( ( corolla ( with petals ) ) ( free . ) )
(ROOT (S (NP (NP (NN corolla)) (PP (IN with) (NP (NNS petals)))) (VP (VBP free)) (. .)))
corolla with petals free.
(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.