I didn't post those names, someone in the plant data base did. So I will address it and see that they change it so at least here on ATP we have the correct names. Thanks for pointing it out. Neither one is grandiflora.
The purslane we see here in the nurseries:
The portulaca (Moss Rose in my terms)
(Photo by Maridell)
Vicki, you are involved in the data base, who do I contact?