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common groundsel, old-man-in-the-spring

Habit Herbs annual, (1)2–5(6+) dm; caudices taprooted.
Stems

usually 1, rarely 2–3, glabrous or sparsely and unevenly tomentose.

Leaves

evenly distributed along stems, oblanceolate to narrowly obovate or ovate, bases tapering;

margins lobulate to dentate, ultimate margins secondarily denticulate;

proximal petiolate;

distal sessile.

Inflorescences

loose corymb-like arrays;

bracts few, inconspicuous.

Involucres

urceolate.

Ray florets

0.

Disc florets

(30)55–65.

Phyllaries

21, 4–6 mm;

tips usually black.

Calyculi

2–4(6+) bractlets, 2–3 mm.

Fruits

2–2.5 mm, sparsely to densely pubescent, rarely glabrous.

Heads

8–20.

2n

=40.

Senecio vulgaris

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Disturbed areas. Flowering Feb–Oct. 0–1000 m. CR, ECas, Est, Lava, Sisk, WV. CA, ID, NV, WA; throughout North America; Asia, Europe. Exotic.

Source Flora of Oregon, volume 2, page 342
Debra Trock
Sibling taxa
S. aronicoides, S. crassulus, S. ertterae, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. serra, S. sphaerocephalus, S. sylvaticus, S. triangularis, S. viscosus
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