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mountain meadow butterweed, thick-leaved groundsel

Habit Herbs perennial, (1.5)2–5(7) dm; caudices ± woody, branching, rhizomatous.
Stems

1–4, glabrous.

Leaves

basal present at flowering;

cauline evenly distributed along stems; thick and fleshy, lanceolate to subelliptic, bases tapering;

margins dentate with callous denticles to subentire;

surfaces glabrous, sometimes with broadly winged petioles;

proximal often early deciduous; mid-cauline sometimes larger, sessile and weakly clasping;

distal smaller, sessile and clasping.

Inflorescences

corymb-like arrays;

bracts 2–4 mm, conspicuous.

Involucres

broadly campanulate.

Ray florets

8 or 13;

rays 5–12 mm.

Disc florets

55–65; deep golden to orange-yellow.

Phyllaries

(8)13 or 21, 5–9 mm, with black tips;

surfaces densely tomentose.

Calyculi

(1)3–6 linear to filiform bractlets; (1)2–6 mm, with or without black tips.

Fruits

2–2.5 mm, glabrous.

Heads

(1)4–12.

2n

=40.

Senecio crassulus

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Wet to drying hillsides and meadows, open forests. Flowering May–Aug. 800–3000 m. BR, BW, Owy. ID, NV; northeast to MT, east to SD, southeast to NM. Native.

Source Flora of Oregon, volume 2, page 338
Debra Trock
Sibling taxa
S. aronicoides, S. ertterae, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. serra, S. sphaerocephalus, S. sylvaticus, S. triangularis, S. viscosus, S. vulgaris
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