I hope this reference can help...

Chile Piquin
Locality: Puebla Mexico
Color: From green ripening to orange-red
The Piquin is one of the ancestors of domesticated Chiles. Very tiny and slightly pointed, it grows wild in South Texas and Mexico. Treasured for its unique flavor and heat. This chile plant can be grown in a pot (Use a 3-5 gallon size) and brought indoors to "winter over". Grows 3 foot tall by 2 foot wide under ideal conditions. The seeds are considered difficult to start so follow our growing tips carefully. 120 days or more from transplants, better yields the second year. You won't find this chile down at the local food store or nursery! The word "piquin," also spelled "pequin" is possibly derived from the Spanish pequno ("small"), an allusion to the size of the fruits. Variations on this form place the words "chile" or "chili" before or in combination with both the words "pequin" and "tepin." The Wild from of the piquin type, variously called "chiltepin" and "chiltecpin," may be both the nomenclature and the botanical predecessor of the piquin. It is possible that the word "chilepequin" is derived from the Nahuatl "chiltecpin" (chilli + tepectl, "flea chile") rather than from pequeno. Some of its common names are "chile mosquito", "bird pepper", "chile bravo", and "the Cowboy pocket spice".