Perityle sect. Pappothrix in Flora of North America @ efloras.org

352a. Perityle Bentham sect. Pappothrix (A. Gray) A. M. Powell, Sida. 3: 277. 1968.

Laphamia A. Gray sect. Pappothrix A. Gray, Smithsonian Contr. Knowl. 3(5): 99. 1852; Pappothrix (A. Gray) Rydberg

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.

Species 6 (6 in the flora): sw United States.

SELECTED REFERENCE

Powell, A. M. 1969. Taxonomy of Perityle, section Pappothrix (Compositae–Peritylanae). Rhodora 71: 58–93.

1 Disc florets 20–150; corollas yellow; New Mexico 1 Perityle cernua

+ Disc florets 5–16; corollas cream, yellow, or white; New Mexico, Texas (2)

2 (1) Disc florets 5–6(–8); phyllaries 5–6; plants usually glabrate or puberulent, sometimes hirtellous; New Mexico, Texas 2 Perityle quinqueflora

+ Disc florets 8–16; phyllaries 8–16; plants hirsute, pilose, puberulent, or tomentose-canescent; Texas (3)

3 (2) Leaf blades deltate to ovate overall, 3-lobed 4 Perityle fosteri

+ Leaf blades ovate, ovate-deltate, subcordate, subdeltate, subovate, or subreniform (not 3-lobed, margins usually toothed) (4)

4 (3) Corollas yellow or white; pappi of (16–)20–30 bristles; plants hirsute, pilose, or puberulent 3 Perityle rupestris

+ Corollas white; pappi of 2–20 bristles; plants pilose or tomentose-canescent (5)

5 (4) Plants pilose; pappi of 2–6 bristles plus vestigial nubs between bristles, or of 10–20 bristles 5 Perityle vitreomontana

+ Plants densely tomentose-canescent; pappi of (10–)14–20 bristles 6 Perityle cinerea

Lower Taxa