Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
See more pictures at www.invasive.org.
Read Which Weed is Witchweed from Lytton Musselman and the Southern Appalachian Botanical Society.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Lamiids: Lamiales
Click or hover over the thumbnails to see larger pictures.
Julia Scher, Federal Noxious Weeds Disseminules, USDA APHIS ITP, Bugwood.org bug_5376868
Florida Division of Plant Industry Archive, Bugwood.org bug_5384180
Stems erect, rarely branched. Corolla tube apically strongly curved, per Flora of China.