( ( Poison ivy ) ( always ( ( grows ( in ( leaves ( of three ) ) ) ) . ) ) )
(ROOT (S (NP (NN Poison) (NN ivy)) (ADVP (RB always)) (VP (VBZ grows) (PP (IN in) (NP (NP (NNS leaves)) (PP (IN of) (NP (CD three)))))) (. .)))
Poison ivy always grows in leaves of three.
(ROOT (S (NP (NN Poison) (NN ivy)) (ADVP (RB typically)) (VP (VBZ has) (NP (NP (CD three) (NNS groups)) (PP (IN of) (NP (NNS leaves))))) (. .)))