bc .
Annuals.  Often fibrous-rooted.  Typical height is 1.5 to 2.5 feet.

Overall inflorescences are open, with few to many ascending to spreading branches.  Branch inflorescences are narrow and elongate.  The numerous male (staminate) flower heads are borne on very short peduncles, and are positioned in the upper half of branches. Female (pistillate) flower heads are few in number, and are positioned just below the male heads, or in leaf axils.

Flower heads are discoid, unisexual, rayless.  Plants producing both pistillate and staminate heads are commonly found. Corollas of staminate florets are whitish.  Corollas of pistillate florets are lacking. Pistillate heads usually have just one floret.

Lower leaves tend to be opposite, while upper stem leaves are often alternate.  Leaves are lance-ovate in overall outline, divided into numerous deeply-cut segments. 

Plants of fields, roadsides and disturbed areas, in sun or light shade. Flowers August to October.  Native..

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