Seen in my yard in Lowell, Massachusetts, USA.
Growing along the edges of my “country” lawn! I know they are invasive, but with a camera in my hands – I don’t care!! Shown straight out of the camera – as is!
Olympus Pen E-PL2
Lens M.Zuiko Digital 40-150mm
MCON-P01 Macro Adapter
From Wikipedia – "Chelidonium majus (greater celandine; in Europe tetterwort, although in America the same name refers to bloodroot) is a herbaceous perennial plant, the only species in the genus Chelidonium. It is native to Europe and western Asia and introduced widely in North America.
While the greater celandine belongs to the poppy family, the lesser celandine belongs to the buttercup family.
The flowers consist of four yellow petals, each about 1 cm long, with two sepals. A double-flowered variety occurs naturally."