Those are Talinum paniculatum. There are only four wild species recorded in the US.
Talinum fruticosum only in Florida
Talinum polygaloides found in Arizona, New Mexico and Texas, primarily along the border with Mexico.
Talinum spathulatum only in New Mexico and Texas also along the border.
Talinum paniculatum in most of the southern US.
http://bonap.net/NAPA/TaxonMap...
