Centaurea solstitialis |
Centaurea sulphurea |
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yellow star-thistle |
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Habit | Annual or biennial, 2-8 dm. tall, thinly white-woolly throughout, the stem winged. | |
Leaves | Basal leaves lyrate and pinnatifid, up to 20 cm. long and 5 cm. wide; cauline leaves smaller, becoming linear and entire upward. |
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Flowers | Heads several, broader toward the base; involucre 10-15 mm. high, its middle and outer bracts spine-tipped, the larger spines 11-22 mm. long; flowers yellow; pappus of the outer flowers wanting, that of the others 3-5 mm. long; receptacle densely bristly. |
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Centaurea solstitialis |
Centaurea sulphurea |
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Flowering time | July-September | |
Habitat | Roadsides, fields, ditches, meadows, grassy slopes, wastelots, and other disturbed, open areas at low to middle elevations. | |
Distribution | Occurring chiefly east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across most of North America to the Atlantic Coast.
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Origin | Introduced from Europe | |
Conservation status | Not of concern | |
Sibling taxa | ||
Web links |
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