GUMWEED, Grindelia squarrosa (Pursh) Dunal, 1, top of plant; 2, root and lower stern. Biennial, reproducing by seeds. Stems erect, 1 to 3 feet (30 to 90 cm) tall, branching near top, rough, somewhat sticky. Leaves coarse, oblong, slightly cupped with heavy midrib and toothed edges, alternate, partially clasping stem. Flower heads about 1 inch (2.5 cm) in diameter, yellow ray flowers surrounding the yellow disk flowers. Bracts surrounding the head are covered with a sticky resinous substance. Seeds light gray, flattened, curved, somewhat 4-angled, with longitudinal lines. Found in dry meadows, pastures, and waste places.