American speedwell. Photo by: Mary Ellen (Mel) Harte, , Bugwood.org
Henbit deadnettle. Photo by: Steve Dewey, Utah State University, Bugwood.org
Hairy bittercress. Photo by: Dan Tenaglia, Missouriplants.com, Bugwood.org
Henbit deadnettle seedling. Photo by: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Downy brome (Cheatgrass). Photo by: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
European field pansy (field violet). Photo by: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Purple deadnettle. Photo by: Richard Old, XID Services, Inc., Bugwood.org
Canadian horseweed. Photo by: Richard Old, XID Services, Inc., Bugwood.org
Field violet (European field pansy). Photo by: Richard Old, XID Services, Inc., Bugwood.org
Common Chickweed. Photo by: Richard Old, XID Services, Inc., Bugwood.org
Annual rygrass. Image found at http://www.agry.purdue.edu/turf/tips/2005/cale49.htm and was by Cale Bidgelow.
Tag Archives: marestail
Weed Hotline Issue 20
Marestail (horseweed) in Flower
Marestail and Ragweed in Former Farmland Site
Former Farmland Field Growing Up in Marestail Prior to Being Developed
Canada Thistle, Common in Former Farmland Sites
Canada Thistle Showing Fluffy Seeds
Canada Thistle Patch 
Bull Thistle, Not to be Confused with Canada ThistleAll Photos by Gordon Johnson
Extension Agriculture and Commercial Horticulture Agent, University of Delaware, Kent County