Hey Flame;
Good Topic and one that is partial to me..
My first encounter with a Tepin goes back almost 20 years, I was working as a Backhoe operator after getting out of the service for a well-to-do Texas city and when not on a emergency dig I spent alot of time snoozin in the passenger seat of a city truck cause I was in a band at night and most of the time I was a lil sleep-deprived/hungover, so my crew and I were cruising alleys killing time till payday, while my driver, Sancho, kept scouting out the rich peoples throw-aways or trash to take home with him, one day I was half awake and like a sniper he spotted a plant by a tree below a fence and jumped out of the truck and started picking away like a demon, well it was lunchtime so I asked him for one of this lil bb-size peppers to eat with my sandwich, so I did eat it, and I will never forget that day, my first real burn, it was a turning point in my heat tolerance of course Sancho was laughing his butt off the whole time. I will never forget that day
In my honest opinion this is a real grey area, a lot of people call Pequins -> Tepins and Tepins -> Pequins, but they are not the same...The true Tepin comes from a mountainous region in Mexico, perhaps the Sonora Mountains, just trying to recall w/o checking my notes...
But the real Tepins are the round ones and are genetically the "Mother of all Pepper Plants" and they will have the real woody stem and come back every season and can live from 20-30 years in a nice sandy Texas river bottom, The Pequins are something else, I can just look at them and tell they are not the same, the stems are not wood-like and fuzzy and kind of have a purple color, remind me of a Serrano...
Bottom line is true Tepin's are an acquired taste, but once they get you hooked, you will love them forever!!
God Bless and Be well