Wow, where did you get it? I've been looking around for awhile.
Marselia hirsuta also known as Marselia quadrifolia. Here's some of my bookmarked links about it:
http://rubick.com:8002/aquarium/plants/groundcover
Erik Leung's site
From what I gather, it's a low demand, slow growth plant like Marsilea crenata, java ferns and anubias.
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