antique botanical illustration "Ball Mustard"

Antique botanical illustration depicting ball mustard. 

From Farm Weeds of Canada, a book published by the Canadian Department of Agriculture in 1923. 

Described as Plate 7 / ball mustard (Neslia paniculata) / with initials N.C.

10.5" x 8"

In good vintage condition, some discolouration on bottom right of paper.