Pyrrocoma crocea
Pyrrocoma liatriformis
curly-head goldenweed
Palouse goldenweed, smallhead goldenweed
2–10, erect or ascending, pale or reddish, often stout, usually glabrous, often tomentose distally.
1–3, erect, sometimes curved-ascending, sparsely villous to tomentose, 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 blades lanceolate to oblanceolate, 80–310 × 9–30 mm, margins entire or undulate, ciliate;
cauline sessile, blades lanceolate, 30–120 × 5–20 mm;
faces sparsely tomentose, eglandular.
1–5 cm.
0–3 cm.
hemispheric, 10–20 × 15–60 mm.
campanulate, 10–23 × 12–20 mm (in axils of leafy bract).
30–90;
corollas (bright yellow) 9–30 mm.
17–25;
corollas 6–14.5 mm.
100+;
corollas 7–13 mm.
35–60;
corollas 7–11 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 4–5 series, green, lanceolate, 5–12 mm, unequal, margins entire, ciliate, apices acute, faces villous.
usually borne singly, terminal, sometimes 2–6 (not subtended by leaflike bracts).
4–12 in open, racemiform arrays.
narrowly oblong, compressed, 5–8 mm, 4-angled, faces striate, glabrous;
pappi tawny, 6–12 mm.
narrowly oblong, 4.5–6.5 mm, 4-angled, faces striate, villous;
pappi tawny, 5.8–8 mm.
= 36.
Pyrrocoma crocea
Pyrrocoma liatriformis
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.)
Of conservation concern.
Pyrrocoma liatriformis is one of the dominants of virgin Palouse prairies and appears to be threatened. It is recognized by its hirsute stems, leaves, and phyllaries, and the small, pedunculate heads.
(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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Flora NW
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