( ( Floral ( organ primordia ) ) ( ( ( ( ( ( arise in ) ( ( ( ( rings , ) or ) whorls ) , ) ) ( on ( ( the flanks ) ( of ( the ( floral meristem ) ) ) ) ) ) , ) ( with ( ( ( ( ( ( ( sepals ( in ( whorl 1 ) ) ) , ) ( petals ( in ( whorl 2 ) ) ) ) , ) ( stamens ( in ( whorl 3 ) ) ) ) and ) ( carpels ( in ( whorl 4 ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Floral) (NN organ) (NN primordia)) (VP (VBP arise) (PRT (RP in)) (NP (NP (NNS rings)) (, ,) (CC or) (NP (NNS whorls)) (, ,)) (PP (IN on) (NP (NP (DT the) (NNS flanks)) (PP (IN of) (NP (DT the) (JJ floral) (NN meristem))))) (, ,) (PP (IN with) (NP (NP (NP (NNS sepals)) (PP (IN in) (NP (JJ whorl) (CD 1)))) (, ,) (NP (NP (NNS petals)) (PP (IN in) (NP (JJ whorl) (CD 2)))) (, ,) (NP (NP (NNS stamens)) (PP (IN in) (NP (JJ whorl) (CD 3)))) (CC and) (NP (NP (NNS carpels)) (PP (IN in) (NP (JJ whorl) (CD 4))))))) (. .)))
Floral organ primordia arise in rings, or whorls, on the flanks of the floral meristem, with sepals in whorl 1, petals in whorl 2, stamens in whorl 3 and carpels in whorl 4.
(ROOT (S (S (NP (NP (NNS Sepals)) (, ,) (NP (NNS petals)) (, ,)) (VP (VBZ stamens))) (, ,) (CC and) (S (NP (NNS carpels)) (VP (VBP are) (NP (JJ floral) (NNS organs)))) (. .)))