Dear all,

I´m looking for literature (especially that difficult-to-find: very old, very local, languages different to English, etc.) related to differences on the composition and amount of sap or nectar produced by plants, due to differences in soil type. Moreover, the effect of soil on flower traits would be of great interest.

I would prefer works dealing with wild species under natural conditions rather than cultivated plants under management.

Thanks a lot in advance!

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