It is Aptenia cordifolia, Hearts & Flowers.

~Rosemarie

Thanks Rosemarie!
Also called Baby Sun Rose.....hardy to 23 degrees F. Well, that's not "hardy" for my yard.

WindsurfGirl

There are different colors of this ice plant. I have seen a red, purple, and crème or yellow variety. Here is a picture with the red & one purple flower (other ice plants/succulents are mixed in).

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There is a picture of the white variety at this link  evidentially it originated from Israel. It is not as hardy as the red.

http://www.mediterraneangardensociety.org/plants/Aptenia.cordifolia.cfm