What is "ranunculus ficaria"

Pilewort \Pile"wort`\, n. (Bot.) A plant ( Ranunculus Ficaria of Linn[ae]us) whose tuberous roots have been used in poultices as a specific for the piles.
--Forsyth.

Celandine \Cel"an*dine\ (s[e^]l"[a^]n*d[imac]n), n. [OE. celidoine, OF. celidoine, F. ch['e]lidoine, fr. L. chelidonia (sc. herba), fr. chelidonius pertaining to the swallow, Gr. chelido`nios, fr. chelidw`n the swallow, akin to L. hirundo a swallow.] (Bot.) A perennial herbaceous plant ( Chelidonium majus) of the poppy family, with yellow flowers. It is used as a medicine in jaundice, etc., and its acrid saffron-colored juice is used to cure warts and the itch; -- called also greater celandine and swallowwort.

Lasser celandine, the pilewort ( Ranunculus Ficaria).