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

Annual broadleaf weed identification

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

Descriptions of annual broadleaf weed seedlings

Buckwheat, wild

buckwheat

Buckwheat, wild

Leaves heart-shaped, entire (smooth) margins, alternate, bearing ochrea at base of petiole; flowers small, greenish; seed triangular; plants viny and wining.

 

 

Buffalobur

Buffalobur

Buffalobur

Leaves deeply lobed, alternate, petioles and stem prickly with yellow spines; flowers yellow; fruit a berry-like capsule beset with long yellow spines; plant erect or trailing.

 

 

Cocklebur, common

cocklebur

Cocklebur, common

Leaves alternate, coarsely toothed or lobed, rough; flowers greenish; fruit a spiny bur containing two seeds; plant erect.

 

 

Kochia

kochia

Kochia

Leaves small, linear, densely hairy; flowers small, greenish; fruit small, one-seeded; stem often turning reddish in fall; plant erect, bushy.

 

 

 

Lambsquarters, common

lambsquarters

Lambsquarters, common

Leaves alternate, white mealy, toothed; flowers gray-green in small round clusters; fruits small, one-seeded; plant erect, much branched.

 

 

 

Marshelder

marshelder

Marshelder

Leaves opposite, long petiole, coarsely toothed or lobed; flowers small, greenish-yellow, in clusters; fruits one-seeded; plants erect.

 

 

Mustard, wild

mustard

Mustard, wild

Leaves alternate, rough hairy, toothed or lobed; flowers yellow, with 4 petals; fruit a many-seeded cylindrical capsule; plants erect or trailing.

 

 

Nightshade, black

nightshade

Nightshade, black

Leaves alternate, coarsely toothed; flowers white to lavender with yellow centers; fruit a greenish berry turning black at maturity; plants erect or trailing.

 

 

Pigweed

pigweed

Pigweed

Leaves alternate, long petiole, leaf margins slightly toothed; flowers small, greenish, subtended by bristles; seeds black, shiny; plant erect; tap root often reddish.

 

 

 

Ragweed, common

ragweed

Ragweed, common

Leaves deeply lobed, fern-like, alternate, leaves and stems densely white, hairy; flowers small yellowish-green, separate male and female flowers on same plant; seeds small, crown-shaped.

 

 

 

Ragweed, giant

ragweed-giant

Ragweed, giant

Leaves deeply three-to-five lobed, opposite except at top of plant; flowers small, greenish-yellow, separate male and female flowers on same plant; seed 1/4 inch or more across, crown-shaped.

 

 

 

Smartweed, Pennsylvania

smartweed

Smartweed, Pennsylvania

Leaves alternate, smooth, entire (smooth) margins, ochrea at base of leaf petiole; stem nodes swollen; flowers in pink raceme-like clusters; seed shiny, lens-shaped; plants erect or trailing.

 

 

 

Sunflower, wild

sunflower

Sunflower, wild

Leaves alternate, long petiole, coarsely toothed, rough hairy; flowers yellow in large heads with dark center; seeds large, oblong, many per head; plants erect, tall.

 

 

 

Thistle, Russian

thistle

Thistle, Russian

Leaves narrow, thread-like, spine tipped, alternate; flowers small, grayish-green; seed coiled; stem often streaked with red.

 

 

 

Velvetleaf

velvetleaf

Velvetleaf

Leaves alternate, large, heart-shaped, velvety soft hairy, stem pubescent, plant has strong odor; flowers yellow; fruit a button-like capsule with numerous heart-shaped seeds; plant erect, much branched.

 

 

 

In cooperation with NCR Educational Materials Project.

Issued in furtherance of Cooperative Extension work, Acts of Congress of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture and Cooperative Extension Services of Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin, Charles H. Casey, Interim Dean and Director, University of Minnesota Extension Service, St. Paul, Minnesota 55108.

Sponsored by the Extension services of Illinois, Iowa, Kansas, Michigan, Minnesota, Nebraska, North Dakota, and Ohio, in cooperation with SEA-Extension, USDA.


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