What the hell is a "purslane"?

I have been accused by certain people of being a food snob, but I have nothing on these people. The lede:

RICHARD FAULK still recalls, with a twinge of shame, the day he and his girlfriend, Jeanine Villalobos, served store-bought tortillas to guests.

Yes, I've been known to fly all the way to San Francisco to satisfy my burrito cravings — but this is ridiculous.

Oh, and "purslane," for the uninitiated: "A trailing Asian weed (Portulaca oleracea) having small yellow flowers, reddish stems, and fleshy obovate leaves that are sometimes cooked as a vegetable or used in salads."