( ( With ( ( ( ( rhododendrons , ) azaleas ) and ) ( other ( ericaceous plants ) ) ) ) ( , ( ( ( a ( yellow color ) ) ( between ( the ( leaf veins ) ) ) ) ( ( ( is usually ) ( ( a clue ) ( to ( a ( pH problem ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN With) (NP (NP (NNS rhododendrons)) (, ,) (NP (NNS azaleas)) (CC and) (NP (JJ other) (NNS ericaceous) (NNS plants)))) (, ,) (NP (NP (DT a) (JJ yellow) (NN color)) (PP (IN between) (NP (DT the) (NN leaf) (NNS veins)))) (VP (VBZ is) (ADVP (RB usually)) (NP (NP (DT a) (NN clue)) (PP (TO to) (NP (DT a) (NN pH) (NN problem))))) (. .)))
With rhododendrons, azaleas and other ericaceous plants, a yellow color between the leaf veins is usually a clue to a pH problem.
(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)))) (. .)))