Creeping Buttercup
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Ranunculus repens
Common & widespread in Britain.
The flowers are golden yellow, glossy, and 2–3 cm (3⁄4–1+1⁄4 in) diameter, usually with five petals, and the flower stem is finely grooved.
The gloss is caused by the smooth upper surface of the petal that acts like a mirror; the gloss aids in attracting pollinating insects and thermoregulation of the flower's reproductive organs.
Flowers from May-August.