Gray Rockdaisy

Perityle cinerea is found in Pecos, Terrell, and Upton counties. The relatively short, appressed habit seen in some populations may be the result of browsing by sheep. Perityle vitreomontana and P. rupestris var. albiflora are thought to be closely related to the uniquely tomentose-canescent P. cinerea.

Plants 8–25(–45) cm (profusely branched, densely leafy); densely tomentose-canescent. Leaves: petioles 6–10 mm; blades usually broadly ovate to subdeltate, rarely subreniform, 6–15 × 6–18 mm, margins deeply serrate (veins conspicuous). Heads borne singly or in corymbiform arrays, 8–10 × 4–7 mm. Peduncles 3–10 mm. Involucres narrowly campanulate. Phyllaries 8–16, linear-lanceolate to oblanceolate, 4–7 × 1–2 mm. Disc florets 10–15; corollas white, tubes 1–1.6 mm, throats tubular, 2.4–3.2 mm, lobes 0.6–1.2 mm. Cypselae 2.6–3(–3.5) mm; pappi of (10–)14–20 bristles 1–3 mm. 2n = ca. 136.

Laphamia cinerea A. Gray in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 82. 1859; Pappothrix cinerea (A. Gray) Rydberg

Pappothrix cinerea (A. Gray) Rydberg
Laphamia cinerea A. Gray; Torr. Bot. Mex. Bound. Surv. 82. 1859.
A suffruticose perennial, woody below; stems leafy, branched, 1-2 dm. high, white-
tomentose when young; leaves opposite, rounded, subentire or sinuate-dentate, 1-1.5 cm. long,
tomentose when young, glabrate in age; involucre cylindric, about 6 mm. long and 4 mm.
broad; bracts oblong, acute, tomentose; rays wanting; tube of disk-corollas fully 1.5 mm. long;
throat nearly cylindric, 3 mm. long; achenes oblong, pubescent, usually with 2 ribs on one or
both margins; pappus of subulate barbellate awns about 2 mm. long.
Type locality: Escondido Creek, Texas. Distribution: Western Texas.