Pyrrocoma racemosa
Pyrrocoma liatriformis
cluster goldenweed, racemose pyrrocoma
Palouse goldenweed, smallhead goldenweed
2–5, erect or strongly ascending, brownish to red-tinged, bases often curved, sparsely to moderately leafy, usually glabrous, sometimes sparsely tomentulose or villous, eglandular.
1–3, erect, sometimes curved-ascending, sparsely villous to tomentose, eglandular.
basal (tufted) petiolate, blades lanceolate or oblanceolate to elliptic, 50–200(–300) × 4–30 mm, margins spinulose-serrate to entire or undulate, ciliate, apices acute, sometimes recurved;
cauline sessile, blades lanceolate, 10–40 × 2–4 mm, reduced distally;
faces usually glabrous, sometimes villous.
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.
0–2 cm.
0–3 cm.
hemispheric to campanulate, 5–15 × 5–18 mm.
campanulate, 10–23 × 12–20 mm (in axils of leafy bract).
7–28;
corollas 5–12 mm.
17–25;
corollas 6–14.5 mm.
20–65;
corollas 5–8 mm.
35–60;
corollas 7–11 mm.
in 4–5 series, lanceolate to oblanceolate or oblong, 6–13 mm, strongly unequal, margins sometimes ciliate, apices green, obtuse or acute, sometimes recurved, faces glabrous, sparsely tomentulose, or densely villous.
in 4–5 series, green, lanceolate, 5–12 mm, unequal, margins entire, ciliate, apices acute, faces villous.
(1–)3–15+ in spiciform, racemiform, or narrowly paniculiform arrays.
4–12 in open, racemiform arrays.
subcylindric, 2.5–5.5 mm, 4-angled, faces often sericeous or nearly glabrous;
pappi tawny, 6.5–8.5 mm.
narrowly oblong, 4.5–6.5 mm, 4-angled, faces striate, villous;
pappi tawny, 5.8–8 mm.
= 36.
Pyrrocoma racemosa
Pyrrocoma liatriformis
Varieties 5 (5 in the flora).
Pyrrocoma racemosa is generally recognized by its erect stems, tufted leaves, and few to many heads in elongate, racemiform or spiciform arrays. It is the most variable species of Pyrrocoma, with numerous named varieties and subspecies. R. A. Mayes (1976) suggested that P. racemosa is closely related to the small-headed, racemiform species P. uniflora, P. apargioides, and P. lucida. The varieties are intergrading, making them somewhat difficult to identify.
(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. Involucres 10–15 mm | → 2 |
1. Involucres 5–9 mm | → 3 |
2. Stems villous; basal leaf blades lanceolate; phyllaries densely villous | var. pinetorum |
2. Stems usually glabrous, rarely tomentulose; basal leaf blades oblanceolate to elliptic; phyllaries glabrous | var. racemosa |
3. Arrays narrowly paniculiform, racemiform, or spiciform, heads crowded only distally | var. paniculata |
3. Arrays usually glomerate-spiciform, heads crowded | → 4 |
4. Involucre 12–16 mm wide; phyllaries yellowish green, apices erect, faces sparsely tomentose at least proximally | var. congesta |
4. Involucre 5–7 mm wide; phyllaries with pale chartaceous bases, apices recurved, green, faces glabrous | var. sessiliflora |
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
WA
