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

Foster's Rock daisy

Habit Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous. Plants 6–15 cm (forming mats on rock faces, profusely branched, leafy); short-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 4–8 mm;

blades ± ovate to deltate overall, 5–12 × 5–12 mm, 3-lobed, ultimate margins entire.

Peduncles

10–45(–80) mm.

2–5 mm.

Involucres

campanulate.

funnelform-cylindric.

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.

ca. 10;

corollas cream to pale yellow, tubes 1 mm, throats tubular-funnelform, 3 mm, lobes 0.5 mm.

Phyllaries

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

ca. 8, linear-lanceolate, 5–6 × 0.8–1.3 mm.

Heads

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

borne singly or in corymbiform arrays, 6–7 × ca. 4 mm.

Cypselae

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

pappi 0, or of single bristles.

1.5–1.6 mm;

pappi of ca. 20 bristles 1–2 mm.

2n

= 34.

Perityle megalocephala

Perityle fosteri

Phenology Flowering spring–fall.
Habitat Rock faces in protected canyons
Elevation 1500–1660 m (4900–5400 ft)
Distribution
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
from FNA
TX
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

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

Of conservation concern.

Perityle fosteri, possibly a close relative of P. rupestris, is known only from Culberson County.

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

Key
1. Leaf blades ovate, lanceolate-ovate or elliptic to suborbiculate
var. megalocephala
1. Leaf blades linear to lanceolate
var. oligophylla
Source FNA vol. 21, p. 326. FNA vol. 21, p. 319.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Laphamia Asteraceae > tribe Heliantheae > subtribe Peritylinae > Perityle > sect. Pappothrix
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
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. gilensis, P. gracilis, P. huecoensis, P. intricata, P. inyoensis, P. lemmonii, P. lindheimeri, P. megalocephala, 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
Synonyms Laphamia megalocephala
Name authority (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) A. M. Powell: Madroño 30: 217, fig. 1. (1983)
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