Unlike its more popular lace leaf variety, my coreopsis has darker green leaves with bright yellow blooms that look a bit like a daisy.  Early spring blooms shoot up on long stems.  It is very drought tolerant.  I like the bright contrast of the yellow on the dark green leaves.  It is in the aster family (with the daisy, Black-Eyed Susan, and yarrow).  It grows in clumps and it is not hard to separate and propagate.

I have only grown "Mouse-Eared" coreopsis in my gardens, but I am trying to expand my collection that I offer for sale: