Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
The leaves of Spiny Cocklebur are very dark green with noticeably white midribs; that and the long spines quickly impart a distinctive look. Read more at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
Manual of the Southeastern Flora (Small, 1933)
No pictures are available at this time.