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

gray rock daisy

Habit Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous. Plants 8–25(–45) cm (profusely branched, densely leafy); densely tomentose-canescent.
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 6–10 mm;

blades usually broadly ovate to subdeltate, rarely subreniform, 6–15 × 6–18 mm, margins deeply serrate (veins conspicuous).

Peduncles

10–45(–80) mm.

3–10 mm.

Involucres

campanulate.

narrowly 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.

10–15;

corollas white, tubes 1–1.6 mm, throats tubular, 2.4–3.2 mm, lobes 0.6–1.2 mm.

Phyllaries

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

8–16, linear-lanceolate to oblanceolate, 4–7 × 1–2 mm.

Heads

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

borne singly or in corymbiform arrays, 8–10 × 4–7 mm.

Cypselae

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

pappi 0, or of single bristles.

2.6–3(–3.5) mm;

pappi of (10–)14–20 bristles 1–3 mm.

2n

= ca. 136.

Perityle megalocephala

Perityle cinerea

Phenology Flowering spring–fall.
Habitat Crevices, limestone caprock of mesas
Elevation 800–1300 m (2600–4300 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 cinerea is found in Pecos, Terrell, and Upton counties. The relatively short, appressed habit seen in some populations may be the result of browsing by sheep. Perityle vitreomontana and P. rupestris var. albiflora are thought to be closely related to the uniquely tomentose-canescent P. cinerea.

(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. 320.
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. 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. 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 Laphamia cinerea, Pappothrix cinerea
Name authority (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) (A. Gray) A. M. Powell: Sida 3: 278. (1968)
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