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DESCRIPTION:
Puncturevine is a warm season, mat-forming annual weed
with an extensive root system. Leaves are finely divided into 4 to 8 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 leaf axils and open only on sunny mornings, except in shady areas. The fruit consists of a cluster of 5 spiny nutlets or burrs; it breaks apart at maturity. The seedling has thick, elongate and brittle 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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