Perityle megalocephala |
Perityle cinerea |
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bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada Rock daisy |
gray rock daisy |
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Habit | Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous. | Plants 8–25(–45) cm (profusely branched, densely leafy); densely tomentose-canescent. | ||||
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 6–10 mm; blades usually broadly ovate to subdeltate, rarely subreniform, 6–15 × 6–18 mm, margins deeply serrate (veins conspicuous). |
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Peduncles | 10–45(–80) mm. |
3–10 mm. |
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Involucres | campanulate. |
narrowly campanulate. |
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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. |
10–15; corollas white, tubes 1–1.6 mm, throats tubular, 2.4–3.2 mm, lobes 0.6–1.2 mm. |
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Phyllaries | 14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm. |
8–16, linear-lanceolate to oblanceolate, 4–7 × 1–2 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, 8–10 × 4–7 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. |
2.6–3(–3.5) mm; pappi of (10–)14–20 bristles 1–3 mm. |
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2n | = ca. 136. |
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Perityle megalocephala |
Perityle cinerea |
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Phenology | Flowering spring–fall. | |||||
Habitat | Crevices, limestone caprock of mesas | |||||
Elevation | 800–1300 m (2600–4300 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 cinerea is found in Pecos, Terrell, and Upton counties. The relatively short, appressed habit seen in some populations may be the result of browsing by sheep. Perityle vitreomontana and P. rupestris var. albiflora are thought to be closely related to the uniquely tomentose-canescent P. cinerea. (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. 320. | ||||
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 | Laphamia cinerea, Pappothrix cinerea | ||||
Name authority | (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) | (A. Gray) A. M. Powell: Sida 3: 278. (1968) | ||||
Web links |