Perityle megalocephala |
Perityle specuicola |
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bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada Rock daisy |
alcove rockdaisy, hanging-garden or alcove rock daisy |
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Habit | Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous. | Perennials or subshrubs, 30–75 cm (sprawling or pendulous, much branched, sparsely leafy); hispidulous. | ||||
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. |
(mostly alternate): petioles 1–3(–8) mm; blades ovate to elliptic, 2–8 × 1–5 mm, margins entire. |
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Peduncles | 10–45(–80) mm. |
4–70 mm. |
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Involucres | campanulate. |
campanulate. |
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Ray florets | 0. |
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. |
30–60; corollas yellow, tubes 0.5–0.8 mm, throats broadly tubular, 1.3–1.8 mm, lobes 0.4–0.6 mm. |
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Phyllaries | 14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm. |
11–16, lanceolate to oblanceolate, 3.5–5 × 0.5–1 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, 3.5–5 × 5–6 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. |
narrowly oblanceolate, 3–3.8 mm, faces glabrous, margins thin-calloused, relatively long-ciliate; pappi usually of 1–3(–4) unequal bristles 1–2.5 mm, rarely 0. |
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Perityle megalocephala |
Perityle specuicola |
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Phenology | Flowering spring–fall. | |||||
Habitat | Rock crevices and faces along rivers and seeps | |||||
Elevation | 1100–2300 m (3600–7500 ft) | |||||
Distribution |
CA; NV
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UT |
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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 specuicola, which resembles P. megalocephala and P. stansburii in having relatively small, sparse leaves, is found only in “hanging gardens” along streams and near seeps in Grand and San Juan counties. The stems of this rayless species are usually sprawling and long-pendent, the cypsela margins are thin and long-ciliate, and the pappi are of 1–4 bristles. (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. 327. | ||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Laphamia | Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Laphamia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Laphamia megalocephala | |||||
Name authority | (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) | S. L. Welsh & Neese: Great Basin Naturalist 43: 373. (1983) | ||||
Web links |