( ( ( ( ( ( ( The ( second meristem ) ) , ) ( the cambium ) ) , ) ( which ( lies ( between ( ( ( the ( primary xylem ) ) and ) ( the ( primary phloem ) ) ) ) ) ) ) , ) ( ( ( produces ( secondary ( xylem cells ) ) ) ( around ( ( ( ( the center ) ( of ( the root ) ) ) and ) ( ( secondary ( phloem cells ) ) ( around ( ( the outside ) ( -LRB- ( 474 -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ second) (NN meristem)) (, ,) (NP (DT the) (NN cambium)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ lies) (PP (IN between) (NP (NP (DT the) (JJ primary) (NN xylem)) (CC and) (NP (DT the) (JJ primary) (NN phloem))))))) (, ,)) (VP (VBZ produces) (NP (JJ secondary) (NN xylem) (NNS cells)) (PP (IN around) (NP (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (NN root)))) (CC and) (NP (NP (JJ secondary) (NN phloem) (NNS cells)) (PP (IN around) (NP (NP (DT the) (NN outside)) (PRN (-LRB- -LRB-) (NP (CD 474)) (-RRB- -RRB-)))))))) (. .)))
The second meristem, the cambium, which lies between the primary xylem and the primary phloem, produces secondary xylem cells around the center of the root and secondary phloem cells around the outside (474).
(ROOT (S (NP (NNS Roots)) (VP (VBP grow) (PP (IN in) (NP (NN length) (CC and) (NN width))) (PP (IN from) (NP (DT the) (JJ primary) (CC and) (JJ secondary) (NN meristem)))) (. .)))