( ( Flowering Plants ) ( -LRB- ( Angiosperms -RRB- ) ) )
(ROOT (NP (NP (NNP Flowering) (NNP Plants)) (PRN (-LRB- -LRB-) (NP (NNP Angiosperms)) (-RRB- -RRB-))))
Flowering Plants  (Angiosperms)
(ROOT (S (NP (NNS Angiosperms)) (VP (VBP are) (NP (NP (DT the) (ADJP (RBS most) (JJ successful)) (NN phylum)) (PP (IN of) (NP (NNS plants))))) (. .)))
Angiosperms are the most successful phylum of plants.