Common Tarweed, Grassy Tarplant, Grassy Tarweed, Gum-weed, Slender Tarweed
Madia gracilis
Synonyms: Madia gracilis ssp. gracilis, Madia dissitiflora
The photo above shows an above view of a flower
head of slender tarweed. Notice the smal number of disk flowers as well as the
tri-lobed ray flowers. The photos on this page were all taken at a rock quarry
at about 4100' atop the ridge dividing the Dairy Creek and Cougar Creek drainages
at the southeastern corner of Mt. Adams.........July 11, 2005. Note the 8 ray flowers which usually helpsdistinguish this species from the similar Madia sativa (typically 13 ray flowers.).
The photo above shows a good close-up view
of the ovoid or urn-shaped heads. Note the gland-tipped hairs which are primarily
found within the inflorescence or at most, on the upper portion of the plant.
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The photo at left shows the inflorrescence of slender tarweed. The photo at right shows the upper stem and stem leaf of slender tarweed.
Notice the many spreading hairs, some of which are capped with brownish glands.
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Slender tarweed as seen along Lakeside Road at the public fishing area, Conboy Lake National Wildlife Refuge..........June 20, 2013.
Paul Slichter