Be sure they will survive in your climate, because you looked at a nursery in OR. Try Musser Forest in PA. I lived up on the "lake" and winters there can be brutal.

Here is a link that might be useful: Propagating Perennials

I'm not familiar with some of those, which makes me think those particular ones may have seldom been in commerce on this continent, if ever. When you hanker for such plants jumping on them when they happen to be on offer may be the only way to get them, rather then making a list and then looking for them as though they would be available all the time, somewhere. Or getting seeds and growing your own, from a collector or collection here or abroad. A few items it may boil down to seeing if you can get permission to pick some spent fruits up off the ground at a facility like the National Arboretum. Collecting and growing your own also has the advantage - in addition to it being perhaps the only way you can get a rare tree - of giving you the chance to see the parent plant(s). Otherwise you have to hope the nursery is sending you the true item. On one of the rose forums awhile back I saw griping about forestfarm sending out species roses that weren't correct, assuming the poster wasn't being misled by the tendency for rose seedlings to look alike when small this served as a reminder that nurseries like forestfarm depend on their suppliers sending them the correct seed.

I also agree that some you seek here will not be likely to live there - but maybe you have a container garden and cool greenhouse. I don't know where you can find a better offering of such plants than forestfarm, who is left back east now? Arborvillage? I know I've seen web sites of a few others that have rare stuff, but it seemed that when the original Heronswood was still operating out here it and forestfarm led the pack by far. A quiet little sister to these was Colvos Creek nursery, they are still at it but much of their line is Zone 8 and up stuff - you might want to monitor their offerings anyway as some of it is extremely rare.

Brotzman nursery in Ohio (Lake County area) has A. pilosum & cissifolium listed in larger B&B sizes - try contacting them to see if they have any smaller sizes (or seed) available. I think Piroche Plants (British Columbia) may list Tapiscia, and I think they ship to the US (bboy may know?).

First off thanks for the quick responses guys. Bullthistle and bboy you guys are right, some of that stuff will probably prove to be not hardy here. Being extremely rare however, many of them have not been adequately tested so I'm willing to gather some performance data on them. Let's just say I'm not exactly doing this "research" (research shouldn't be fun) in a vacuum, and if any of these plants are successfull, some leading horticulturists will be invitied to check them out and spread the word in terms of their adaptability. A good example so far is Acer oliverianum; supposedly the Morton in zone 5 grows it successfully and I have one here that's doing ok (still small but too big for snow or other protection). Acer wuyuanense and schneideranum are close relatives with similarly unknown cultural tolerances, which is what piqued my interest in them.

In terms of the availibility, it appears that arborvillage has gone under, although I spoke to one of the sons and apparently the father still does some occasional propagating. They had several of the species I listed above and I will miss browsing their selection every season. Arbordave, I have seen Tapiscia offered by Piroche but it was my understanding that they don't do retail, although I could be wrong. Plus they are in Canada. I will however, check out omse of the other sources listed.

Thanks again guys!

Piroche has supplied US retailers in the past, probably it has been a large part of their business. Two other wholesale companies that might have a few of the maples or at least others that could interest you are Stanley & Sons and Buchholz & Buchholz. The latter I don't think is showing the species you have listed but has other rare maples etc. Garden centers here with buyers interested in stocking the kind of plants they offer buy from them, as does forestfarm. Stanley & Sons I have seen recently on Conifers forum will trade with the public if a purchaser belongs to the Conifer Society and makes a minimum order.

Both have catalogs online.

I didn't go but last summer Buchholz nursery was part of the tours available as part of the Farwest nursery trades show in Portland. The nursery's Flora Wonder arboretum was said to house about 4000 kinds of plants.

Oriental Supply Garden south of rochester has a selection of maples. Check out his web site.

I just started a new job as Sales Manager at a wholesale nursery in Everett, Washington, called Hima Nursery. We have several exotic maples that you might be interested in, including a couple that pteroceltis was interested in. The vast majority of our inventory is large-caliper stuff, though. I'm in the middle of taking inventory. Contact me and I can email an availability list. jeff@himanursery.com