Ultraviolet photo of a flowering Ranunculus bulbosus (Bulbous buttercup) plant growing in grass along an abandoned railway line. In ultraviolet the undersides of the flower petals appear much darker than the top sides. The centre of the flower appears much darker than it does in visible light.
Ranunculus bulbosus is so named because it has a corm that helps the plant survive over winter. Without digging the plant up to see the corm, it is still identifiable by the way the sepals behind the flower fold back on themselves.
The plant blooms from April to May, bearing yellow flowers around 1.5 - 3 cm wide.
RAW converted in ACR
Channel mixer and hue adjustment in PS CC to modify colour