Although this academic text is a little thick with phrases like "necrosis of the leaf tips" (read: parts died) and "in some genotypes anthers did not dehiscence" (meaning: flower parts on some types didn't open) it does explain what's going on with your plants when they suffer heat stress -- uses a cowpea nee black-eyed peas (not the band) as an example. But overall, the gist:
Reproductive development of many crop species is damaged by heat such that they produce no flowers or if they produce flowers they may set no fruit or seeds.
[by By Dr. Anthony E. Hall, UC Riverside, Botany and Plant Sciences Department]
[pic via Seedman.com]
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