( plant ( ( is ( ( common ( high ( altitude forests ) ) ) ( as ( an ( understory tree ) ) ) ) ) . ) )
(ROOT (S (NP (NN plant)) (VP (VBZ is) (NP (NP (JJ common) (JJ high) (NN altitude) (NNS forests)) (PP (IN as) (NP (DT an) (JJ understory) (NN tree))))) (. .)))
plant is common high altitude forests as an understory tree.
(ROOT (S (NP (NP (DT The) (NN understory)) (PP (IN of) (NP (DT the) (NN rainforest)))) (ADVP (RB commonly)) (VP (VBZ has) (NP (NP (NNS ferns)) (CC and) (NP (JJ other) (NN ground) (NNS plants)))) (. .)))