subshrub

NOUN /səbʃrəb/
8 LETTERS · 2 SYLLABLES · STARTS WITH S

subshrub is a valid 8-letter word worth 15 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1U1B3S1H4R1U1B3
1 + 1 + 3 + 1 + 4 + 1 + 1 + 3 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does subshrub mean?