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I'm guessing they would be Filifera. They seem to miraculously defy extreme cold temperatures in arid climates like NM.

Thanks for your help. There was about 10 of these planted in the same lot, and about half of them had been cut down. The fact that 50% of these survived -13 is amazing! I wouldn't be surprised if the USDA hardiness rating on the Filifera (assuming that's what this is) gets lowered in the future.

They all look like Filibusta to me.

I sure hope not! A Filibusta is less cold hardy, correct? What feature makes them look like Filibustas?

I agree with Jim, look like filibustas. Robusta has a reddish trunk, much thinner and tall. Filifera would have a grayish trunk but much fatter. Those trunks look too thin to be pure filifera.
Just because they're a hybrid doesn't necessarily mean they're less cold hardy than the hardier parent plant.

All are filibustas.

I guess I'm growing Filibustas, then. I'll just hope that they're as cold hardy as a Filifera.

Some will be some won't be if they are hybrids(even if they are not for that matter)....this is why for my garden,I sowed,raised or bought several of one variety in case I lost one but also to plant the toughest one when it was possible to discern that prior to planting...the other way is to find out after(-: