I can find these extraordinarily HOT peppers in any grocery store in jars from Mazzetta, Nalley, and you name it. I first had a taste of them way back in the early sixties when I was in elementary school and my Poppa thought it was hugely funny to see how I reacted - and all the info I can find on them is that they are grown in the NAPA Valley, the processing companies claim they are "Cascabel" peppers - which they cannot be because Cascabels are round, not like these at all.
I do know that they are much hotter than any other pepper I can think of, but the lables on the jars will only say:
1) HOT CHILI PEPPERS
2) HOT MEXICAN STYLE CHILI PEPPERS
This has turned out to be one of the great mysteries of the modern age for me, I can't with any degree of certainty identify exactly what they are, I'll try to find an image of a jar of them for reference
Here is an example - I'm sure you've seen these before:
NOTE rounded shoulders and pointed tips, this is not what is shown as a Cascabel in the seed catalogs - nor is it a Cascabella
What on earth are they?
~Whatever they are, they're hot enough that a sauce I made from a jar of them I bought in a store caused some friends from the Carribean Islands (who were well used to VERY hot peppers) asked me "WHAT IS that pepper, MON???"
That was in 2001, and I am still looking for an answer