Any Dendrologists in the House? Palms vs. Palmettoes

What is the difference between palm trees and palmettoes? How closely are they related? Any links to pictures for comparison would be great. Thanks.

The term palmetto refers to a number of smallish, low-growing species of palms, typically those from which edible palm-hearts are taken.

Palmettoes are palms (but not all palms are palmettoes).

Gee, I thought a sexy topic like this would take off like a rocket. Does nobody besides me have strong feelings about the controversial Palms vs. Palmettoes issue?

Thanks for your contribution, Mangetout.