Poblano

The poblano  is a mild chili pepper originating in the state of Puebla, Mexico. Dried, it is called ancho or chile ancho, from the Spanish word ancho ("wide"). Stuffed fresh and roasted it is popular in chiles rellenos poblanos.

While poblanos tend to have a mild flavor, occasionally and unpredictably they can have significant heat. Different peppers from the same plant have been reported to vary substantially in heat intensity. The ripened red poblano is significantly hotter and more flavorful than the less ripe, green poblano.

A closely related variety is the mulato, which is darker in color, sweeter in flavor, and softer in texture. The pasilla pepper is sometimes incorrectly called "poblano", particularly in the United States, but they are distinct from true poblano peppers.

Source: Google, Wikipedia, Rareseeds, Johnny's Seeds.