Sonchus oleraceus L. Flowers pale yellow; achenes reddish brown, linear, oblanceolate, 3 mm. long, flattened extremities blunt, 5 uneven wrinkled ridges on each side.
Beal, W. J. (William James), Seeds of Michigan Weeds—Bulletin 26...(2010)
n annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads
Syn|Hyper
milkweed
milk thistle, sow thistle
any of several Old World coarse prickly-leaved shrubs and subshrubs having milky juice and yellow flowers; widely naturalized; often noxious weeds in cultivated soil