Perityle dissecta

(Torrey) A. Gray

in A. Gray et al., Syn. Fl. N. Amer. 1(2): 320. 1884.

Common names: Slim-lobe or dissected rock daisy
Conservation concern
Basionym: Laphamia dissecta Torrey Smithsonian Contr. Knowl. 5(6): 81. 1853
Treatment appears in FNA Volume 21. Treatment on page 331. Mentioned on page 324, 332.

Perennials or subshrubs, 7–20 cm (densely leafy); pilose. Leaves: petioles (3–)4–10 mm; blades lanceolate to deltate, 4–15 × 4–15 mm, usually 1–3-pinnately divided, lobes irregular, rounded, ultimate margins laciniate. Heads borne singly or in corymbiform arrays, 8–10 × 4–5 mm. Peduncles 2–8(–17) mm. Involucres campanulate. Phyllaries 12–15, linear to linear-lanceolate, (5–)7–13 × 0.5–0.9 mm (apices usually attenuate, sometimes acute). Ray florets 0. Disc florets 20–30; corollas yellow, tubes 1–1.5 mm, throats usually narrowly tubular, (2–)2.5–2.8 mm, lobes 0.7–1 mm. Cypselae oblong to narrowly oblanceolate, (2.8–)3–3.8 mm, margins moderately calloused, short-hairy; pappi 0, or of 1(–4) moderately stout bristles (1–)2.2–3 mm. 2n = 34, 68.

Phenology: Flowering spring–fall.
Habitat: Limestone walls of canyons
Elevation: 800–1200 m


Of conservation concern.

Perityle dissecta occurs in southern Brewster and Presidio counties. It and P. lemmonii have been considered conspecific by some taxonomists because of similarities in gross leaf morphology. The differences in phyllaries, disc corollas, and pappus bristles, as well as distinct distributions, support recognizing them as separate species.

Selected References


Lower Taxa

... more about "Perityle dissecta"
Sharon C. Yarborough +  and A. Michael Powell +
(Torrey) A. Gray +
Laphamia dissecta +
Slim-lobe or dissected rock daisy +
Tex. +  and Mexico (Chihuahua). +
800–1200 m +
Limestone walls of canyons +
Flowering spring–fall. +
in A. Gray et al., Syn. Fl. N. Amer. +
Conservation concern +
Undefined (tribe Undefined) subtribe Amauriinae +
Perityle dissecta +
Perityle sect. Laphamia +
species +