Spiny Sowthistle:  Asteraceae  (Aster Family) Sonchus  aspers
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Photo Details
1. flower, 2. leaves, seed and stem - October 8, 2005 - Draper City, Salt Lake County, Utah - ©Nicky Davis

This noxious, non-native, European weed containing milky juice grows 1 to 5 feet tall. Prickly margined, lobed and toothed  leaves.  Upper leaves clasping. 
Yellow flower heads are about 1 inch across and are in a flat cluster of strap-shaped petals.  Seeds are in a cluster with white hairs on the ends.

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