Hunting for the scourge of cyclists... puncturevine!
I've written previously about puncturevine (aka goathead), Tribulus terrestris . Those "caltrop" shaped seeds are the bane of bare feet, dog paws, and bicycle tires. Pulling a single puncturevine plant off a sidewalk in Denver. Puncturevine leaves and flowers. The University of California IPM program describes the plant as follows: Mature plant Plants grow prostrate over open ground, but when shaded or competing with other plants they can grow nearly erect. Stems occasionally grow over 3 feet (1 m) long, have many branches, are green to reddish brown, and spread radially from the crown. Stems and leaves are covered with hairs. Leaves are mostly 2/17 to 1/5 of an inch (3–5 cm) long, finely divided into three to seven pairs of leaflets, and opposite to one another along the stem. Flowers Flowering takes place from March through October. Flowers are bright yellow, about 1/5 to 3/5 of an inch (5–15 mm) in diameter, and are produced singly where the stem and leaf stalk