( ( Classification ( of ( spore-producing organisms ) ) ) . )
(ROOT (NP (NP (NN Classification)) (PP (IN of) (NP (JJ spore-producing) (NNS organisms))) (. .)))
Classification of spore-producing organisms.
(ROOT (SINV (PP (IN Within) (NP (DT the) (NNS petals))) (VP (VBP are) (NP (NP (CD two) (NNS whorls)) (PP (IN of) (ADJP (JJ fertile))))) (NP (NP (JJ floral) (NNS organs)) (SBAR (WHNP (WDT that)) (S (VP (VBP produce) (NP (NNS spores)))))) (. .)))