UW Burke Herbarium species comparison

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Madia gracilis

grassy tarplant, common tarweed, slender tarweed
Habit Tar-scented, rough-hairy annual, 1-10 dm. tall, often the whole upper part of the plant covered with conspicuous stalked glands.
Leaves

Leaves linear to linear-oblong, 2-11 cm. long and 1-10 mm. wide.
Flowers

Heads in a raceme, or multiple racemes in plants with branched stems;

involucre ovoid, 6-11 mm. high and 5-10 mm. wide, its bracts in a single series and of equal length;

rays 5-13, typically 8, 4-7 mm. long, pistillate and fertile, yellow, their achenes enclosed by the involucral bracts;

disk flowers fertile, yellow, separated from the ray flowers by a row of bracts;

pappus none.
Fruits

Achenes flattened.

Madia gracilis
Flowering time June-August
Habitat Dry, open areas from shrub-steppe to middle elevations in the mountains.
Distribution
Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Idaho, Nevada, and Utah.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
M. citriodora, M. elegans, M. exigua, M. glomerata, M. sativa
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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