chong

Carmensol,
The Guineo Monte Cristo you want is apparently the name that Puerto Rico (and some South American countries) has adapted for the type of banana that you describe. I remember that at one time, I saw a website that had a picture of the Puerto Rican banana variety called Monte Cristo, where I saw that it was different from the Bungulan and the internationally known variety as the Monte Cristo. Although I did not find the exact website, while searching the net for it, I found this Puerto Rican recipe book that has a description of “guineo” in it. And from other sources, I found that “guineo”, apparently, came from the Spanish of “Guinea”. The Guinean slaves brought the banana to Puerto Rico, hence the “tree” and fruit were called “guineo”. I copied the text from the book verbatim. I translated the excerpt, but I have not consistently spoken nor written Spanish for more than 50 years, so there might be some disagreements from our Spanish, Castilian, Hispanic (speaking) members, and I welcome any corrections from them. (When making edits, please enclose them in parenthesis so that I will know what was changed. Thanks.)
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Cocine a gusto
By Berta Cabanillas, Berta Cabanillas de Rodríguez, Carmen Ginorio, Carmen Quirce De Mercado
Guineo (Banana). Musa sapientum. Se consigue todo el año; verde se consume como un vegetal y maduro se como fruta y se prepara de distintas maneras. Existen muchas variedades; guarán o gigante, el más grande; niño o de rosa o dátil, es más pequeño; guineo manzano de tamaño mediano; monte Cristy, más corto y grueso que el gigante de color verde y el morado, que es bastante grueso en proporción a su tamaño, de color rojizo morado, sabor ácido, el más barato.

Recipes you will like(probably more appropriately, Favorite Recipes)
Guineo (Banana). Musa sapientum. Available (obtainable) all year. Unripe (green), is eaten as a vegetable, and ripe, eaten as a fruit and prepared in different ways. There are many varieties: Guarán (region in South America, predominantly in Paraguay) or Giant, are the bigger ones; Baby, Rose, or Finger, are the smaller ones; Apple Banana, somewhere in the middle; Monte Cristo, shorter and thicker than huge, with green and purple color, which is fat enough in proportion to such, the reddish purple color, sour (acid) flavor, is (much) cheaper.
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Based on the above, I would conclude that in PR, the Musa Guineo Monte Cristo is synonymous to the variety that is internationally known as Musa Morado. If you look for the Puerto Rican Dwarf Banana, chances are that you will find a plant that is less than 8-ft tall, with less than 50% purple coloration on the p-stem and leaves, and fruits with green and purple coloration. The description above of the “monte Cristy” lends to the common name of “pig banana” (big and fat, and also cheap).

I found the following photos from Ecuador on the net and they were labeled Guineo Morado:



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As to the article linked to by Michael_Andrew (my oldest grandson’s name is Andrew Michael, can you believe that?), the translation of the article by software may be misleading in some phrases. One example is the conversion of the word “cámara”. It was translated as cámara, camera, and chamber in various sentences. The word “verde” could mean unripe or the color green. Relative to that, maduro (mature) definitely means ripe. But the Amarillo can mean Yellow, or it can also mean ripe, just to illustrate ripening by virtue of the change in color. For this particular variety, it can mean both, since the fruit of the PR Guineo Morado is not completely purple, but possessing some shade of green areas (See photos above.) Hence, when the fruit ripens, the green portions will turn yellow upon ripening, with the purple areas showing some yellowing.