C. bonariensis gets 4 to 8 ft. tall with leaves to 6 in. long by 1 inch wide. Leaves are densely pubescent.
C. canadensis get 5 to 6 ft. tall with leaves 1.5 to 4 in. long by 0.1 to 0.25 in wide. Leaves are glabrous to coarsely hirsute.
The leaves in the above photo are too large and fuzzy to be C. canadensis.
