Pyrrocoma hirta |
Pyrrocoma liatriformis |
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hairy goldenweed, large sticky goldenweed, sticky goldenweed, sticky pyrrocoma, tacky goldenweed |
Palouse goldenweed, smallhead goldenweed |
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Habit | Plants 10–60 cm. | Plants 25–70 cm. | ||||||||
Stems | 1–4, erect or ascending, reddish, sometimes sparsely leafy, sparsely to densely villous, tomentose, or woolly, usually stipitate-glandular distally. |
1–3, erect, sometimes curved-ascending, sparsely villous to tomentose, eglandular. |
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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. |
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. |
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Peduncles | 1–4 cm. |
0–3 cm. |
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Involucres | hemispheric to campanulate, 7–12 × 8–20 mm. |
campanulate, 10–23 × 12–20 mm (in axils of leafy bract). |
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Ray florets | 10–34; corollas 6–15 mm. |
17–25; corollas 6–14.5 mm. |
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Disc florets | 30–60; corollas 5–7 mm. |
35–60; corollas 7–11 mm. |
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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. |
in 4–5 series, green, lanceolate, 5–12 mm, unequal, margins entire, ciliate, apices acute, faces villous. |
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Heads | usually 3–7 in loose, racemiform arrays, rarely borne singly (short- or long-pedunculate). |
4–12 in open, racemiform arrays. |
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Cypselae | subcylindric, 3–4.5 mm, 3–4-angled, faces striate, sericeous-strigose; pappi whitish to tawny, 5–7 mm. |
narrowly oblong, 4.5–6.5 mm, 4-angled, faces striate, villous; pappi tawny, 5.8–8 mm. |
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2n | = 36. |
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Pyrrocoma hirta |
Pyrrocoma liatriformis |
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Phenology | Flowering Jul–Aug. | |||||||||
Habitat | Prairies, roadsides | |||||||||
Elevation | 700–1100 m (2300–3600 ft) | |||||||||
Distribution |
CA; ID; NV; OR; UT; WA
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ID; WA
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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.) |
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.) |
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Key |
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Source | FNA vol. 20, p. 417. | FNA vol. 20, p. 420. | ||||||||
Parent taxa | Asteraceae > tribe Astereae > Pyrrocoma | Asteraceae > tribe Astereae > Pyrrocoma | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Haplopappus hirtus | Haplopappus integrifolius subsp. liatriformis, Haplopappus integrifolius subsp. scaberulus, Haplopappus liatriformis, Haplopappus racemosus subsp. liatriformis | ||||||||
Name authority | (A. Gray) Greene: Erythea 2: 69. (1894) | Greene: Leafl. Bot. Observ. Crit. 2: 17. (1909) | ||||||||
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