Perityle emoryi |
Perityle vaseyi |
|
---|---|---|
Emory's Rock daisy |
Vasey's 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, (10–)15–75 cm (in soil, tap roots fleshy, stems erect or spreading); 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 10–35 mm; blades usually palmately 3-lobed or ± cruciform, 6–35 × 10–50 mm, lobes usually again ternately dissected, cleft, or parted. |
Peduncles | 1–70 mm. |
10–80 mm. |
Involucres | campanulate to hemispheric. |
campanulate to hemispheric. |
Ray florets | usually 8–14, rarely rudimentary or 0; corollas white, laminae oblong, 1–4(–6) × 1–3 mm. |
12–18; corollas yellow, laminae oblong, 4–10 × 2–4 mm. |
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. |
50–100; corollas yellow, tubes 1.2–1.5 mm, throats tubular to broadly tubular, 2.2–3 mm, lobes 0.4–0.6 mm. |
Phyllaries | 10–20, lanceolate or oblanceolate to ovate-lanceolate, 4–6 × 1–2 mm. |
20–30, oblanceolate or lanceolate to linear-lanceolate, 6–7 × 1–2 mm, apices usually acute, sometimes short-attenuate. |
Heads | borne singly or in corymbiform arrays, 4–10 × 4–10 mm. |
borne singly or (2–3) in corymbiform arrays, 8–10 × 10–13 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. |
linear-elliptic to narrowly oblanceolate, (2–)3–4 mm, margins usually prominently calloused, sometimes thin, usually densely ciliate, sometimes short-hairy; pappi 0 or of 1(–2) retrorsely or erectly barbellate (at least near tips) bristles 1–4 mm plus crowns of hyaline, laciniate scales. |
2n | = 65–72 or 100–116. |
= 34. |
Perityle emoryi |
Perityle vaseyi |
|
Phenology | Flowering year round (depending on latitude). | Flowering year around. |
Habitat | Coastal bluffs, desert plains, slopes, washes | Desert soils, especially gypsiferous clays |
Elevation | 10–1500 m (0–4900 ft) | 700–1800 m (2300–5900 ft) |
Distribution |
AZ; CA; NV; UT; Mexico; South America (Chile, Peru)
|
TX; Mexico (Chihuahua, 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 vaseyi is always found growing in soil, often on roadsides and in road cuts in the southwestern Big Bend area. The more deeply dissected leaves, shorter pappus bristles with barbellate tips, and broader phyllaries help distinguish it from the soil-growing form 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 | ||
Name authority | Torrey: in W. H. Emory, Not. Milit. Reconn., 142. (1848) | J. M. Coulter: Contr. U.S. Natl. Herb. 1: 42. (1890) |
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