The data base is incorrect in some of the naming, Lin, but I will take time soon to correct where I am sure. I have never seen true P. oleracea in anything but yellow. The one that is pik there is mislabeled. Within the next couple of days I am going to go through and figure out how to correct it all.
If you are not a purslane fan, it's easy to make the mistake and name them incorrectly. We will help them!
