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
(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.
(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)
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.
(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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