Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across southern Canada and most of the United States to the Atlantic Coast.
Habitat: Dry, open, often sandy places, at low to middle elevations, often where disturbed.
Flowers: June-September
Growth Duration: Annual
Conservation Status: Not of concern
Pollination: Bumblebees, bees, butterflies, beetles
Glabrous biennial or short-lived perennial, 1-10 dm. tall.
Leaves usually with fine to coarse, thickened teeth; the lower leaves oblanceolate, up to 15 cm. long and 3 cm. wide, the middle and upper leaves somewhat reduced and clasping the stem.
Heads several, the disk 1-2 cm. wide; rays 25-40, pistillate and fertile, yellow, 7-15 mm. long; involucre strongly resinous, imbricate, the green tips of the bracts reflexed; pappus of 2 or more deciduous awns.
Achenes truncate at the apex.
Publication: Mém. Mus. Hist. Nat. 5: 50. 1819.
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var. serrulata – curlycup gumweed, serrate resinweed
Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
PNW Herbaria: Specimen records of Grindelia squarrosa in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Grindelia squarrosa checklist entry.
OregonFlora: Grindelia squarrosa information.
E-Flora BC: Grindelia squarrosa atlas page.
CalPhotos: Grindelia squarrosa photos.
USDA Plants: Grindelia squarrosa information.
