Bambusa textilis, B. chungii, B. tuldoides

http://www.bambooweb.info/

... choose the Genus Bambusa, then look at the pix.

You'll need several plants to cover 30 ft, say 1 plant every 5 or 6 ft. it will take 2 or 3 years to get a wall of green leaves.

Depending on what zone you are in, you can decide from several species. I would recommend some of the Bambusa multiplexes(aka hedge bamboo) for a height around 20 feet and culms around 1 1/2 inches thick. You will have to get a taller bamboo for thicker culms, but they are not as dense growing and you will be able to see through them.

If it never freezes in your area, you can go with a Dendrocalamus, Guadua, or a Gigantichloa, but they can get quite large.

Kt

Email me and I will give you some places in your area where you can buy bamboo.

Check the link below for sources. North Hollywood Florida or California?

Roy

Here is a link that might be useful: Bamboo Sources @ Bambooweb.info