Pyrrocoma crocea
Pyrrocoma radiata
curly-head goldenweed
Ray goldenweed, Snake River goldenweed
2–10, erect or ascending, pale or reddish, often stout, usually glabrous, often tomentose distally.
1–8, usually erect, rarely curved-ascending, pale, rarely reddish, robust, glabrous, eglandular.
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.
basal (tufted), long-petiolate, blades (pale) broadly elliptic to obovate, 100–500 × 40–200 mm, rigid, margins entire or undulate, occasionally spinulose-serrate, eciliate;
cauline reduced and becoming sessile distally, margins entire or sharply spinulose-serrate;
faces glabrous.
1–5 cm.
2–7 cm.
hemispheric, 10–20 × 15–60 mm.
broadly hemispheric, 20–32 × 25–40 mm.
30–90;
corollas (bright yellow) 9–30 mm.
17–34;
corollas inconspicuous, 7–13 mm.
100+;
corollas 7–13 mm.
80–100;
corollas 10–15 mm.
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.
in 5–6 series, loosely appressed, ovate-oblong, unequal, margins pale, entire, eciliate, apices green, tip reflexed, faces glabrous.
usually borne singly, terminal, sometimes 2–6 (not subtended by leaflike bracts).
borne singly or 3–12 in short, open corymbiform arrays (subtended by leaflike bracts).
narrowly oblong, compressed, 5–8 mm, 4-angled, faces striate, glabrous;
pappi tawny, 6–12 mm.
subcylindric, 6–11 mm, 4-angled, faces glabrous;
pappi tawny or brownish, 9–13 mm.
= 36.
Pyrrocoma crocea
Pyrrocoma radiata
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.)
Pyrrocoma radiata is known only from the southern end of the Snake River canyon in Oregon and Idaho. It is considered endangered in Oregon. It is recognized by its large stature, glabrous herbage, and very large heads. It is most closely related to P. carthamoides and was formerly treated as a variety of that species. It is hexaploid and may be a gigas form of P. carthamoides.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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 |
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USDA Plants Database
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Flora NW
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