( ( Corolla The ) ( ( ( petals , ) collectively ) . ) )
(ROOT (S (NP (NNP Corolla) (NNP The)) (VP (VBZ petals) (, ,) (ADVP (RB collectively))) (. .)))
Corolla The petals, collectively.
(ROOT (S (NP (NP (DT All)) (PP (IN of) (NP (DT the) (NNS petals)))) (ADVP (RB together)) (VP (VBP are) (VP (VBN called) (NP (DT a) (NN corolla)))) (. .)))
All of the petals together are called a corolla.