Xanthium
spinosum
PNW
ID
OR
WA
79 specimens from 11 herbaria:
Idaho (18)
Oregon (46)
Washington (15)
37 images from 9 herbaria:
CIC (5)
ID (3)
IDE (7)
IDS (3)
SOC (4)
UBC (1)
VALE (1)
WCW (1)
WTU (12)
