Lactuca biennis (Moench) Fernald [ Lactuca spicata var. integrifolia (Torrey & A. Gray) Britton]
no HD illustration available (m1)
Lactuca biennis (Moench) Fernald [ Sonchus biennis Moench] [Compositae]
Helen Sharp, Water-color Sketches Amer. Pl.: (1888-1910) [Helen Sharp]