( Angiosperms ( ( form ( ( ( a phylum ) , ) ( the ( phylum Anthophyta ) ) ) ) . ) )
(ROOT (S (NP (NNS Angiosperms)) (VP (VBP form) (NP (NP (DT a) (NN phylum)) (, ,) (NP (DT the) (NNP phylum) (NNP Anthophyta)))) (. .)))
Angiosperms form a phylum, the phylum Anthophyta.
(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.