Lactuca canadensis L.
Family: Asteraceae
Canada lettuce, tall lettuce, tall wild lettuce, wild lettuce
Lactuca canadensis image
Robert Bierman  
Etymology: Lactuca: name for "milk"
Plants: erect, annual/biennial, 1'-8' tall forb with milky juice; stems leafy, smooth with whitish fuzz
Leaves: varying from entire, toothed, to pinnately-divided with narrow to arrow-shaped base, edges not spiny
Flowers: head 3/8" wide with 13-22 yellow to purple rays usually longer than wide; inflorescence with many heads in long, conical, loosely-branched cluster; blooms July-Sept.
Fruits: blackish, flat dry seed with only one obvious line on each side, and with white, fluffy pappus
Habitat: moderate moisture; meadows, fields, woods
Conservation Status: Native