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DESCRIPTION:
Puncturevine is a warm season, mat-forming annual broadleaf weed
with an extensive root system. Leaves are finely divided into four to eight pairs
of leaflets, and stems and leaves are covered with hairs.
The mature plant grows prostrate on open ground but almost erect in dense vegetation. The yellow flowers are borne singly
in the junctions between the leaf base and stem and open only on sunny mornings, except in shady areas. The fruit consists
of a cluster of five spiny nutlets or burs; it breaks apart at maturity. The seedling has thick, elongate and brittle
cotyledons (seed leaves), which are green above, grayish underneath and creased along the prominent midvein. The true
leaves consist of 8 to 16 leaflets.
See UC IPM's Puncturevine Pest
Note for more information.
Broadleaf ID illustration.
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