Kohler's Medizinal-Pflanzen in naturgetreuen Abbildungen mit kurz erlauterndem Texte :.Gera-Untermhaus :Fr. Eugen Kohler,[1883-1914].biodiversitylibrary.org/page/303650
close up image of Lactuca canadensis WILD LETTUCE at the James Woodworth Prairie Preserve - a seed head with filiaments deployed for wind dispersal, side view, black seeds somewhat visible
close up image of Lactuca canadensis WILD LETTUCE at the James Woodworth Prairie Preserve - a seed head with filiaments deployed for wind dispersal, top view, black seeds somewhat visible