Perityle megalocephala |
Perityle cernua |
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bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada Rock daisy |
Organ Mountain Rock daisy |
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Habit | Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous. | Plants 3–12(–20) cm (closely appressed to rocks); glabrate or with transparent, multicellular hairs on petioles, peduncles, and phyllaries. | ||||
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 7–25 mm; blades ovate-reniform to ovate-cordate, 10–40 × 8–40 mm, margins unevenly serrate-dentate. |
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Peduncles | 10–45(–80) mm. |
10–19 mm. |
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Involucres | campanulate. |
broadly 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. |
20–150; corollas yellow, tubes 1.2–2 mm, throats narrowly funnelform, 2–3.3 mm, lobes 0.7–0.8 mm. |
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Phyllaries | 14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm. |
18–28, linear-lanceolate, 6–9 × 1.2–2 mm. |
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Heads | borne singly or (2–3) in loose, corymbiform arrays, 6–9(–10) × 5–6(–8) mm. |
borne singly (nodding or erect), 10–12 × 12–14 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. |
2.1–3 mm; pappi of 25–35 bristles 0.5–1.5(–2) mm. |
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2n | = 34 + 1 frag. |
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Perityle megalocephala |
Perityle cernua |
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Phenology | Flowering spring–fall. | |||||
Habitat | Limestone or igneous cliffs and slopes | |||||
Elevation | 1600–3000 m (5200–9800 ft) | |||||
Distribution |
CA; NV
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NM |
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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 cernua is known only from the Organ Mountains of Doña Ana 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. 318. | ||||
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 cernua | ||||
Name authority | (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) | (Greene) Shinners: SouthW. Naturalist 4: 204. (1959) | ||||
Web links |