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Extension > Agriculture > Crops > Weed management > Annual broadleaf weed seedling identification

Annual broadleaf weed seedling identification

Gerald R. Miller, Extension Agronomist
Oliver E. Strand, former Extension Agronomist

Descriptions of annual broadleaf weed seedlings

Buckwheat, wild

buckwheat

Buckwheat, wild

Cotyledons linear; leaves alternate, heart-shaped or triangular, leaves bear ochrea at base of petiole; plant viny or twining.

 

 

 

Buffalobur

buffalobur

Buffalobur

Cotyledons linear; leaves lobed, alternate, with yellow spines developing on petiole, midrib and veins; plant erect.

 

 

Cocklebur, common

cocklebur

Cocklebur, common

Cotyledons linear; leaves alternate, toothed, prominently veined with three main veins, ovate, rough surfaced; plant erect.

 

 

Kochia

kochia

Kochia

Cotyledons very small, oval; first leaves appear opposite, later alternate, leaves densely hairy without petioles; plant erect.

 

 

Lambsquarters, common

lambsquarter

Lambsquarters, common

Cotyledons ovate, white mealy; leaves alternate, slightly toothed, white mealy; plant erect.

 

 

 

Marshelder

marshelder

Marshelder

Cotyledons oval; leaves toothed, long petiole, opposite, bristly hairy on petioles and leaf blades; plant erect.

 

 

Mustard, wild

mustard

Mustard, wild

Cotyledons heart-shaped; leaves toothed, hairy, alternate; plant erect.

 

 

Nightshade, black

nightshade

Nightshade, black

Cotyledons ovate; leaves alternate, ovate, dark green, veins prominent, petioles purplish; plant erect or trailing.

 

 

 

Pigweed

pigweed

Pigweed

Cotyledons linear; leaves alternate, ovate, indented at tip, midvein prominent, petioles purplish; plant erect.

 

 

Ragweed, common

ragweed-common

Ragweed, common

Cotyledons linear to somewhat oval, thick; leaves opposite at base of plant-alternate above-deeply lobed, rough hairy; stem densely hairy; plant erect.

 

 

 

Ragweed, giant

ragweed-giant

Ragweed, giant

Cotyledons ovate, large; leaves deeply three-lobed, opposite, rough surfaced; plant erect.

 

 

 

Smartweed, Pennsylvania

smartweed

Smartweed, Pennsylvania

Cotyledons linear; leaves alternate, smooth, petiole bears ochrea without fringe of hairs at top; plant erect or trailing.

 

 

 

Sunflower, wild

sunflower

Sunflower, wild

Cotyledons oval, rough; leaves opposite at base of plant-alternate above-rough hairy, toothed; plant erect.

 

 

Thistle, Russian

thistle

Thistle, Russian

Cotyledons linear thread-like; leaves very narrow threadlike and cylindrical, first leaves appear opposite, later become alternate, leaves later become spine-tipped; plant erect.

 

 

Velvetleaf

velvetleaf

Velvetleaf

Cotyledons heart-shaped with blunt tips; leaves alternate, heart-shaped with toothed margins, velvety soft hairy; plants erect.

 

 

 

 

 


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