Wiktionary
bulbous buttercup
n. A perennial weed, (taxlink Ranunculus bulbosus species noshow=1), that has attractive yellow flowers
Usage examples of "bulbous buttercup".
The Bulbous Buttercup has some superficial resemblance to the Upright Crowfoot and the Creeping Crowfoot, but is distinguished not only by its bulb and by the fact that it never throws out runners, but by the fact that its sepals are turned back in the fully expanded blossom, so as to touch the stemthat supports the flower.