( ( Angiosperms ( -LRB- ( ( flowering plants ) -RRB- ) ) ) ( ( were ( ( the ( original source ) ) ( of ( most ( plant medicines ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Angiosperms)) (PRN (-LRB- -LRB-) (NP (JJ flowering) (NNS plants)) (-RRB- -RRB-))) (VP (VBD were) (NP (NP (DT the) (JJ original) (NN source)) (PP (IN of) (NP (JJS most) (NN plant) (NNS medicines))))) (. .)))
Angiosperms (flowering plants) were the original source of most plant medicines.
(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.