I live in Pittsburgh, PA and I'm looking to replace a steep stretch of grass
that is difficult to mow with a low, 1" to 2", annual ground cover with yellow
flowers. I'd like the flowers to stick around spring to early fall. Is there
such a beast?

Potentilla neumanniana
http://www.colostate.edu/Depts/CoopE...s/creeping.htm
sed5555