In article , "Cereoid+10+"
wrote:

Its the original single flowered form of Kerria japonica.

http://home.hiwaay.net/~oliver/kerria.html

And if you ask me, far more beautiful than the double version seen almost
exclusively around here.

-paghat the ratgirl

--
"Of what are you afraid, my child?" inquired the kindly teacher.
"Oh, sir! The flowers, they are wild," replied the timid creature.
-from Peter Newell's "Wild Flowers"
See the Garden of Paghat the Ratgirl: http://www.paghat.com/