( These ( ( stem ( modifications ( include ( corms ( , ( bulbs ( , ( rhizomes ( , ( runners ( , ( stolons ( , ( ( tubers and ) crowns ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP stem) (SBAR (S (NP (NNS modifications)) (VP (VBP include) (NP (NNS corms) (, ,) (NNS bulbs) (, ,) (NNS rhizomes) (, ,) (NNS runners) (, ,) (NNS stolons) (, ,) (NNS tubers) (CC and) (NNS crowns)))))) (. .)))
These stem modifications include corms, bulbs, rhizomes, runners, stolons, tubers and crowns.
(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))))) (. .)))