Perityle sect. Pappothrix

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).

Selected References

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

Lower Taxa

Perityle cernua, Perityle cinerea, Perityle fosteri, Perityle quinqueflora, Perityle rupestris, Perityle vitreomontana

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