Chili peppers of the world: cultivars, species, and heat
notesfromtheroad.com
notesfromtheroad.com
> Capsaicin, the compound that makes chili peppers hot is an evolutionary filter designed to punish mammals and reward birds.
This is an outdated assumption, with no data behind it. (Yes, birds are immune, but that's not enough to prove this is why peppers evolved capsaicin, and in high levels.)
Capsaicin is a fungicide, and a survey showed that Scoville Heat Units (SHU), a measure of how much capsaicin is in a pepper (or hot sauce), varied quite reliably with local levels of a wild fungus that plagues pepper plants.
Surviving infection is far more important than selecting for slightly better distributors of the seeds.
The issue wasn't the illustrations themselves so much as the taxonomy and the text around them. I've updated both entries to explain the distinction more clearly. Thanks for catching it — it was a legitimate point.
A interactive map with that info would be awesome!