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How to Manage Pests

Identification: Weed Photo Gallery

Little bittercress

Scientific name: Cardamine oligosperma (Mustard Family: Brassicaceae)

Life stages of Lesser-seeded bittercress top picture bottom picture

Click on image to enlarge

DESCRIPTION:
Little bittercress is a winter or summer annual (and sometimes biennial) broadleaf plant, 3 to 12 inches (7.5 - 30 cm) tall with several branched, smooth stems emerging at the soil line. Cotyledons (seed leaves) are egg-shaped to nearly round with slightly indented tips. Leaves are alternate. The first 1-3 leaves are semicircular to kidney shaped with sparse coarse hairs, on stalks that are as long as or longer than blades. Mature plant leaves, divided into 5 to 11 leaflets each, radiate from the base of the stems in a rosette. Leaves are pinnately compound and leaflets are rounded, bright green, and have short stalks and several lobes. Upper stem leaflets are narrower than those near the base. Two to ten white flowers are borne from the stem on stalks of unequal length. The narrow, 0.5 to 0.75 inch (1.3 - 1.9 cm) long pods split open into two curling valves when mature, explosively projecting the flattened and finely pebbled seed up to several yards (meters) from the plant. Hairy bittercress (C. hirsuta) is similar but has fewer, lobed or kidney-shaped leaflets.

Broadleaf ID illustration.


Statewide IPM Program, Agriculture and Natural Resources, University of California
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