( ( ( ( Others , ) ( who ( perhaps ( should ( know better ) ) ) ) ) , ) ( ( fail ( to ( recognize ( ( the distinction ) ( between ( ( ( the ( lovely ( five-leafed ( Virginia creeper ) ) ) ) and ) ( the ( three-leafed ( poison ivy ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Others)) (, ,) (SBAR (WHNP (WP who)) (S (ADVP (RB perhaps)) (VP (MD should) (VP (VB know) (ADVP (RBR better)))))) (, ,)) (VP (VBP fail) (S (VP (TO to) (VP (VB recognize) (NP (NP (DT the) (NN distinction)) (PP (IN between) (NP (NP (DT the) (JJ lovely) (JJ five-leafed) (NNP Virginia) (NN creeper)) (CC and) (NP (DT the) (JJ three-leafed) (NN poison) (NN ivy))))))))) (. .)))
Others, who perhaps should know better, fail to recognize the distinction between the lovely five-leafed Virginia creeper and the three-leafed poison ivy.
(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))))) (. .)))