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curly-head goldenweed

Habit Plants (10–)18–80 cm.
Stems

2–10, erect or ascending, pale or reddish, often stout, usually glabrous, often tomentose distally.

Leaves

basal petiolate, blades oblanceolate to spatulate or narrowly elliptic, 80–450 × 5–60 mm (firm, leathery, succulent), margins entire or undulate, eciliate, apices acute or obtuse, faces usually glabrous, rarely puberulent, eglandular;

cauline sessile, blades lanceolate, 10–120 × 5–30 mm, bases clasping.

Peduncles

1–5 cm.

Involucres

hemispheric, 10–20 × 15–60 mm.

Ray florets

30–90;

corollas (bright yellow) 9–30 mm.

Disc florets

100+;

corollas 7–13 mm.

Phyllaries

in 2–3 series (loose), usually green, sometimes yellowish, oblong to spatulate, 9–15 mm, subequal, margins pale, entire or denticulate, eciliate, apices ± erect, obtuse, broad.

Heads

usually borne singly, terminal, sometimes 2–6 (not subtended by leaflike bracts).

Cypselae

narrowly oblong, compressed, 5–8 mm, 4-angled, faces striate, glabrous;

pappi tawny, 6–12 mm.

Pyrrocoma crocea

Distribution
from FNA
AZ; CO; NM; UT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

Pyrrocoma crocea is recognized by its thick stems, large, firm leaves, and large heads with oblong to spatulate phyllaries. H. M. Hall (1928) considered it the ancestral form of Pyrrocoma because of its large heads, numerous florets, long rays, and short style-branch appendages. R. A. Mayes (1976) suggested it is closely related to P. integrifolia.

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

Key
1. Plants 30–80 cm, robust; heads usually borne singly; involucres 15–20 × 20–40 mm; ray florets 13–30 mm
var. crocea
1. Plants 10–30 cm, slender; heads usually 2–6, occasionally 1; involucres 10–15 × 15–20 mm; ray florets 9–12 mm
var. genuflexa
Source FNA vol. 20, p. 417.
Parent taxa Asteraceae > tribe Astereae > Pyrrocoma
Sibling taxa
P. apargioides, P. carthamoides, P. clementis, P. hirta, P. insecticruris, P. integrifolia, P. lanceolata, P. liatriformis, P. linearis, P. lucida, P. racemosa, P. radiata, P. uniflora
Subordinate taxa
P. crocea var. crocea, P. crocea var. genuflexa
Synonyms Haplopappus croceus
Name authority (A. Gray) Greene: Erythea 2: 69. (1894)
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