( ( Some species ) ( also ( ( ( ( ( ( ( ( ( reproduce ( by ( producing ( modified ( stems ( , ( called ( ( stolons or ) runners ) ) ) ) ) ) ) ) , ) ( that ( ( crawl along ) ( the ground ) ) ) ) , ) ( take root ) ) , ) and ) ( form ( new plants ) ) ) . ) ) )
(ROOT (S (NP (DT Some) (NNS species)) (ADVP (RB also)) (VP (VP (VB reproduce) (PP (IN by) (S (VP (VBG producing) (NP (VBN modified) (JJ stems) (, ,) (VBN called) (NNS stolons) (CC or) (NNS runners))))) (, ,) (SBAR (IN that) (S (VP (VB crawl) (PRT (RP along)) (NP (DT the) (NN ground)))))) (, ,) (VP (VB take) (NP (NN root))) (, ,) (CC and) (VP (VB form) (NP (JJ new) (NNS plants)))) (. .)))
Some species also reproduce by producing modified stems, called stolons or runners, that crawl along the ground, take root, and form new plants.
(ROOT (S (S (NP (DT Some) (NNS plants)) (VP (VP (VBP have) (NP (NNS stolons))) (, ,) (CC or) (VP (VBZ stems)))) (, ,) (NP (DT that)) (VP (VP (VBP run) (PRT (RP along)) (NP (DT the) (NN ground))) (CC and) (VP (VBP are) (ADVP (RB commonly)) (VP (VBN called) (NP (NNS runners))))) (. .)))