Perityle sect. Pappothrix

(A. Gray) A. M. Powell

Sida 3: 277. 1968.

Basionym: Laphamia sect. Pappothrix A. Gray Smithsonian Contr. Knowl. 3(5): 99. 1852
Synonyms: Undefined sect. Pappothrix (A. Gray) Rydberg
Treatment appears in FNA Volume 21. Treatment on page 318. Mentioned on page 317, 320, 325.

Perennials or subshrubs (usually in rock crevices, stems often brittle). Involucres cylindric, narrowly funnelform, or campanulate, 6–12 × 3–15 mm. Ray florets 0. Disc florets 5–150; corollas cream, yellow, or white. Cypselae oblong to narrowly oblanceolate, partially flattened to subcylindric, usually somewhat rounded or angled on 1 or both faces, margins inconspicuously calloused, almost glabrous or short-hairy; pappi of 8–35 unequal, antrorsely barbellulate bristles 0.5–3.5 mm (in P. vitreomontana all but 2–3 may be reduced to vestigial nubs). x = 17.

Distribution

sw United States.

Discussion

Species 6 (6 in the flora).

Key

1 Disc florets 20–150; corollas yellow; New Mexico Perityle cernua
1 Disc florets 5–16; corollas cream, yellow, or white; New Mexico, Texas > 2
2 Disc florets 5–6(–8); phyllaries 5–6; plants usually glabrate or puberulent, sometimes hirtellous; New Mexico, Texas Perityle quinqueflora
2 Disc florets 8–16; phyllaries 8–16; plants hirsute, pilose, puberulent, or tomentose-canescent; Texas > 3
3 Leaf blades deltate to ovate overall, 3-lobed Perityle fosteri
3 Leaf blades ovate, ovate-deltate, subcordate, subdeltate, subovate, or subreniform (not 3-lobed, margins usually toothed) > 4
4 Corollas yellow or white; pappi of (16–)20–30 bristles; plants hirsute, pilose, or puberulent Perityle rupestris
4 Corollas white; pappi of 2–20 bristles; plants pilose or tomentose-canescent > 5
5 Plants pilose; pappi of 2–6 bristles plus vestigial nubs between bristles, or of 10–20 bristles Perityle vitreomontana
5 Plants densely tomentose-canescent; pappi of (10–)14–20 bristles Perityle cinerea