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bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada rockdaisy

Habit Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous.
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.

Peduncles

10–45(–80) mm.

Heads

borne singly or (2–3) in loose, corymbiform arrays, 6–9(–10) × 5–6(–8) mm.

Involucres

campanulate.

Ray florets

0.

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.

Phyllaries

14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm.

Cypselae

narrowly oblanceolate to suboblanceolate, 2.5–3 mm, margins thin-calloused, short-hairy;

pappi 0, or of single bristles.

Perityle megalocephala

Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Distribution
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
Parent taxa Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Laphamia
Sibling taxa
P. aglossa, P. ajoensis, P. ambrosiifolia, P. angustifolia, P. bisetosa, P. cernua, P. ciliata, P. cinerea, P. cochisensis, P. congesta, P. coronopifolia, P. dissecta, P. emoryi, P. fosteri, P. gilensis, P. gracilis, P. huecoensis, P. intricata, P. inyoensis, P. lemmonii, P. lindheimeri, P. microglossa, P. parryi, P. quinqueflora, P. rupestris, P. saxicola, P. specuicola, P. stansburyi, P. staurophylla, P. tenella, P. vaseyi, P. villosa, P. vitreomontana, P. warnockii
Subordinate taxa
P. megalocephala var. megalocephala, P. megalocephala var. oligophylla
Key
1.Leaf blades ovate, lanceolate-ovate or elliptic to suborbiculateP. megalocephala var. megalocephala
1.Leaf blades linear to lanceolateP. megalocephala var. oligophylla
Synonyms Laphamia megalocephala
Name authority (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918)
Source Flora of North America vol. 21, p. 326.
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