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Arthur your unknown Saxifraga (#10) is Saxifraga candelabra!
Yes, Gerd, I have seen it in the wild, so it's in poor soil and full sun...in fact, in very little soil at all...the largest patch is on top of one of the big pieces of limestone in my rock garden, where nothing else will grow (just a few cm of soil on the top of the rock.) The second little drift is wedged in a wide crevice. The location is about 90cm? high and exposed-- no shelter from rain or anything else---and there is barely a day it has not rained since winter. Some of the foliage is looked very chlorotic right now (yellow), and it does have me worried, especially since they are blooming almost too well. I only got one single seed pod this spring from many plants (and good bloom). Perhaps I will get more now...?
. Gerd, take a look at the Viola pedata faces on this page, if you have not seen it before. http://www.plantbuzz.com/RockGard/pedata/pedata_faces.htm