"Oval" images

Polygonum persicaria

Polygonum persicaria

Photo credit

Steve Dewey, Utah State University

Polygonum persicaria

Polygonum persicaria

Photo credit

Steve Manning, Invasive Plant Control

Polygonum persicaria

Polygonum persicaria

Photo credit

Joseph M. DiTomaso, University of California - Davis

Polygonum persicaria - seed

Polygonum persicaria - seed

Photo credit

Olivia McCandless

Ladysthumb

Vincetoxicum rossicum - seedpods

Vincetoxicum rossicum - seedpods

Vincetoxicum rossicum - whole plant

Vincetoxicum rossicum - whole plant

Pale swallow-wort

Asclepias syriaca - inflorescence

Asclepias syriaca - inflorescence

Photo credit

Grant Thompson

Asclepias syriaca - leaf

Asclepias syriaca - leaf

Photo credit

Grant Thompson

Asclepias syriaca - seed

Asclepias syriaca - seed

Photo credit

Olivia McCandless

Asclepias syriaca - seed pod

Asclepias syriaca - seed pod

Asclepias syriaca - stem

Asclepias syriaca - stem

Asclepias syriaca - whole plant with seedpods

Asclepias syriaca - whole plant with seedpods

Asclepias syrica - whole plant

Asclepias syrica - whole plant

Photo credit

Grant Thompson

Common milkweed

Ambrosia trifida

Photo credit

Chris Ecans, Illinois Wildlife Action Plan

Ambrosia trifida

Photo credit

Theodore Wbster, USDA ARS

Ambrosia trifida - seed

Ambrosia trifida - seed

Photo credit

Olivia McCandless

Giant ragweed

Arctium minus - flower

Arctium minus - flower

Arctium minus - leaf

Arctium minus - leaf

Arctium minus - whole plant

Arctium minus - whole plant

Arctium minus - stem

Arctium minus - stem

Arctium minus - whole plant

Arctium minus - whole plant

Common burdock

Hypochaeris radicata

Hypochaeris radicata

Photo credit

Ohio State Weed Lab Archive

Hypochaeris radicata

Hypochaeris radicata

Photo credit

Ohio State Weed Lab Archive

Hypochaeris radicata

Hypochaeris radicata

Photo credit

Becca MacDonald, Sault College

Common cat's ear

Euphoriba humistrata

Euphoriba humistrata

Photo credit

Utah State University Archive

Euphoriba humistrata

Euphoriba humistrata

Photo credit

Bruce Ackley, Ohio State University

Euphoriba humistrata

Euphoriba humistrata

Photo credit

Bruce Ackley, Ohio State University

Prostrate spurge

Ligustrum obtusifolium

Ligustrum obtusifolium

Photo credit

Leslie J. Mehrhoff, University of Connecticut

Ligustrum obtusifolium

Ligustrum obtusifolium

Photo credit

Leslie J. Hehrhoff, University of Connecticut

Border privet

Polygonum aviculare - invading sidewalk edge

Polygonum aviculare - invading sidewalk edge

Polygonum aviculare - leaf, stem

Polygonum aviculare - leaf, stem

Polygonum aviculare - whole plant

Polygonum aviculare - whole plant

Prostrate knotweed

Apocynum cannabinum

Photo credit

James H. Miller, USDA Forest Service

Apocynum cannabinum

Photo credit

Chris Evans, Illinois Wildlife Action Plan

Apocynum cannabinum

Photo credit

Theodore Webster, USDA ARS

Hemp dogbane

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