sure enough the name has been changed probably so they can actually get a price for a plant that grows wild all over...LOL

That is a good theory :)

Vinca is a genus of six species (wiki). The one you are likely referring to is Vinca Rosea

Genus: Vinca
Species: rosea
Common names: Madagascar periwinkle

http://www.crescentbloom.com/Plants/Specimen/VI/Vinca%20rosea.htm

Mystery solved - the store is using the correct Lain/scientific name as opposed to the common name :)

They've gone by both names as long as I can remember. When I'm trying to think of the name of the color, my mind always calls up "vinca" first, then I can remember "periwinkle." Funny how brains work.

But! What the Big Box stores carry are a Hybred. Periwinkles are the wild ones that self seed, the Hybreds don't.

The hybrids I have bought at Lowes re-seed but not the same color, and I like the volunteers better. They're bigger and taller - not just mounds. Unfortunately, the really hard freezes we had killed them for good this winter. They have not come back.

Sherry

I have them all over my flower beds. They re-seed everywhere. I have many different colors. I only planted a couple of plants several years ago and now have a bunch, love them.

Here is a link that might be useful: Vinca colors

Well purslane/portulaca, and lantana grow wild all over Fl.too, but are still called...purslane/portulaca and lantana...soooooooo? it's not nice to confuse old people.. lol P.S. the tag said:
Vinca
(cora)

I call them periwinkles too. Never can remember to call them vincas.