lorax

Aha, so I'm not wrong. Guineo Morado is grown quite extensively in the Monticristi region, so I'm betting that is where they get their name in Ecuador at least.

And oddly enough, I've purchased bananas from the huts in those pictures - they're on the way to Baños.

Here's the skinny on what I've got for common names in my travels.

Guaránes are also called Maqueños in Ecuador and Colombia, and they're about as thick around as my wrist and as long as my forearm. They're generally made into cakes. Niña, rosa, and datíl are three distinct sizes, and in the case of rosas, colours of small-fingered bananas. Datíles are the sweetest and smallest of the three, and in Ecuador we commonly call Niñas "Oritos" (little golden ones). Monticristis, Morados, and Rosados are red-purple, and fairly large - there appears to be a regional difference to the naming of the banana, with the highlands favouring Morado and Rosado, and the coast favouring Montecristi.

Guineo is also the blanket term for sweet yellow bananas.