Erigeron filifolius |
Erigeron howellii |
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Peck's threadleaf fleabane |
Howell's fleabane |
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Habit | Perennial from a taproot and branched, short woody base, 1-5 dm. tall, the stem densely covered with fine, appressed hairs aligned in one direction. | Rhizomatous perennial, the stems 2-5 dm. tall, with a few woolly hairs under the heads. |
Leaves | Leaves both basal and cauline, linear or linear-filiform, 1-8 cm. long and 0.3-3 mm. wide, of uniform width. |
Leaves alternate, thin, glabrous, the lower ones with an ellipitical blade 2-8 cm. long and 1.5-4.5 cm. wide, abruptly contracted to the 2-12 cm. petiole; middle cauline leaves ovate to cordate, strongly clasping at the base; upper leaves similar but smaller. |
Flowers | Heads solitary or several; involucre 4-6 mm. high, with fine, soft hairs or small glands or both; rays 15-125, blue, pink or white, 3-13 mm. long and 1-2 mm. wide; pappus of 20-30 simple hairs. |
Heads solitary; disk 12-20 mm. wide; involucre bracts loose, equal, glandular, somewhat herbaceous; rays 30-50, white, 13-25 mm. long and 2-4 mm. wide; disk corollas yellow, 4-5 mm. long, the lobes flaring; pappus simple, of 20-30 capillary bristles. |
Fruits | Achenes asymmetrically 5-nerved. |
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Erigeron filifolius |
Erigeron howellii |
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Flowering time | May-July | April-June |
Habitat | Sagebrush plains, dry slopes, and grasslands. | Moist, rocky places in the lowlands. |
Distribution | Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Montana, Idaho, and Utah.
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Known only from Skamania County in Washington; Skamania County, WA to Clackamas and Multnomah counties in Oregon.
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Origin | Native | Native |
Conservation status | Not of concern | Threatened in Washington (WANHP) |
Sibling taxa | ||
Web links |
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