<< What species of bamboo is it? >>
It's not bamboo at all, but its "street name" is lucky bamboo. As far as I can see, it's a weed from Taiwan. Some dude in Taiwan is cursing up a storm as he rips the crap out of his garden, meanwhile his next door neighbor his grabbing the stalks out of the trash and mailing them to his brother in the US who is selling said weeds at a gargantuan profit.
The American dream at work.
I have a bunch of the stuff...it grows very well in my 2.5gal betta fish tanks. Lots of fertilizer, I guess.
People pay insane money for them....I got 3 2" stalks for $1 not too long ago, and a few 6" stalks for about $4. Some places sell them for like $14 or more depending on the size/shape of the stalk.
Edit: the scientific name is Dracaena sanderana. Most people should recognize lucky bamboo.