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The Virtual WeedPatch
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seedlingID.html

Weed Identification: Seedlings

Weed seedling identification is both the most important time to ID weeds to aid management decisions, as well as the most difficult time in a weed's life cycle to make that ID: they are small and few features are apparent.

One good way to learn weed seedlings is by the order in which they emerge in crop fields in the spring.

Proceed through each of the weed species below:


Composite (Compositae) Family


dandelion (Taraxacum officinale) Perennial
common cocklebur (Xanthium strumarium) Summer annual

Ragweed species-group:
-common ragweed (Ambrosia artimeisiifolia) Summer annual
-giant ragweed (Ambrosia trif

Thistle species-group:
-Canada thistle (Circium arvense) Perennial
-biennial thistles:
--musk thistle
--bull thistle (Circium vulgare) biennial


Dogbane ( ) Family


hemp dogbane

Grass (Graminaceae; Poaceae) Family


quackgrass (Elytrigia repens ) Perennial
barnyardgrass

Foxtail species-group:
-bristly foxtail (Setaria verticillata) summer annual
-green foxtail (Setaria viridis) summer annual
-giant foxtail (Setaria faberi) summer annual
-knotroot foxtail (Setaria geniculata) summer annual
-yellow foxtail (Setaria glauca) summer annual

Panicum species-group:
-wild proso millet (Panicum mileaceum) summer annual
-fall panicum
-witchgrass

Crabgrass species-group:
-large crabgrass (Digitaria sanguinalis) summer annual
-smooth crabgrass (Digitaria ischaemum) summer annual

Sorghum species-group:
-johnsongrass
-sorghum-almum
-shattercane

woolly cupgrass (Eriochloa villosa) summer annual


Lambsquarters (Chenopodiaceae) Family


common lambsquarters (Chenopodium album) Summer annual


Mallow (Malvaceae) Family


velvetleaf (Abutilon theophrasti) Summer annual

The Milkweed (Asclepiadaceae) Family


common milkweed


Mustard (Cruciferea) Family


field pennycress (Thlaspi arvense) Winter annual
shepard's purse (Capsella bursa-pastoris) Annual/Winter annual
wild mustard (Sinapis arvensis) annual/winter annual


Nightshade ( ) Family


jimsonweed


Pigweed (Amaranthaceae) Family


The pigweed species-group


Smartweed (Polygoneaceae) Family


Knotweed species-group:
-prostrate knotweed (Polygonum aviculare) Summer annual
-erect knotweed (Polygonum erectum) summer annual

Smartweed species-group:
-Pennsylvania smartweed (Polygonum Pensylvanicum) summer annual
-Ladysthumb (Polygonum persicaria) summer annual




©jdekker-1997