Western Texas.

Laphamia laciniata (Terr.) Rydberg, sp. nov
Laphamia angustifolia ? laciniata Torr. Bot. Mex. Bound. Surv. 82. 1859.
A perennial with woody caudex; stems decumbent, diffuse, 3-5 dm. long, grayish-puberulent; leaves mostly alternate; petioles about 1 cm. long; blades spatulate or cuneate, with few lanceolate salient teeth, 1-2 cm. long, puberulent and somewhat punctate, triple-ribbed; involucre turbinate, 5 mm. high, about 6 mm. broad; bracts oblanceolate, grayish-puberulent ; raj-s wanting; disk-corollas fully 3 mm. long; tube slightly shorter than the deeply campanulate throat; achenes fully 3 mm. long, pilose; pappus wanting.
Type locality: Crevices of rocks along the Rio Grande, Texas. Distribution: Western Texas.