Up to 10 ft. tall, green with purple spots, stout, hollow except at nodes and highly branched with lengthwise ridges
Triangular, 4-12 in. long, finely pinnate-divided (fern-like) and lack hair (glabrous); leaflets have toothed edges; foliage has a musty odor
Small and white; arranged in umbrella-like clusters at end of a stalk
Thick, deep taproot
Grows best in moist sites; often infests crop fields, waterways, roadsides and waste areas; known to occur in all Nevada counties EXCEPT Clark, Lander, Mineral, Nye and Pershing
Biennial; reproduces by seed
Highly toxic to animals and humans when consumed
Repeated mowing or tillage prior to seed production is effective; hand-removal by cutting the taproot below the crown can also eliminate plants (avoid contact with skin)
An insect biological control agent is available
Apply 2,4-D, MCPA, glyphosate, chlorsulfuron or metsulfuron to young actively growing plants