Perityle megalocephala |
Perityle fosteri |
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bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada Rock daisy |
Foster's Rock daisy |
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Habit | Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous. | Plants 6–15 cm (forming mats on rock faces, profusely branched, leafy); short-hairy. | ||||
Leaves | petioles 1–6 mm; blades usually elliptic, lanceolate, lance-ovate, ovate, or suborbiculate, sometimes linear, 4–8(–15) × 1–10(–12) mm, margins entire, irregularly and sparsely serrate, or serrate-lobed. |
petioles 4–8 mm; blades ± ovate to deltate overall, 5–12 × 5–12 mm, 3-lobed, ultimate margins entire. |
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Peduncles | 10–45(–80) mm. |
2–5 mm. |
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Involucres | campanulate. |
funnelform-cylindric. |
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Ray florets | 0. |
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Disc florets | 45–60; corollas yellow, tubes 1–1.6 mm, throats tubular to subfunnelform, 1.6–2.2 mm, lobes 0.4–0.7 mm. |
ca. 10; corollas cream to pale yellow, tubes 1 mm, throats tubular-funnelform, 3 mm, lobes 0.5 mm. |
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Phyllaries | 14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm. |
ca. 8, linear-lanceolate, 5–6 × 0.8–1.3 mm. |
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Heads | borne singly or (2–3) in loose, corymbiform arrays, 6–9(–10) × 5–6(–8) mm. |
borne singly or in corymbiform arrays, 6–7 × ca. 4 mm. |
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Cypselae | narrowly oblanceolate to suboblanceolate, 2.5–3 mm, margins thin-calloused, short-hairy; pappi 0, or of single bristles. |
1.5–1.6 mm; pappi of ca. 20 bristles 1–2 mm. |
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2n | = 34. |
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Perityle megalocephala |
Perityle fosteri |
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Phenology | Flowering spring–fall. | |||||
Habitat | Rock faces in protected canyons | |||||
Elevation | 1500–1660 m (4900–5400 ft) | |||||
Distribution |
CA; NV
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TX |
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Perityle fosteri, possibly a close relative of P. rupestris, is known only from Culberson County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 326. | FNA vol. 21, p. 319. | ||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Laphamia | Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Pappothrix | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Laphamia megalocephala | |||||
Name authority | (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) | A. M. Powell: Madroño 30: 217, fig. 1. (1983) | ||||
Web links |