Gumweed or Resinweed (Grindelia spp.).
This is a secondary selenium accumulator. It is a common biennial or perennial herbaceous plant with leafy stems that grow up to 3 ft (1 m) tall. The leaves are alternate, simple, with serrated edges, and have scattered glands that produce a sticky, gum-like substance. The yellow flowers are solitary and surrounded by several rows of curved bracts that produce a white gummy-resinous material. The ray flowers, when present, are about 3/8 inch (8 to 10 mm) long and lemon-yellow to bright yellow in color. The pappus awns are about 1/8 inch (2 to 3 mm) long.
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