For Guy Poppy and his field beans...
the book by Kearns and Inouye is just out and full of methods for
nectar analysis.  there are glucose spot test papers for diabetics'
urine testing available in chemists' shops, and some types are semiquantitative
and will give an answer for a single bean flower's nectar.   Baker and Baker
developed a field technique for estimating amino acid concentration.
There are small-scale field methods of TLC for amino acids too.
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