Lepidium lasiocarpum
This small mustard is common and often very abundant, but easily overlooked.
Plant habit in the Tucson Mts., 2/4/05.
A flower in the Tucson Mts., 2/4/05.
An immature fruit in the Tucson Mts., 2/4/05.
Plant habit at Organ Pipe Cactus National Monument, 2/5/05.