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

Organ Mountain Rock daisy

Habit Perennials or subshrubs, 15–55 cm (often dense, profusely branched clumps, sparsely leafy); densely hirtellous. Plants 3–12(–20) cm (closely appressed to rocks); glabrate or with transparent, multicellular hairs on petioles, peduncles, and phyllaries.
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 7–25 mm;

blades ovate-reniform to ovate-cordate, 10–40 × 8–40 mm, margins unevenly serrate-dentate.

Peduncles

10–45(–80) mm.

10–19 mm.

Involucres

campanulate.

broadly 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.

20–150;

corollas yellow, tubes 1.2–2 mm, throats narrowly funnelform, 2–3.3 mm, lobes 0.7–0.8 mm.

Phyllaries

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

18–28, linear-lanceolate, 6–9 × 1.2–2 mm.

Heads

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

borne singly (nodding or erect), 10–12 × 12–14 mm.

Cypselae

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

pappi 0, or of single bristles.

2.1–3 mm;

pappi of 25–35 bristles 0.5–1.5(–2) mm.

2n

= 34 + 1 frag.

Perityle megalocephala

Perityle cernua

Phenology Flowering spring–fall.
Habitat Limestone or igneous cliffs and slopes
Elevation 1600–3000 m (5200–9800 ft)
Distribution
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
from FNA
NM
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

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

Of conservation concern.

Perityle cernua is known only from the Organ Mountains of Doña Ana 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. 318.
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. 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. 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 cernua
Name authority (S. Watson) J. F. Macbride: Contr. Gray Herb. 56: 39. (1918) (Greene) Shinners: SouthW. Naturalist 4: 204. (1959)
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