Perityle aglossa

A. Gray

Smithsonian Contr. Knowl. 5(6): 107. 1853.

Common names: Rayless rock daisy bluff rock daisy
Synonyms: Laphamia aglossa (A. Gray) Bentham & Hooker f.
Treatment appears in FNA Volume 21. Treatment on page 323. Mentioned on page 321.

Perennials or subshrubs, 15–45 cm (in rock crevices); glandular-pubescent. Leaves: petioles 8–23 mm; blades ovate, subcordate, or subdeltate, 6–20 × 5–25 mm, margins irregularly lobed, laciniate, serrate-dentate, or shallowly 3-lobed. Heads borne singly or (2–3) in corymbiform arrays, 8–11 × 4–8 mm. Peduncles 10–25 mm. Involucres campanulate. Phyllaries 14–24, linear to linear-lanceolate, (5–)6–10 × 0.5–1 mm, apices long-attenuate. Ray florets 0. Disc florets 20–60; corollas yellow, often pink or purple tinged, tubes 1–1.7 mm, throats tubular, 2.1–3.2 mm, lobes 0.4–0.6 mm. Cypselae oblong to narrowly oblanceolate, (1–)2–3.2 mm, margins prominently calloused, densely ciliate; pappi of 1(–2) antrorsely barbellate bristles 3.5–6 mm plus crowns of hyaline, laciniate scales. 2n = 34.


Phenology: Flowering spring–fall.
Habitat: Limestone rock crevices
Elevation: 600–1300 m

Discussion

Perityle aglossa is consistently discoid and occurs in limestone crevices along and near the Rio Grande in Brewster and Terrell counties. A combination of subtle characteristics including shallower leaf lobing, narrower shape and more attenuate apices of the phyllaries, shorter cypselae, and proportionally longer pappus bristles distinguish these plants from the rayless ones of P. parryi.

Selected References

None.

Lower Taxa

None.
... more about "Perityle aglossa"
Sharon C. Yarborough +  and A. Michael Powell +
A. Gray +
Rayless rock daisy +  and bluff rock daisy +
Tex. +  and Mexico (Coahuila). +
600–1300 m +
Limestone rock crevices +
Flowering spring–fall. +
Smithsonian Contr. Knowl. +
Laphamia aglossa +
Perityle aglossa +
Perityle sect. Perityle +
species +