Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
PLANTS National Database
Xanthium strumarium var. canadense
GREATER THAN (MISAPPLIED)
Vascular Flora of the Carolinas (1968)
Xanthium strumarium var. strumarium
Click or hover over the thumbnails to see larger pictures.
JK Marlow jkm150226_737b
February Pickens County SC
Phyllaries mostly hooked, the whole becoming a hard prickly perigynium (bur), per Flora of North America.
JK Marlow jkm130928_750b
September Spartanburg County SC
Leaf blade broadly ovate to roughly orbicular, base cordate or nearly so, per Wildflowers of the Eastern United States.
Gill Newberry gn10_x_cocklebur
Female flowers enclosed by the involucre, forming a bur w hooked bristles, per Wildflowers of the Eastern United States.