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Summer Annual Weeds—Central Valley

On this page
  • California burclover
  • Large crabgrass
  • Common purslane
  • Nettleleaf goosefoot
  • Prostrate pigweed
  • Tumble pigweed
  • Redroot pigweed

See also, summer annual 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 California burclover
California burclover
(Medicago polymorpha) Pea family; winter or summer annual; seed leaves oblong; first true leaf rounded with single leaflet; later leaves with characteristic clover-like shape.
Crabgrass seedling.
Large crabgrass
(Digitaria sanguinalis): Grass family; summer annual; first leaf blade linear to lance shaped, with stiff, jagged, and papery ligule; hairs on margins of the collar wide; no auricles; leaves covered with coarse hairs; leaves rolled in bud.
Seedling of common purslane, Portulaca oleracea.
Common purslane
(Portulaca oleracea): Purslane family; summer annual; seed leaves oblong, somewhat club shaped, succulent, maroon on lower surface, and green or maroon on upper surface; young leaves smooth, succulent, oblong, green on upper surface, maroonish underneath, and broadest around leaf tip, with short petioles.
Nettleleaf goosefoot
Nettleleaf goosefoot
(Chenopodium murale): Goosefoot family; summer annual; seed leaves oblong to narrowly lance shaped, dark green; true leaves weakly toothed, leaf surfaces, especially lower surface, sparsely covered with tiny dotlike scales.
Seedling of prostrate pigweed, Amaranthus blitoides, at the two-leaf stage.
Prostrate pigweed
(Amaranthus blitoides): Pigweed family; summer annual; seed leaves narrow, pointed, 6 to 8 times longer than wide, with magenta undersides; first true leaves broader, with shiny upper surface and usually magenta-tinged undersides; edges somewhat rough.
Seedling of tumble pigweed, Amaranthus albus.
Tumble pigweed
(Amaranthus albus): Pigweed family; summer annual; seed leaves 3 to 5 times longer than wide, bright green on surface, magenta on underside; first true leaves spatulate, dark green with wavy margins, red color underneath; midrib with notched tip and bristle at end.
Redroot pigweed seedlings.
Redroot pigweed
(Amaranthus retroflexus): Pigweed family; summer annual; seed leaves long and narrow with red undersides; first true leaves with notched tips and much broader than seed leaves.
   

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