What is "ranunculus bulbosus"

Cuckoobud \Cuck"oo*bud"\ (k??k"??-b?d`), n. (Bot.) A species of Ranunculus ( Ranunculus bulbosus); -- called also butterflower, buttercup, kingcup, goldcup.
--Shak.

Buttercup \But"ter*cup`\, n. (Bot.) A plant of the genus Ranunculus, or crowfoot, particularly Ranunculus bulbosus, with bright yellow flowers; -- called also butterflower, golden cup, and kingcup. It is the cuckoobud of Shakespeare.

Ranunculus bulbosus, commonly known as St. Anthony's turnip or bulbous buttercup, is a perennial member of the buttercup family. It has attractive yellow flowers, and deeply divided, three-lobed long-petioled basal leaves. Bulbous buttercup is known to form tufts.