Pyrrocoma racemosa |
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cluster goldenweed, racemose pyrrocoma |
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Habit | Plants 20–75 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. |
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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. |
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Peduncles | 0–2 cm. |
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Involucres | hemispheric to campanulate, 5–15 × 5–18 mm. |
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Ray florets | 7–28; corollas 5–12 mm. |
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Disc florets | 20–65; corollas 5–8 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. |
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Heads | (1–)3–15+ in spiciform, racemiform, or narrowly 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. |
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Pyrrocoma racemosa |
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Distribution |
CA; ID; NV; OR; UT
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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.) |
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Key |
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Source | FNA vol. 20, p. 421. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Astereae > Pyrrocoma | ||||||||||||||||
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Synonyms | Homopappus racemosus, Haplopappus racemosus | ||||||||||||||||
Name authority | (Nuttall) Torrey & A. Gray: Fl. N. Amer. 2: 244. (1842) | ||||||||||||||||
Web links |