DEVIL'S BEGGARTICKS, Bidens
frondosa L. 1, entire plant; 2, seed; 3, flower
head. Annual, reproducing by seed. Taproot much branched
and shallow. Stems 3 to 5 feet (0.9 to 1.5 m) tall, slightly hairy
and somewhat 4-sided. Most branching occurs near the top. Leaves
opposite, 4-ranked, deeply pinnately divided, and covered with minute hairs.
Flower heads about 1 inch (2.5 cm) in diameter, surrounded
by leafy bracts. Ray flowers around the outer edge yellow, disk flowers
in the center brownish-yellow. Seed flat, brown, about 1/2 inch
(1.3 cm) long with 2 barbed spines attached at upper end. Found
frequently on rich, moist soil in low areas and waste places. Not found
in cultivated fields. Several other species similar to this one are found
in the region.