bidens tripartita

NOUN
17 LETTERS · STARTS WITH B

bidens tripartita is a valid 17-letter word worth 21 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3I1D2E1N1S1T1R1I1P3A1R1T1I1T1A1
3 + 1 + 2 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does bidens tripartita mean?