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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.
In bloom. The cursed buttercup (Ranunculus sceleratus L.) is similar to the small-flowered buttercup but has divided basal leaves. Its stems are hollow. The hooked buttercup (Ranunculus recurvatus Poir.), so-named because of its hook-tipped seeds, has long yellow petals that form a flower 1 inch wide.The swamp buttercup (R. septentrionalis Poir.) has 3-lobed leaves and bright-yellow flowers 1 inch or more wide.n bloom. The cursed buttercup (Ranunculus sceleratus L.) is similar to the small-flowered buttercup but has divided basal leaves. Its stems are hollow. The hooked buttercup (Ranunculus recurvatus Poir.), so-named because of its hook-tipped seeds, has long yellow petals that form a flower 1 inch wide.