Xanthium
spinosum
PNW
ID
OR
WA
81 specimens from 12 herbaria:
Idaho (18)
Oregon (47)
Washington (16)
40 images from 12 herbaria:
CIC (5)
HPSU (1)
ID (3)
IDE (7)
IDS (3)
OSC (1)
SOC (4)
UBC (1)
VALE (1)
WCW (1)
WS (1)
WTU (12)