Packera streptanthifolia |
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cleft-leaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel |
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Habit | Perennials, 10–50+ cm; fibrous-rooted (caudices weak to stout, horizontal to suberect). |
Stems | 1 or 2–5, clustered, usually glabrous, sometimes sparsely floccose-tomentose proximally and in leaf axils. |
Basal leaves | (and proximal cauline, relatively thick and turgid) petiolate; blades spatulate to oblanceolate, or ovate to orbiculate, 20–40+ × 10–30+ mm, bases tapering to abruptly contracted or subcordate, margins entire, crenate, dentate, or weakly lobulate (faces usually glabrous, sometimes hairy). |
Cauline leaves | gradually to abruptly reduced (± petiolate or sessile; entire or subentire). |
Peduncles | bracteate, glabrous or sparsely tomentose. |
Ray florets | 8 or 13; corolla laminae 5–10 mm. |
Disc florets | 35–60+; corolla tubes 2–4 mm, limbs 2.5–4 mm. |
Phyllaries | (8–)13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous. |
Calyculi | conspicuous. |
Heads | 2–20+ in loose, corymbiform or subumbelliform arrays. |
Cypselae | 1–2.5 mm, glabrous; pappi 3–6 mm. |
2n | = 46, 92. |
Packera streptanthifolia |
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Phenology | Flowering late May–late Aug. |
Habitat | Forests, open meadows, valleys, dry to damp and loamy soils |
Elevation | 1000–3400 m (3300–11200 ft) |
Distribution |
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT; SK; YT
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Discussion | Packera streptanthifolia is widespread and variable throughout the Western Cordillera. It includes weakly defined phases that have been treated as distinct species or as varieties. Characteristics used to delimit those taxa often overlap and are difficult to score; some “phases” grade into each other. Northern populations are sometimes segregated as a distinct taxon (e.g., Senecio streptanthifolia var. borealis; J. F. Bain 1988). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 599. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | |
Synonyms | Senecio streptanthifolius, P. streptanthifolia var. borealis, Senecio adamsii, Senecio aureus var. borealis, Senecio cognatus, Senecio cymbalarioides, Senecio cymbalarioides var. borealis, Senecio cymbalarioides var. streptanthifolius, Senecio fulgens, Senecio jonesii, Senecio leonardii, Senecio longipetiolatus, Senecio oödes, Senecio platylobus, Senecio rydbergii, Senecio streptanthifolius var. borealis, Senecio streptanthifolius var. kluanei, Senecio streptanthifolius var. laetiflorus, Senecio streptanthifolius var. oödes, Senecio streptanthifolius var. rubricaulis, Senecio streptanthifolius var. wallowensis, Senecio subcuneatus, Senecio suksdorfii, Senecio wardii |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) |
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