Perityle emoryi |
Perityle aglossa |
|
---|---|---|
Emory's Rock daisy |
bluff rock daisy, rayless rock daisy |
|
Habit | Annuals (sometimes persisting), 2–60 cm (delicate or robust, stems relatively few to many, erect or spreading); puberulent to hirsute, glandular-pubescent. | Perennials or subshrubs, 15–45 cm (in rock crevices); glandular-pubescent. |
Leaves | petioles 3–45 mm; blades ovate, cordate, suborbiculate, or triangular, 17–60 × 10–50 mm, margins deeply toothed, lobed, cleft, or divided, lobes indented to irregularly dissected. |
petioles 8–23 mm; blades ovate, subcordate, or subdeltate, 6–20 × 5–25 mm, margins irregularly lobed, laciniate, serrate-dentate, or shallowly 3-lobed. |
Peduncles | 1–70 mm. |
10–25 mm. |
Involucres | campanulate to hemispheric. |
campanulate. |
Ray florets | usually 8–14, rarely rudimentary or 0; corollas white, laminae oblong, 1–4(–6) × 1–3 mm. |
0. |
Disc florets | 40–100+; corollas yellow, tubes 0.7–1.3 mm, throats tubular to tubular-funnelform, 0.8–1.3 mm, lobes 0.1–0.2 mm. |
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. |
Phyllaries | 10–20, lanceolate or oblanceolate to ovate-lanceolate, 4–6 × 1–2 mm. |
14–24, linear to linear-lanceolate, (5–)6–10 × 0.5–1 mm, apices long-attenuate. |
Heads | borne singly or in corymbiform arrays, 4–10 × 4–10 mm. |
borne singly or (2–3) in corymbiform arrays, 8–11 × 4–8 mm. |
Cypselae | suboblong, oblanceolate, or subcuneate, (1.5–)2–3 mm, margins thin (not calloused), long- or short-ciliate; pappi 0 or of 1 antrorsely to retrorsely barbellate bristles 1–3 mm plus crowns of hyaline, laciniate scales. |
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 | = 65–72 or 100–116. |
= 34. |
Perityle emoryi |
Perityle aglossa |
|
Phenology | Flowering year round (depending on latitude). | Flowering spring–fall. |
Habitat | Coastal bluffs, desert plains, slopes, washes | Limestone rock crevices |
Elevation | 10–1500 m (0–4900 ft) | 600–1300 m (2000–4300 ft) |
Distribution |
AZ; CA; NV; UT; Mexico; South America (Chile, Peru)
|
TX; Mexico (Coahuila) |
Discussion | Perityle emoryi is a widespread polyploid of diverse habitats and is often weedy. It is variable; none of the variation appears to have population significance and does not require taxonomic recognition. The range of P. emoryi appears to be gradually expanding. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 321. | FNA vol. 21, p. 323. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Perityle | Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Perityle |
Sibling taxa | ||
Synonyms | Laphamia aglossa | |
Name authority | Torrey: in W. H. Emory, Not. Milit. Reconn., 142. (1848) | A. Gray: Smithsonian Contr. Knowl. 5(6): 107. (1853) |
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