Kerria japonica 'Pleniflora'

Kerria is referred to as the Japanese Rose, This particular variety is a double bloomed cultivar with yellow rounded blooms (reminiscent of pom-poms.) It typically grows 8-10' and more of an upright habit. 

Flowers in the spring.  Thrives in Part shade (4-6hrs sun) or can tolerate full shade (~4hrs sun).