This perennial spreads from roots and seed. Seed leaves are nearly square with a shallow notch at the tip.
Flowers on this perennial have two leafy bracts at the base; leaves are triangular.
This summer annual's climbing vine resembles cucumber plants in early growth stages.
A coarse, bushy summer annual, cocklebur invade pastures and other moist areas.
Small flowers appear in dense heads on this perennial, followed later by slender, pointed pods.
Its prickly stems and leaves keep livestock from feeding on this poisonous perennial.
A perennial with rough branching stems, Jerusalem artichoke is from the sunflower family.
This annual prefers to grow in warm areas and is poisonous.
The seedlings of this annual have thick, dull green leaves above and magenta ones underneath.
This summer annual produces early leaves that are dull bluish green above and often purple below.
The leaves on this perennial can become 4-10 in. long and sometimes have red veins.
The perennial's slender, twiningstems may reach to 10 ft. in length. Leaves are heart-shaped.
A summer annual, ivyleaf morningglory has three-lobed leaves and large flowers.
This annual's vines have heart-shaped leaves that taper with funnel-shaped white flowers.
An annual, prostrate pigweed tends to spread in multiple directions from a taproot system.
A summer annual, this weed has leaves with wavy margins and hairs along the veins of lower surfaces.
An annual, smooth pigweed has a pink or red taproot and green to reddish stem.
An annual or biennial weed, prickly lettuce has prickly leaves with a milky sap.
An annual, puncture vine grows on disturbed earth, weedy fields and roadsides.
The leaves on this summer annual are hairy on the upper surface and margin.
An annual, spiny sowthistle has bluish-green leaves and stems that produce a milky sap when cut.
A perennial by rhizomes, Canada thistle has hairy young leaves; leaf margins are wavy with spines.
A summer annual, velvetleaf has alternate, heart-shaped leaves that are hairy on both sides.
CORN & SOYBEAN DIGEST APPRECIATES THE USE OF PHOTOS AND INFORMATION FROM JOHN MEADE/RUTGERS COOPERATIVE EXTENSION AND THE VIRGINIA TECH WEED ID GUIDE.