Packera streptanthifolia |
Packera antennariifolia |
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cleftleaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel |
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Habit | Plants perennial, 20–50+ cm; caudices weak or stout, horizontal or suberect and fibrous-rooted. | |
Stems | 1 or 2–5, clustered, glabrous or sometimes sparsely pubescent near base and in leaf axils. |
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Basal leaves | blades oblanceolate to orbiculate; thick; turgid, bases tapering to contracted; margins dentate, dissected; entire, subentire or weakly lobulate; surfaces usually glabrous, sometimes pubescent, petiolate. |
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Cauline leaves | similar to basal, gradually reduced, petiolate or sessile. |
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Involucres | campanulate. |
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Ray florets | 8 or 13; rays 5–10 mm. |
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Disc florets | 35–60; corolla tubes 2–4 mm; limbs 2.5–4 mm. |
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Phyllaries | (8)13 or 21, 4–7+ mm, green; tips sometimes anthocyanic; surfaces glabrous. |
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Calyculi | conspicuous. |
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Fruits | 1–2.5 mm, glabrous; pappi 3–6 mm. |
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Heads | 2–20+; in corymb- or subumbel-like arrays; peduncles glabrous or sparsely tomentose, bracteate. |
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2n | =46, 92. |
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Packera streptanthifolia |
Packera antennariifolia |
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Distribution | ||
Discussion | Forests, open meadows, and valleys in dry to damp loamy soils. Flowering May–Aug. 400–2900 m. BR, BW, ECas, Lava, Owy, Sisk. ID, NV, WA; north to Yukon, northeast to Saskatchewan, east to WY, southeast to NM. Native. Packera streptanthifolia includes weakly defined “phases” that have been treated as distinct species or as varieties. Characteristics used to define those taxa often overlap and are difficult to distinguish; some phases grade into each other. |
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Source | Flora of Oregon, volume 2, page 324 Debra Trock |
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Sibling taxa | ||
Synonyms | Packera streptanthifolia var. streptanthifolia, Senecio cymbalarioides, Senecio leonardii, Senecio streptanthifolius | |
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