Yes, that's the name of this plant - Ranunculus ficaria - 'Brazen Hussey'. Leaves are a chocolate-brown and flowers bright buttercup yellow. I have planted it under my maple, Bloodgood and also amongst the purpled leafed oxalis (yikes...a weed! No - not this variety). Brazen Hussey has multiplied very nicely, so much so, that I have given plants away to friends and family. It is summer dormant - then magically reappears in late winter, just in time for some colour in the garden. I just love this plant!! Yes, that's a weed on the RHS - will go now and promptly yank it out!!!