Pyrrocoma racemosa
Pyrrocoma hirta
cluster goldenweed, racemose pyrrocoma
hairy goldenweed, large sticky goldenweed, sticky goldenweed, sticky pyrrocoma, tacky 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.
1–4, erect or ascending, reddish, sometimes sparsely leafy, sparsely to densely villous, tomentose, or woolly, usually stipitate-glandular distally.
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 petiolate, blades lanceolate to oblanceolate or elliptic, 40–200 × 8–45 mm, margins usually coarsely, sharply serrate, sometimes entire, frequently stipitate-glandular, sometimes ciliate, apices acute, faces villous to tomentose, sometimes stipitate-glandular;
cauline petiolate, lanceolate, 15–75 × 3–20 mm, becoming sessile and reduced distally, bases clasping.
0–2 cm.
1–4 cm.
hemispheric to campanulate, 5–15 × 5–18 mm.
hemispheric to campanulate, 7–12 × 8–20 mm.
7–28;
corollas 5–12 mm.
10–34;
corollas 6–15 mm.
20–65;
corollas 5–8 mm.
30–60;
corollas 5–7 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 2–3 series, loose or appressed, green throughout or only distally (bases chartaceous), linear-lanceolate, unequal to subequal, apices acute, faces villous to tomentose, sometimes stipitate-glandular.
(1–)3–15+ in spiciform, racemiform, or narrowly paniculiform arrays.
usually 3–7 in loose, racemiform arrays, rarely borne singly (short- or long-pedunculate).
subcylindric, 2.5–5.5 mm, 4-angled, faces often sericeous or nearly glabrous;
pappi tawny, 6.5–8.5 mm.
subcylindric, 3–4.5 mm, 3–4-angled, faces striate, sericeous-strigose;
pappi whitish to tawny, 5–7 mm.
Pyrrocoma racemosa
Pyrrocoma hirta
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 3 (3 in the flora).
Pyrrocoma hirta is recognized by its relatively short stature, villous, glandular-stipitate stems, lanceolate, coarsely serrate leaves, and loose, racemiform arrays. R. A. Mayes (1976) suggested that it is closely related to P. lanceolata. Much overlap occurs in the characters used to differentiate the varieties.
(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 |
1. Stems villous or tomentose, ± woolly, sparsely stipitate-glandular; phyllaries appressed, unequal, green only distally | P. hirtavar. lanulosa |
1. Stems glabrate or sparsely villous, densely stipitate-glandular; phyllaries loose, subequal, green throughout | → 2 |
2. Basal leaves 50–200 × 15–45 mm, faces glabrate to sparsely villous; involucres 8–12 × 12–20 mm | var. sonchifolia |
2. Basal leaves 40–80(–160) × 10–30 mm, faces densely villous; involucres 7–11 × 8–15 mm | var. hirta |
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