I tend to think it is pravissima, even though I cannot see the second vein in the leaves. The gland(s) on the upper edge of the leaves usually stick out in cultriformis, and it does not in pravissima. The branchlets are hairless and ribbed in pravissima, while those of cultriformis are unribbed and usually waxy. The number of individual tiny flowers in a flower head (about 12 or more) could be either species. 8-12 in pravissima, 13+ in cultriformis.