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cleftleaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel

long-rayed groundsel, Puget butterweed, Siskiyou Mountains ragwort

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

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
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
P. bolanderi, P. cana, P. eurycephala, P. flettii, P. hesperia, P. macounii, P. porteri, P. pseudaurea, P. subnuda
P. bolanderi, P. cana, P. eurycephala, P. flettii, P. hesperia, P. porteri, P. pseudaurea, P. streptanthifolia, P. subnuda
Synonyms Packera streptanthifolia var. streptanthifolia, Senecio cymbalarioides, Senecio leonardii, Senecio streptanthifolius Senecio fastigiatus, Senecio macounii
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