Grassy Tarweed, Grassy Tarplant, Slender Tarweed, Common Tarweed, Gum-weed
Synonyms: Madia dissitiflora, Madia gracilis ssp. gracilis
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. Except where noted, 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.
Close-up of the involucre of slender tarweed as seen along the Umatilla Rim Trail #3080 on the northwestern shoulder of High Ridge, Umatilla National Forest.........July 24, 2012.
Close-ups of the inflorescence of slender tarweed as seen along the first mile of the Lake Creek Trail #378, Strawberry Mountain Wilderness..........July 19, 2013.
Slender tarweed as seen (left and center) on lithosol soils at the junction of forest service roads 35 and 3517 on Table Mountain, Wenatchee National Forest..........June 4, 2013. The photo at right shows slender tarweed as seen in a ditch at the entrance to the Ochoco Forest Camp, Ochoco National Forest........July 13, 2017.
A close-up of the inflroescence and stem leaves of slender tarweed as seen on balds along the Steins Pillar Trail #837, Ochoco National Forest..........June 26, 2017.
Slender tarweed fading out of bloom along the Tenderfoot Trail #1819 on the north side of Big Sheep Creek about one-quarter mile west of the trailhead, Eagle Cap Wilderness.......August 12, 2018.
Close-up images of the inflorescence of slender tarweed in bloom atop Manastash Ridge at the Observatory, southwest of Ellensburg, WA.......May 27, 2019.
Flower head (sliced open) of slender tarweed as seen in scablands along Box Canyon Road, Simcoe Mountains Unit of the Klickitat Wildlife Area....July 1, 2020.
Inflorescence of slender tarweed as observed at about 6800' along the Fremont National Recreation Trail on the southwest corner of Twelvemile Peak, Fremont-Winema National Forest.......August 2, 2020.
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. Photographed on the Elowah Falls Trail in the western Columbia River Gorge.......July 14, 2006.
The upper stem and stem leaf of slender tarweed.
Notice the many spreading hairs, some of which are capped with brownish glands.
The photo above shows a stem leaf of slender tarweed as seen along the Elowah Falls Trail in the western Columbia River Gorge.........July 14, 2006.