Names link to more information on identification and biology.
Click on photos to enlarge
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Barnyardgrass
(Echinochloa crus-galli) Grass family; summer annual; first
leaf dull gray-green; stem flattened, purplish; no ligule.
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Large
crabgrass
(Digitaria sanguinalis): Grass family; summer annual; first leaf
blade linear to lance shaped, with stiff, jagged, and papery ligule;
hairs on margins of the collar wide; no auricles; leaves covered with
coarse hairs; leaves rolled in bud. |
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. |
Yellow foxtail
(Setaria pumila): Grass family; summer annual; first blade linear, roughly 7
times longer than wide and opens almost parallel to ground; leaves rolled in
bud; ligule—fringe of hairs; no auricles; no hairs on leaf-sheath margin
below collar; leaf blades of young seedlings smooth on lower surface, with long
hairs on basal area of upper surface; margins smooth or slightly rough. |
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. |
Horseweed
(Conyza canadensis): Sunflower family; summer annual; seed leaves dull
green, oval with fine hairs, and with short stalks that sometimes may be tinged
with brown-purple; first true leaves covered with hairs on upper surface and
margins; undersides of early leaves smooth. |
Spotted spurge
(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. |
Puncturevine
(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. |
Purple cudweed
(Gnaphalium purpureum): Sunflower family; winter annual, summer annual,
or biennial; seed leaves and first true leaves covered on both sides with whitish
hairs; seed leaves 2 to 3 times longer than wide. |
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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.
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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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Burning nettle
(Urtica urens): Nettle family; winter or summer annual;
rounded seed leaves with smooth margin and small notch at tip; first
true leaves with small notch at tip, opposite, stalked, and distinctly
toothed.
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Tall annual willowherb
(Epibolium brachycarpum): Primrose family; summer annual;
seed leaves small, round, often dark reddish-green; true leaves narrow,
4 to 5 times longer than wide, first true leaves opposite and smooth
around edges. |
