Summary ²

Lactuca serriola, also called prickly lettuce,milk thistle (not to be confused with Silybum marianum, also called milk thistle) compass plant, and scarole, is an annual or biennial plant, slightly foetid, that is commonly considered a weed of orchards, roadsides and field crops. The closest wild relative of cultivated lettuce (Lactuca sativa L.). The leaves grow along a spiny stem and get progressively smaller as they reach its top. They emit latex when cut. Many flowers are...

Sources and Credits

1. (c) George F Mayfield, some rights reserved (CC BY-SA), http://www.flickr.com/photos/33397993@N05/3364663363
2. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Lactuca_serriola

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