Buttercups! Are there any more shiny petals in nature? Sometimes called crowfoot, the genus Ranunculus has about 300 species worldwide. According to Flora of North America, we have 77, eleven of which are introduced. Corn buttercups are among the introduced species, often occurring in cultivated or weedy areas. The habit of popping up in our fields led to many creative names in its native Britain, including devil-on-both-sides, hellweed, devil's currycombs, crowclaws, horse-gold, eggs-and-bacon, and jackweed. Here corn buttercups have been recorded in AL, AR, CA, GA, ID, IL, KS, LA, MD, MO, MS, MT, NC, NJ, NY, OH, OR, PA, SC, TN, UT, WA, and WV. Polk Co TN, 7/6/18. Buttercup family, Ranunculaceae.