The newer one is out of print, although I've seen copies for sale from
Marston Exotics (if you're willing to make the $200 order minimum).
Jan's list is available by sending $20 US to his address:
Jan Schlauer
Zwischenstr. 11
6000 Frankfurt/Main 70
Germany
It's about 90 pages long and very good.
BAMR
P.S. My U. monanthos flowered and keyed out easily to be correctly ID'd.
Pretty little flower, similar to U. dichotoma but smaller in all respects.
Only single-flowered, too.