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arrowleaf groundsel, arrowleaf ragwort

Habit Several-stemmed, glabrous, fibrous-rooted perennial 3-15 dm. tall.
Leaves

Numerous, not tufted at the base nor strongly reduced upward, the lower triangular to triangular-cordate, long-petiolate, the upper with shorter petioles and narrower blades;

leaf blades 4-20 cm. long and 2-10 cm. wide, usually strongly toothed.

Flowers

Heads several in a short, flat-topped inflorescence;

involucre 7-10 mm high, the principle bracts usually 13 but occasionally about 8. rays mostly 8, sometimes fewer, 7-13 mm. long, yellow.

Senecio triangularis

Identification notes The large, numerous, toothed, triangular leaves on a tall, lush plant growing in a wet area in the mountains will usually identify this species.
Flowering time June-September
Habitat Moist places and streambanks from the lowlands to the subalpine.
Distribution
Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
S. elmeri, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. lugens, S. neowebsteri, S. serra, S. sylvaticus, S. viscosus, S. vulgaris
Subordinate taxa
S. triangularis var. triangularis
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