Shouldnt it have yellow spines?

I'm not sure now that I can see it more clearly, the pale spines sway my thinking, could be M. pottsii (M. leona).

CP

I still think its M. elongata. Colour is variable, spines are variable (often with no centrals at all). I think the variation has been increased by hybridisation.

M. pottsi has unusual flowers and you'll know it in an instant if it flowers.

S&B you're possibly right, and M. pottsii has centrals that are upward pointing...flowers are a brownish-red colour. Here's a pic of my young M. pottsii(leona)... now deceased. :(

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CP