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Summer Annual Weed Seedlings

On this page
  • Spotted spurge
  • Redroot pigweed
  • Prostrate pigweed
  • Tumble pigweed
  • California burclover
  • Barnyardgrass
  • Common knotweed
  • Common purslane
  • Horseweed
  • Hairy fleabane
  • Morningglories
  • Crabgrasses

Names link to more information on identification and biology.

Click on photos to enlarge
				spurge seedling.
Spotted spurge
(Chamaesyce maculata): Spurge family; summer annual; seed leaves oval, tips roundish, blue green with smooth margin; first true leaves rounded, leaf surface smooth and dull, dark green with reddish tinge.
				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.
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.
				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.
Seedling of California burclover
California burclover
(Medicago polymorpha) Pea family; summer annual; seed leaves oblong; first true leaf rounded with single leaflet; later leaves with characteristic clover-like shape.
Seedling of barnyardgrass, 
				Echinochloa crus-galli.
(Echinochloa crus-galli) Grass family; summer annual; first leaf dull gray green; stem flattened, purplish; no ligule.

Seedling of California burclover
Common knotweed
(Polygonum arenastrum): Knotweed family; summer annual; seed leaves are long, very narrow, rounded at the tip and light green with a white cast; true leaves are much broader, emerging from an encircling, membranous sheath at the leaf base.

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.
Seedling of 
				horseweed, Conyza canadensis, at the four-leaf stage.
(Conyza canadensis): Sunflower family; summer annual; seed leaves dull green, oval with fine hairs, and with short stalks that sometimes may be tinged brown purple; first true leaves covered with hairs on upper surface and margins; undersides of early leaves smooth.
Seedling of 
				hairy fleabane, Conyza bonariensis, at the four-leaf stage.
Hairy fleabane
(Conyza bonariensis): Sunflower family; summer annual; seed leaves gray green; first leaves narrow and covered with short, soft hairs; often wrinkled or distorted.
Seedling of 
				annual morningglory, Ipomoea sp.
(Ipomoea spp.): Morningglory family; summer annual; seed leaves deeply notched; heart-shaped first true leaves with deep lobes at base; stem below seed leaves maroon at base and green toward leaf tip.
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.

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