A wonderful looking plant John.Thanks for showing it .

Members of the pea family have always attracted my attention .

I raised wild collected seed of your variety from AGS of BC 2010 seedx ,however the small seedlings didn't last long.

On the other hand a couple of the Japanese Oxytropis ,( megalantha ,shokanbetsuensis ),flowered in a sand bed for many years .Alas they are no longer with me .

The closest NZr would have to be the scree pea --Montigena novae zelandiae.

Hope you don't mind if i show it here for comparison.
The Montigena can be found from low alpine to subalpine areas.I've only ever found it once and on dark shale like scree that although is dry on the surface ,has permanently moist soil underneath .

I once germinated seed and kept a plant growing for a few seasons repotting evey year as it seemed to grow out towards the edge of the pot.Never reached flowering size however. Cry Cry

I sowed seed from last years NZAGS seedex --nothing up yet.........

Winter conditions --most likely plants would be under snow cover ---the oceanic effects mean NZ has relatively mild winters --cool summers in the mountains -- lows have been recorded as -15c at high alpine level near the area where i located the colony.

Cheers Dave.