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Summer Annual Weed Seedlings

On this page
  • Hairy fleabane
  • Horseweed
  • Pineappleweed
  • Annual sowthistle
  • Sweetclover
  • Nettleleaf goosefoot
  • Common lambsquarters
  • Russian thistle
  • Redroot pigweed
  • Common purslane
  • Puncturevine
  • Spotted spurge
  • Barnyardgrass

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

Click on photos to enlarge
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 				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.
Pineappleweed seedling
(Chamomilla suaveolens): Sunflower family; summer or winter annual; seed leaves narrowly oblong to linear, fused at base, pointed or rounded at the tip; first true leaves opposite, smooth-edged or with feather-like lobes; later leaves alternate, with feather-like lobes, forming a rosette.
Sowthistle seedling
Annual sowthistle
(Sonchus oleraceus): Sunflower family; summer or winter annual; seed leaves markedly stalked, almost spoon-shaped, rounded at tip and often have grayish powdery bloom; injured tissue bleeds milky white latex.
(Melilotus sp.): Pea family; biennial, sometimes annual or short-lived perennial; seed leaves oblong, smooth; first true leaf oval, narrow at base and squared at tip with a minute nipplelike point; subsequent leaves compound with three leaflets, each resembling the first true leaf.
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 common lambsquarters, Chenopodium album.
Common lambsquarters
(Chenopodium album): Goosefoot family; summer annual; seed leaves are narrow, with nearly parallel sides; seed leaves and early true leaves dull blue green above and often purple below; young leaves have mealy appearance from coating of fine translucent granules.
Russian thistle seedlign
Russian thistle
(Salsola tragus): Goosefoot family; summer annual; cotyledons and first true leaves long and thin; first leaves are fleshy, soft, and weakly spine-tipped; stems slender and flexible, often with reddish purple striations along their length.
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.
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.
Puncturevine seedling.
(Tribulus terrestris): Caltrop family; summer annual; seed leaves thick, brittle, 2 to 3 times longer than wide; petioles pinkish; true leaves dark green with grayish underside and rough margins.
Spotted 				spurge seedling.
Spotted spurge
(Euphorbia maculata(=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.
Seedling of barnyardgrass
(Echinochloa crus-galli) Grass family; summer annual; first leaf dull gray green; stem flattened, purplish; no ligule.

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