I am in central Alberta, about 75 km south west of Edmonton, in Aspen Parkland eco-zone. I have several groves of paper birch in my collection of forests. One, however is a bit strange, in that the bark colour is wildly variable. I've attached a couple of samples. Initially I thought they were B. nigra, but the USFS Silvics manual says that B. nigra is an eastern species, and it's not been a popular landscape tree until recently. I also considered B. fontinalis (or occidentalis) but the pictures I've found show it to be shrubby, although there are some mentions of it being up to 30 feet high. My suspicion is that they are hybrids of some sort, but not sure from what. 1. Is it reasonable that I may have a mixed stand of B. fontinalis and B. papyrifera? 2. Are these colour variations normal for non-hybridized paper birch? 3. Other possibilities? *** The salmon barked one, in particular I would like to propagate. Can birch be propagated by cuttings?