Page authors: Don Knoke, David Giblin
Madia exigua
threadstem madia, little tarplant, little tarweed

Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; British Columbia to California, east to Montana, Idaho, and Nevada.

Habitat: Dry, open woods, grasslands, roadsides, and other open areas where often disturbed, from the plains and foothills, occasionally up to middle elevations in the mountains.

Flowers: May-July

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Bumblebees, bees, beetles, moths


Slender annual, up to 3 dm. tall, branched above, the herbage glandular and covered with short, stiff hairs.


Leaves linear, entire, 1-4 cm. long and 1-2 mm. wide, the lower opposite and the middle and upper alternate.


Heads on filiform, naked peduncles, small, nearly globose; involucre 2.5-4.5 mm. high, of 4-8 hairy, strongly glandular, equal-length bracts; rays very short and inconspicuous, their achenes compressed parallel to a radius of the head; disk flower solitary, surrounded by united bracts.

Accepted Name:
Madia exigua (Sm.) A. Gray
Publication: Proc. Amer. Acad. Arts. 8: 391. 1872.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Madia exigua in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Madia exigua checklist entry

OregonFlora: Madia exigua information

E-Flora BC: Madia exigua atlas page

CalPhotos: Madia exigua photos

40 photographs:
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