Ceratocephala testiculata
 Ceratocephala testiculata (syn. Ceratocephala orthoceras Ranunculus testiculatus) is a flowering plant that is native to Eurasia. Common names include bur buttercup and curveseed butterwort. It is very small usually only about an inch or two tall but potentially getting up to four inches. The flowers are small and dull yellow. The leaves are hairy and somewhat dissected. It produces a cluster of hard spiny fruits (the 'burs').