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Lettuce

Perennial Weeds—Central Valley

See also, perennial weeds of other regions: Central Coast and Desert.

Use the photos below to identify weeds in the field. Names link to more information on identification and biology.

Click on photos to enlarge
Seedling of bermudagrass
Bermudagrass
(Cynodon dactylon): Grass family; perennial; first leaves with somewhat rough surface; ligule surrounded by ring of hairs with tuft of long hairs on either side; auricles absent; stem flat, wiry, and without hairs.
Johnsongrass rhizomes.
Johnsongrass
(Sorghum halepense): Grass family; perennial; persists and spreads via underground stems (rhizomes), which are thick, fleshy, and segmented; roots and shoots can rise from each rhizome segment; leaves have a prominent whitish midvein.
No photo available.
(Seedlings rarely occur, most plants grow from rhizomes and/or tubers)
Purple nutsedge
(Cyperus rotundus ): Sedge family; perennial; (young plant) young shoot is somewhat stiff, upright, and light green with a fairly prominent whitish midvein; no auricle or ligule; triangular stem solid or pithy and rarely hollow as in grasses. Seedling 2 to 3 newly emerged leaves with smooth, membranous, linear blades folded lengthwise; sheaths tubular.
Young yellow nutsedge plant.
Yellow nutsedge
(Cyperus esculentus): Sedge family; perennial; grasslike; light green blades, flat, slender; leaf tip long and drawn out; nutlets globe shaped, smooth, and almond flavored.

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