Perityle megalocephala |
Perityle lindheimeri |
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bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada Rock daisy |
Lindheimer's 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, (10–)18–45(–60) cm; glabrate or sparsely 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 4–15 mm; blades broadly ovate to ovate-lanceolate, 10–40 × 10–35 mm, margins entire or serrate-lobed. |
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Peduncles | 10–45(–80) mm. |
3–20 mm. |
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Involucres | campanulate. |
narrowly campanulate. |
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Ray florets | 0. |
3–5; corollas yellow, laminae oblong to suborbiculate, 2.5–3 × 1.5–2 mm. |
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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. |
16–22; corollas yellow, tubes 0.8–1.5 mm, throats narrowly campanulate, 1–1.5 mm, lobes 0.5 mm. |
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Phyllaries | 14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm. |
12–14, narrowly lanceolate to oblanceolate, 3–4 × 2 mm. |
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Heads | borne singly or (2–3) in loose, corymbiform arrays, 6–9(–10) × 5–6(–8) mm. |
in corymbiform arrays, 6–7 × 4–6 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. |
linear-oblong to narrowly oblanceolate, 2–2.8 mm, margins thin-calloused, minutely hairy; pappi 0, or of 1(–2) bristles 0.5–1.8 mm. |
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Perityle megalocephala |
Perityle lindheimeri |
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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.) |
Varieties 2 (2 in the flora). A specimen resembling Perityle lindheimeri was collected in 1936 near Ruidosa in Lincoln County, New Mexico. The identity and exact location of that seemingly out-of-place collection remain to be determined. (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. 332. | ||||||||
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 | Laphamia lindheimeri, Laphamia rotundata, P. rotundata | ||||||||
Name authority | (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) | (A. Gray) Shinners: SouthW. Naturalist 4: 204. (1959) | ||||||||
Web links |