According to a writer at Red Barn Plants:

Parochetus communis, Papilionaceae, China, 10cm ht., spreading. A strange and wonderful plant where the leaves and [blue] flowers don't seem to go together. Flowers are produced mid-summer into fall. This plant spreads and roots above ground forming a mat in semi-shade and moist to wet soils. It can tolerate a wide range of conditions from sun (in wet) to shade in average garden soils.