salicaceae, it is very hard to tell them apart. I have 2 year old P. apulcencis, douglasiana, maximinoii, pseudostrobus (different sources), oocarpa and estevezii, and they all look the same. The southern the source the faster they grow! What is your source of pseudostrobus?

osprey

Most of them we know the source due to id of the parent trees. This one was supposed to be lumholtzii, but has 5-7 needles per fascicle, which is unusual. Very few spp. have been reported with 7 needles. You are right about the faster growth for lower latitudes. Of course, with that comes less hardiness. P. maximinoi seems fastest so far for me, with pseudostrobus not far behind. I have several sources of pseudostrobus. The one pictured was from Sheffield Seeds. I raised it in my greenhouse in Minnesota and then planted it when I moved to FL in late 2006. It had some damage the first winter, but progressively less ever since. This species is planted in several trials around the region and consistently performs well - even in Georgia. I am also trying apulcensis and some forms of pseudostrobus from Jalisco. They seem less hardy, but time will tell.