Thanks!

Looks similar, but it's definitely not a runner. Any other possibilities?

Shameless bump. Thanks!

Compare with Semiarundinaria.

Thanks. The appearance is very similar, but the growth behavior isn't.

(I have started to record what I plant...too late for this one though!)

Running bamboos planted in dry situations often remain in clumps for indefinite periods. The distance the new shoot in your second shot is from the parent clump shows that the tight habit of the first shot is not characteristic.

Hmmm Good point. I think I will have to do some digging to confirm!

The only difference between clumping and running is how far the rhizomes go before throwing up culms, you can already see from the location of the one shoot that the variety is not limited to producing very short sections of rhizome.