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lambstongue ragwort, western groundsel

mountain meadow butterweed, thick-leaved groundsel

Habit Herbs perennial or biennial, (1)2–7 dm; caudices button-like, with fleshy, fibrous, unbranched roots. Herbs perennial, (1.5)2–5(7) dm; caudices ± woody, branching, rhizomatous.
Stems

1, loosely arachnoid-tomentose, or villous, glabrate with age.

1–4, glabrous.

Leaves

mostly basal;

cauline progressively reduced distally; ± petiolate;

basal and lower cauline elliptic, lanceolate, linear, oblanceolate, rounded-deltate, rarely suborbiculate, bases tapered or truncate to cordate;

margins entire or dentate;

distal becoming sessile and bract-like.

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 0 or inconspicuous.

corymb-like arrays;

bracts 2–4 mm, conspicuous.

Involucres

urn-shaped.

broadly campanulate.

Ray florets

5, rarely 0;

rays 6–15(20) mm, yellow or white to pale yellow.

8 or 13;

rays 5–12 mm.

Disc florets

35–45.

55–65; deep golden to orange-yellow.

Phyllaries

(8)13 or 21;

tips usually black, sometimes green.

(8)13 or 21, 5–9 mm, with black tips;

surfaces densely tomentose.

Calyculi

1–5+, inconspicuous, usually < 2 mm.

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

Fruits

2.5–3 mm, usually glabrous, sometimes hairy along ribs.

2–2.5 mm, glabrous.

Heads

6–15(30+).

(1)4–12.

2n

=40, 80.

=40.

Senecio integerrimus

Senecio crassulus

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Western North America. 5 varieties; 3 varieties treated in Flora.

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 339
Debra Trock
Flora of Oregon, volume 2, page 338
Debra Trock
Sibling taxa
S. aronicoides, S. crassulus, S. ertterae, S. fremontii, S. hydrophiloides, S. hydrophilus, S. jacobaea, S. serra, S. sphaerocephalus, S. sylvaticus, S. triangularis, S. viscosus, S. vulgaris
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
Subordinate taxa
S. integerrimus var. exaltatus, S. integerrimus var. major, S. integerrimus var. ochroleucus
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