The staminate (male) flower heads are clustered at the tips of short flower spikes, and the pistillate (female) flower heads are clustered below them. The flowers are wind-pollinated and are followed by spiny burs. The leaves have toothed margins and are hairy, petiolate, mostly alternate, gray-green in color, triangular in shape, and up to 1 3/4 inches (4.4 cm) long. The stems are upright, hairy, and brownish to green in color. Also called Triangle Bur Ragweed.

Santa Catalina Mountains
Sabino Canyon Recreation Area
Location: By trail to Bear Canyon near Visitor Center.
2/21/17, 2/28/17

See SEINet Pictures and Description

See FireFly Forest Pictures and Description