Helianthus
sunflower
8 species
2 subspecies and varieties
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Helianthus annuuscommon sunflower
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.
Origin: Native and introduced populations in Washington
Flowers: June-September
Helianthus ciliaris
Origin: Introduced
Helianthus cusickiiCusick's sunflower, turniproot sunflower
Distribution: In Washington, from Chelan County south between the Cascades and the Columbia River, eastern Oregon and adjacent Idaho, and northeastern California.
Habitat: Dry, open plains and foothills.
Origin: Native
Flowers: April - August
Helianthus grosseserratussawtooth sunflower
Origin: Introduced from eastern North America along railroads at Bingen and near Spokane
Helianthus maximilianinarrow leaved sunflower
Distribution: Introduced from east of the Rockies to British Columbia, Idaho, and eastern Washington.
Habitat: Dry, open places, often on waste ground.
Origin: Introduced
Flowers: July-September
Helianthus nuttalliiNuttall's sunflower
Distribution: Chiefly east of the Cascades: Western and Mid-western United States and adjacent Canada
Habitat: Meadows and other moist places, low to moderate elevations in the mountains
Origin: Native
Flowers: July - September
ssp. nuttallii – cordilleran sunflower, Nuttall's sunflower
Helianthus petiolarisprairie sunflower
Origin: Introduced from further east
Flowers: June - September
Helianthus tuberosusJerusalem artichoke
Distribution: Introdued and widespread in eastern United States; uncommon in the Pacific Northwest.
Habitat: Moist soil and waste places.
Origin: Introduced
Flowers: August - October