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How to Grow Buttercup-Ranunculus. Buttercup flowers are members of the Ranunculus genus, a large family (about 400 species) of flowers.These bright, yellow, five-petaled summer bloomers, are native to Asia, Australia, Central America, North America and Europe.ow to Grow Buttercup-Ranunculus. Buttercup flowers are members of the Ranunculus genus, a large family (about 400 species) of flowers.
1 Yellow wood anemone (Anemone ranunculoides), also known as the Buttercup Anemone, is a similar plant with slightly smaller flowers of rich yellow colouring. 2  In medicine, Anemone is used as a treatment for cramps, menstrual problems and emotional distress. The Anemone plants are perennial herbs with an underground rootstock, and radical, more or less deeply cut leaves. 2  The elongated flower stem bears one or several, white, red, blue or rarely yellow flowers. 3  There is an involucre of three leaflets below each flower.