Use the photos below to identify weeds in the field. Names link
to more information on identification and biology.
Click
on photos to enlarge
Black nightshade
(Solanum nigrum): Nightshade family; summer annual; seed leaves oval and
pointed; first true leaves spade shaped with smooth edges; lower surfaces often
purple; petioles stems and leaves with some hairs.
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Hairy nightshade
(Solanum sarrachoides): Nightshade family; summer annual; seed leaves
narrow, small, and lanced shaped with very short soft hairs along edges; first
true leaves with wavy edges and prominent veins.
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Barnyardgrass
(Echinochloa crus-galli): Grass family; summer annual; first leaf dull
gray-green; stem flattened, purplish; no ligule. |
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. |
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. |
Dodder
(Cuscuta spp.): Dodder family; summer annual; leafless or with small scalelike
triangular leaves about 1/16-inch in length; stems slender, twining or threadlike;
vary in color from pale green to yellow or bright orange. |
Little mallow (cheeseweed)
(Malva parviflora): Mallow family; winter annual; seed leaves heart shaped,
sometimes with red tinge; true leaves roundish with wavy, shallow-toothed margins. |
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. |
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. |
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. |
Velvetleaf
(Abutilon theophrasti): Mallow family; summer annual; seed leaves covered
with fine, soft hairs; seedlings with one round seed leaf, the other sometimes
slightly heart shaped; first true leaves thin and dull, light green, with prominent
veins on underside. |
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