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I haven't posted here in awhile but One of the echeverias in one of my outdoor bed has grown a terminal flower stalk instead of the usual radial flower stalks typical to the species, What is also unusual is that has been flowering since June, while my other plants of the species stopped flowering in august or early September.

That's interesting. My first guess was it's an intergeneric hybrid with a genus that grows terminal flower stalks, like Sedum. But it looks like it grew the terminal stalk in addition to the normal ones. That's very strange. Do you have an ID for the plant?

Apparently some Echeveria hybrids are prone to doing this. If you google "Echeveria terminal flower" you can find others doing this. Who knows if this is a sign of Sedum ancestry, or just bad hybrid genetics? Another interesting question, is this group of hybrids monophyletic? And are there any Echeveria species that do this?

this is one of the common echeverias, I think secunda its not a hybrid, but one of many of this species that I had mostly grown from a couple plants

Also see this topic:
http://cactiguide.com/forum/viewtopic.php?f=12&t=13971
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Based on some further research, this trait seems to be widespread if not commonly expressed among Echeveria species. I think the hybrids tending to do this is just a reflection of the fact mostly hybrids are grown in cultivation. I wonder if this indicates that Echeveria's ancestor produced exclusively terminal inflorescences. Or if their descendents might someday. Also makes me wonder, are there Echeveria species that normally flower like this, discovered or undiscovered? So many questions