This one might belong to the genus Galium, it actually reminds me of Galium odoratum, which is very common in my area. http://www.projectnoah.org/spottings/6185070
Here are some more links you might want to check.
http://en.wikipedia.org/wiki/Galium
http://en.wikipedia.org/wiki/Galium_odoratum
http://eol.org/pages/1107990/overview
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