( ( ( ( Embryo-sac ( development Allium ) ) - ) type ) . )
(ROOT (NP (NP (NNP Embryo-sac) (NN development) (NNP Allium)) (: -) (NP (NN type)) (. .)))
Embryo-sac development Allium -type.
(ROOT (S (NP (NP (DT The) (JJ amniotic) (NN sac)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (VBG sitting) (PP (IN on) (NP (NP (NN top)) (PP (IN of) (NP (DT the) (JJ flat) (NN embryo))))))))) (, ,)) (VP (VBZ envelops) (NP (DT the) (NN embryo)) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ folds))))) (. .)))