Helianthus annuus |
Helianthus atrorubens |
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common sunflower |
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Habit | 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. |
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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. |
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Fruits | Achenes clasped by the inner involucral bracts. |
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Helianthus annuus |
Helianthus atrorubens |
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Flowering time | June-September | |
Habitat | Fields, roadsides, wastelots, and other open areas, often where disturbed, at low to middle elevations. | |
Distribution | Occurring chiefly east of the Cascades in Washington; British Columbia to California, east across North America to the Atlantic Coast.
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Origin | Native and introduced populations in Washington | |
Conservation status | Not of concern | |
Sibling taxa | ||
Web links |
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