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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.
Aside from creeping buttercup, other perennial species include R. occidentalis, the Western field buttercup, identifiable by long, three-lobed leaves extending from the base. R. acris, or Tall buttercup, reaches heights of 3 feet with 1-inch wide blooms. Birdfoot buttercup, R. orthorhynchus, grows to 24 inches and has distinctive achenes or fruit that appear straight and skinny verses hooked like most others.