Grindelia nana var. discoidea
Synonyms: Grindelia columbiana, Grindelia columbiana ssp. columbiana
The photo above shows Columbia rRver gumweed as seen from the Columbia Hills to the northeast of The Dalles, OR.................July 7, 2006.
Columbia river gumweed is a biennial or short-lived perennial that is fairly easy to identify. Its herbage is wholly smooth or glabrous, and the plant ranges in height from 15-80 cm. The leaves are oblanceolate in shape, with entire to serrate margins. If serrate, the margins may be blunt to sharp. The leaves are as long as 10 cm long and 1.5 cm wide.
The flower heads are discoid and fairly wide (1-2 cm in diameter). The involucre is fairly resinous with the tips of the outer bracts coiled or reflexed outward.
Columbia river gumweed is found in gravelly and sandy habitats alongside streams and rivers.
Columbia river gumweed is found from northern Idaho, and down the Columbia River through much of central Washington to Portland, OR. It is also found near Blackfoot, Idaho.
In the Columbia River Gorge, it is found between the elevations of 100'-2200' east of Lyle, WA.