Blooms: June-September
Habit: herb
Duration: annual
Origin: Native and introduced populations
Distribution: Occurring chiefly east of the Cascades in Washington, but also on west side where escaped from cultivation.
Habitat: Open, dry to moderately moist soil; foothills, valleys and waste land.
Habit: herb
Duration: annual
Origin: Native and introduced populations
Distribution: Occurring chiefly east of the Cascades in Washington, but also on west side where escaped from cultivation.
Habitat: Open, dry to moderately moist soil; foothills, valleys and waste land.
Species Description:
General: Coarse annual, 4-20 dm. tall, the herbage rough-hairy.
Leaves: Leaves chiefly alternate, long-petiolate, mostly toothed, ovate or broader, the lower often cordate.
Flowers: Heads large, reddish-brown disk over 2 cm. wide; involucral bracts ovate, sub-equal, green, tapered to a point, covered with short, stiff hairs, with longer hairs on the margins; ray flowers large, yellow and neutral; receptacle chaffy throughout; pappus of 2 readily deciduous awns.
Fruits: Achenes clasped by the inner involucral bracts.
General: Coarse annual, 4-20 dm. tall, the herbage rough-hairy.
Leaves: Leaves chiefly alternate, long-petiolate, mostly toothed, ovate or broader, the lower often cordate.
Flowers: Heads large, reddish-brown disk over 2 cm. wide; involucral bracts ovate, sub-equal, green, tapered to a point, covered with short, stiff hairs, with longer hairs on the margins; ray flowers large, yellow and neutral; receptacle chaffy throughout; pappus of 2 readily deciduous awns.
Fruits: Achenes clasped by the inner involucral bracts.
Accepted Name:
Helianthus annuus L.Synonyms:
Helianthus annuus L. ssp. lenticularis (Dougl. ex Lindl.) Cockerell
Treated in Flora of the PNW as:
Helianthus annuus
Additional Resources:
PNW Herbaria Specimens: View list of Helianthus annuus specimens in the Consortium of Pacific Northwest Herbaria database.
WTU Herbarium Specimens: View list of Helianthus annuus specimens in the WTU Herbarium database.
Washington Flora Checklist: Helianthus annuus treatment.
E-Flora BC: Helianthus annuus atlas page.
CalPhotos: Helianthus annuus images.
USDA Plants Database: Helianthus annuus.
Dana Visalli
Richard Old
Richard Old
Richard Old
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2007
G. D. Carr, 2010
G. D. Carr, 2010
G. D. Carr, 2010
Ron Bockelman, 2010
Ron Bockelman, 2010
Ron Bockelman, 2010
Ron Bockelman, 2010
Ron Bockelman, 2010
Ron Bockelman, 2010
Ron Bockelman, 2010
Ron Bockelman, 2010
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 WA Native Plant Society |
