( ( DISPERSAL ( ROUTES ( , ( VECTORS ( , ( INFESTATION ( SOURCES ( Vegetative reproduction ) ) ) ) ) ) ) ) ( ( can ( ( ( be ( extremely rapid ) ) , ) ( when ( ( ( stolons ( -LRB- ( runners -RRB- ) ) ) ( from ( a parent ) ) ) ( stem ( ( extend horizontally ) ( beneath ( ( the ( water surface ) ) ( carrying ( ( a ( terminal bud ) ) ( which ( grows ( into ( a ( new plant ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP DISPERSAL) (NNPS ROUTES) (, ,) (NNP VECTORS) (, ,) (NNP INFESTATION) (NNPS SOURCES) (NNP Vegetative) (NN reproduction)) (VP (MD can) (VP (VB be) (ADJP (RB extremely) (JJ rapid)) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (NP (NP (NNS stolons)) (PRN (-LRB- -LRB-) (NP (NNP runners)) (-RRB- -RRB-))) (PP (IN from) (NP (DT a) (NN parent)))) (VP (VBP stem) (VP (VB extend) (ADVP (RB horizontally)) (PP (IN beneath) (NP (NP (DT the) (NN water) (NN surface)) (VP (VBG carrying) (NP (NP (DT a) (NN terminal) (NN bud)) (SBAR (WHNP (WDT which)) (S (VP (VBZ grows) (PP (IN into) (NP (DT a) (JJ new) (NN plant)))))))))))))))) (. .)))
DISPERSAL ROUTES, VECTORS, INFESTATION SOURCES Vegetative reproduction can be extremely rapid, when stolons (runners) from a parent stem extend horizontally beneath the water surface carrying a terminal bud which grows into a new plant.
(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))))) (. .)))