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Aeschynomene americana
You're welcome Jason, not like what you think I am in progres of learning about plants, too. I love to watch them around my place and know their vernacular name then I search for the binomials or ask some friends if I don't have a clue or confused. Some of my plants are not identified yet, too.
I've seen the link you gave but sorry I couldn't help, I wish I found it too so I can ask my friends in Flickr for help.
Thanks again for the ID Nenik! I think you know Indonesian plant very well.. Maybe you can ID this ( http://www.projectnoah.org/spottings/171... ) plant too, I found it near Borobudur temple.. Thank you..