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

Lindheimer's Rock daisy

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.

Peduncles

10–45(–80) mm.

3–20 mm.

Involucres

campanulate.

narrowly campanulate.

Ray florets

0.

3–5;

corollas yellow, laminae oblong to suborbiculate, 2.5–3 × 1.5–2 mm.

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.

Phyllaries

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

12–14, narrowly lanceolate to oblanceolate, 3–4 × 2 mm.

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.

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.

Perityle megalocephala

Perityle lindheimeri

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.)

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.)

Key
1. Leaf blades ovate, lanceolate-ovate or elliptic to suborbiculate
var. megalocephala
1. Leaf blades linear to lanceolate
var. oligophylla
1. Pappi usually 0, sometimes of single bristles 0.5–1(–1.5) mm, usually plus obscure, callous crowns; w Edwards Plateau
var. halimifolia
1. Pappi usually of 1(–2) bristles 0.5–1.8 mm plus vestigial, laciniate scales or obscure callous crowns, rarely 0; c, e Edwards Plateau
var. lindheimeri
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
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. fosteri, P. gilensis, P. gracilis, P. huecoensis, P. intricata, P. inyoensis, P. lemmonii, 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
P. lindheimeri var. halimifolia, P. lindheimeri var. lindheimeri
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)
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