( ( competition ( from ( other ( understory plants ) ) ) ) . )
(ROOT (NP (NP (NN competition)) (PP (IN from) (NP (JJ other) (NN understory) (NNS plants))) (. .)))
competition from other understory plants.
(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)))) (. .)))