ID this bamboo? 1-2" diameter, Sydney, Australia

[Lil Nate]

Can you ID this bamboo species, 1-2" diameter?

[Mark Meckes]

Hi Lil Nate,
Very interesting long internodes of this bamboo species, which provides one clue to ID.
Are you able to take a measurement of the average length between nodes and longest internode length?

Is this bamboo growth habit a clumper or has it spread it's rhizomes and established a more widespread grove?

Again, more pics of the whole planting, and close ups including new shoots would be most helpful.

Mark