( ( The ( specific epithet ) ) ( ( refers ( to ( ( ( ( the ( plant 's ) ) ( pale ( leaf veins ) ) ) and ) ( lower ( leaf surfaces ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ specific) (NN epithet)) (VP (VBZ refers) (PP (TO to) (NP (NP (NP (DT the) (NN plant) (POS 's)) (JJ pale) (NN leaf) (NNS veins)) (CC and) (NP (JJR lower) (NN leaf) (NNS surfaces))))) (. .)))
The specific epithet refers to the plant's pale leaf veins and lower leaf surfaces.
(ROOT (S (NP (NNS Leaves)) (VP (VBP export) (NP (NN sugar)) (PP (TO to) (NP (NP (NNS roots)) (CC and) (NP (NP (JJ other) (JJ nonphotosynthetic) (NNS parts)) (PP (IN of) (NP (DT the) (NN plant)))))) (PP (IN through) (NP (DT the) (NNS veins)))) (. .)))