Pyrrocoma racemosa |
Pyrrocoma lanceolata |
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cluster goldenweed, racemose pyrrocoma |
intermountain pyrrocoma, lance-leaf goldenweed |
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Habit | Plants 20–75 cm. | Plants 20–50 cm. | ||||||||||||||||||||
Stems | 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. |
1–10, decumbent to ascending or erect, red-tinged, sometimes branched, sparsely leafy, ± tomentulose or glabrous, sometimes stipitate-glandular. |
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Leaves | 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 or rarely oblanceolate to narrowly elliptic, 50–300 × 8–30 mm, margins sharply dentate, eciliate, apices acute, spinulose; cauline sessile, lanceolate, bases clasping; faces ± tomentulose to glabrate or glabrous, sometimes stipitate-glandular. |
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Peduncles | 0–2 cm. |
0–6 cm. |
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Involucres | hemispheric to campanulate, 5–15 × 5–18 mm. |
hemispheric, 7–10 × 10–18 mm. |
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Ray florets | 7–28; corollas 5–12 mm. |
18–45; corollas 6–11 mm. |
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Disc florets | 20–65; corollas 5–8 mm. |
20–100; corollas 5–7 mm. |
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Phyllaries | 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 3–4 series, linear-lanceolate to lanceolate, 3–11 mm, unequal, bases white-chartaceous, margins entire, eciliate, apices conspicuously green, faces glabrous or tomentulose, rarely stipitate-glandular. |
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Heads | (1–)3–15+ in spiciform, racemiform, or narrowly paniculiform arrays. |
(1–)4–20(–50) in corymbiform or paniculiform arrays. |
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Cypselae | subcylindric, 2.5–5.5 mm, 4-angled, faces often sericeous or nearly glabrous; pappi tawny, 6.5–8.5 mm. |
oblong, 3.5–4.5 mm, 4-angled, faces striate, sericeous; pappi tawny, 5–7 mm. |
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Pyrrocoma racemosa |
Pyrrocoma lanceolata |
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Distribution |
CA; ID; NV; OR; UT
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CA; CO; ID; MT; ND; NE; NV; OR; TX; UT; WY; AB; SK
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Discussion | 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.) |
Varieties 2 (2 in the flora). Pyrrocoma lanceolata has the widest range of any species and exhibits much variability in habit and head size. A number of infraspecific taxa have been recognized in the past; only two were retained by R. A. Mayes (1976). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 421. | FNA vol. 20, p. 419. | ||||||||||||||||||||
Parent taxa | Asteraceae > tribe Astereae > Pyrrocoma | Asteraceae > tribe Astereae > Pyrrocoma | ||||||||||||||||||||
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Synonyms | Homopappus racemosus, Haplopappus racemosus | Donia lanceolata, Haplopappus lanceolatus | ||||||||||||||||||||
Name authority | (Nuttall) Torrey & A. Gray: Fl. N. Amer. 2: 244. (1842) | (Hooker) Greene: Erythea 2: 69. (1894) | ||||||||||||||||||||
Web links |