Flora of North America species comparison

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Pyrrocoma hirta

hairy goldenweed, large sticky goldenweed, sticky goldenweed, sticky pyrrocoma, tacky goldenweed
Habit Plants 10–60 cm.
Stems

1–4, erect or ascending, reddish, sometimes sparsely leafy, sparsely to densely villous, tomentose, or woolly, usually stipitate-glandular distally.
Leaves

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.
Peduncles

1–4 cm.
Involucres

hemispheric to campanulate, 7–12 × 8–20 mm.
Ray florets

10–34;

corollas 6–15 mm.
Disc florets

30–60;

corollas 5–7 mm.
Phyllaries

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.
Heads

usually 3–7 in loose, racemiform arrays, rarely borne singly (short- or long-pedunculate).
Cypselae

subcylindric, 3–4.5 mm, 3–4-angled, faces striate, sericeous-strigose;

pappi whitish to tawny, 5–7 mm.

Pyrrocoma hirta
Distribution
from FNA
CA; ID; NV; OR; UT; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)
Key
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
Source FNA vol. 20, p. 417.
Parent taxa Asteraceae > tribe Astereae > Pyrrocoma
Sibling taxa
P. apargioides, P. carthamoides, P. clementis, P. crocea, P. insecticruris, P. integrifolia, P. lanceolata, P. liatriformis, P. linearis, P. lucida, P. racemosa, P. radiata, P. uniflora
Subordinate taxa
P. hirta var. hirta, P. hirta var. sonchifolia, P. hirtavar. lanulosa
Synonyms Haplopappus hirtus
Name authority (A. Gray) Greene: Erythea 2: 69. (1894)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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