plant family

NOUN
12 LETTERS · STARTS WITH P

plant family is a valid 12-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3L1A1N1T1F4A1M3I1L1Y4
3 + 1 + 1 + 1 + 1 + 0 + 4 + 1 + 3 + 1 + 1 + 4 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does plant family mean?