pequins that I buy from Mexican store, are much bigger than any pea that I know. First, they are not round but elongated , about 1/2 inch, diameter about 1/4 inch.
Right now I am trying to germinate some.

Search THIS forum for Texas wild chili pepper and pequin.
There you will find pictures.

The little round BB sized peppers that start off green and ripen to red are the chiltepins - this type is the wild pepper. The chile pequin is the domesticated type and is larger. I am of the sort that believes the pequin to be at some point a version of a cross between chiltepin/something elese. Not sure if its become its own pepper or still a cross - I've never tried to grow them or seen them grown to see if they grow true.

Chiltepin

Pequin
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Here is a pic from the web that I could find which closely resembles the chile growing in my backyard.

Here is a link that might be useful: Similar to mine.

That picture looks like a pequin to me.
Danny

pourovargas,

The picture depicts pequins. But not ROUND , as you said before.

I've been eating food cooked with tepins as seasonings for over 50 years. I decided to grow some a few years back by planting seed from dried tepins. The success rate was about 1 in 20 to get a plant that actually grew to something that would bare fruit. The plants died after two years. Last year I repeated the procedure and only got two plants that produced. The funny thing is they aren't producing berries, they look like small (very smal) jalapenos. They are now producing for the second time and the chilies are over an inch long and extremely hot. The only seeds I planted were from the tepins.....strange.