Sonchus oleraceus

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head--this head consists entirely of ligulate (similar to ray) flowers.  No disk flowers are present.  Thus this head is an example of a ligulate head. head again--do you see the old head to the right, beginning to produce fruits?
leaf--notice the bristles along the leaf margin.  Is this a simple or compound leaf? leaf base--this is a good example of a clasping leaf base.  Do you see how the leaf base tapers to a pont?  This is a good character to differentiate Sonchus oleraceus from its close relative S. asper, which has a rounded leaf base.

latex--Sonchus belongs to a group of Asteraceae that share a number of characterisics, including ligulate heads and milky sap (latex).  Dandelions, lettuce, and chicory also belong to this group.