alliaceous plant

NOUN
16 LETTERS · STARTS WITH A

alliaceous plant is a valid 16-letter word worth 19 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1L1L1I1A1C3E1O1U1S1P3L1A1N1T1
1 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 =19 PTS
DOUBLE WORD → 38TRIPLE WORD → 57
MEANING

What does alliaceous plant mean?