Packera streptanthifolia |
Packera macounii |
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cleftleaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel |
long-rayed groundsel, Puget butterweed, Siskiyou Mountains ragwort |
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Habit | Plants perennial, 20–50+ cm; caudices weak or stout, horizontal or suberect and fibrous-rooted. | Plants perennial, 30–40+ cm; taprooted, caudices ± branching, becoming rhizomatous. |
Stems | 1 or 2–5, clustered, glabrous or sometimes sparsely pubescent near base and in leaf axils. |
1, sparsely to densely tomentose or glabrate. |
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. |
blades narrowly lanceolate to oblanceolate, bases tapering; margins entire or shallowly toothed, slightly revolute, petiolate. |
Cauline leaves | similar to basal, gradually reduced, petiolate or sessile. |
gradually reduced; upper bract-like; lower petiolate; upper sessile. |
Involucres | campanulate. |
cylindric to narrowly campanulate. |
Ray florets | 8 or 13; rays 5–10 mm. |
8(13); rays 8–10+ mm. |
Disc florets | 35–60; corolla tubes 2–4 mm; limbs 2.5–4 mm. |
30–40+; corolla tubes 2.5–3.5 mm; limbs 2–3 mm. |
Phyllaries | (8)13 or 21, 4–7+ mm, green; tips sometimes anthocyanic; surfaces glabrous. |
13 or 21, 5–7+ mm, green; surfaces glabrous. |
Calyculi | conspicuous. |
0 or inconspicuous. |
Fruits | 1–2.5 mm, glabrous; pappi 3–6 mm. |
3–4.5 mm, glabrous; pappi 4–5 mm. |
Heads | 2–20+; in corymb- or subumbel-like arrays; peduncles glabrous or sparsely tomentose, bracteate. |
6–15+; in corymb-like arrays; peduncles sparsely tomentose to glabrate; bracts absent or inconspicuous. |
2n | =46, 92. |
=46, 92. |
Packera streptanthifolia |
Packera macounii |
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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. |
Streams, roadsides, clearings, disturbed areas, coniferous woodlands in rocky soils, serpentine. Flowering Apr–Jul. 50–1400 m. Casc, CR, Est, Lava, Sisk, WV. CA, WA; north to British Columbia. Native. Packera macounii is similar in overall morphology to P. cana. However, its leaves are narrower and commonly revolute. Although it is often cited as being collected on serpentine soils, it is not restricted to them. |
Source | Flora of Oregon, volume 2, page 324 Debra Trock |
Flora of Oregon, volume 2, page 323 Debra Trock |
Sibling taxa | ||
Synonyms | Packera streptanthifolia var. streptanthifolia, Senecio cymbalarioides, Senecio leonardii, Senecio streptanthifolius | Senecio fastigiatus, Senecio macounii |
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