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I don't know all the different types but there is red purslane, golden purslane, portulaca purslane, and horse purslane.
These are just a few that I know of.
The family that purslane belongs to is the Portulacaceae. Purslane is often called moss rose.
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Purslane.
It is also called Winter Purslane...of the 'claytonia' family. Common Purslane is rich in Omega 3 fatty acids.