Poisonous Flower Nectar. Bees foraging on the flowers of yellow jessamine have appeared intoxicated became paralyzed and died. In this manner can humans eat flower nectar.
For more info you could probably contact Univ of TX at Austins entomology dept. Its possible that the toxin is an adaptation that allows the plant to filter out the less preferred bees and conserve the nectar reward for just bumblebee pollinators which can tolerate the toxin. They are equally poisonous for humans as well for cats and dogs as mentioned by ASPCA on its website.
Consumption of the plant or any of its secondary products including mad honey can cause a rare poisonous reaction called grayanotoxin poisoning mad honey disease honey intoxication or rhododendron poisoning.
Given below is the list of flowers few of which are poisonous flowers to touch even let alone ingesting them. 05052021 Highly Toxic flowers. A tenured entomologist and beekeeper from Univ of TX who showed up at the beekeepers meeting of Central TX to lecture to us about toxic oleander nectars negative effects on hives of cultivated and wild bees. They are equally poisonous for humans as well for cats and dogs as mentioned by ASPCA on its website.