Names link to more information on identification and biology.
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Annual bluegrass
(Poa annua): Grass family; winter annual; leaf tip shaped
like bow of a boat; membranous ligule rounded with slightly
pointed tip; leaf blade crinkled at midsection. |
California burclover
(Medicago
polymorpha): Pea family; summer annual; seed leaves oblong; first true
leaf rounded with single leaflet; later leaves with characteristic
clover-like shape. |
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. |
Chickweed
(Stellaria media): Pink family; winter annual; seed leaves with prominent midveins, about 4 times longer than wide, tapering to point at tip; true leaves broader, opposite, and yellow-green. |
Common groundsel
(Senecio vulgaris): Sunflower family; winter annual;
seed leaves narrow, with blunt narrow tip; first true leaves
with shallow teeth; third and fourth leaves more deeply lobed. |
Filaree
(Erodium spp.): Geranium family; winter annual or biennial; cotyledons have long stalks and egg-shaped, asymmetric lobes; leaves form a rosette close to the ground. |
Henbit
(Lamium amplexicaule): Mint family; winter annual; seedling leaves small, oblong, with smooth margins; first true leaves rounded, coarsely toothed, with visible netted veins. |
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. (prevalent due
to Round-Up resistance) |
Mustards
(Brassica spp.): Mustard family; winter annual; all mustard seedlings
with broad seed leaves and deep notch at tip; first true leaves bright green
on the upper surface and paler below. |
Rabbitfoot polypogon
(Polypogon monspeliensis): Grass family; winter annual; seedling leaves are yellow-green and slender; ligules are membranous, thin, and have a pointy, ragged tip; no auricles; sheaths are open. |
Ryegrass
(Lolium spp.): Grass family; winter annual or perennial; first blade is long and narrow and stands erect; leaves are rolled in the bud, and ligule is membranous; generally, auricles are present, but may be absent on very young seedlings; blades are about 50 times longer than they are wide and have a shiny, varnished appearance. |
London rocket
(Sisymbrium irio): Mustard family; winter annual; seedlings narrow with long stalks; margins of first true leaves indented, distinguishing seedlings of London rocket from those of shepherd's purse; seedlings with deeply lobed leaves. |
Shepherd's-purse
(Capsella bursa-pastoris): Mustard family; winter annual; seed leaves
pale green with tiny granules on surface; first true leaves with smooth margins;
fourth and later leaves may be indented; true leaves covered with star-shaped
hairs. |
Sowthistles
(Sonchus spp.): Sunflower family; winter annual; seedling has stalked, spoon-shaped seed leaves, rounded at the tip; seed leaves and young leaves often have a grayish-white powdery coating, but later leaves have only a few hairs. |
Prickly lettuce
(Lactuca serriola): Sunflower family; winter annual or biennial; seed leaves about 2 times longer than wide; first true leaves with rounded margins; injured tissue bleeds milky white latex. |
Wild oats
(Avena fatua): Grass family; winter annual; first leaves with small marginal hairs and counterclockwise twist when viewed from above; ligule large, papery, and pointed. |
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