post an unknown plant and see if others can provide a name

Which is the real Achillea holosericea?

I grew seeds of Achillea holosericea this year, and ended up with two different plants. Most of the seedlings look like the plant on the left, which I suspect is not Achillea holosericea, judging from the few photos I can find, including the one in the article by Grahame Ware in the spring 2012 Rock Garden Quarterly. (It does look very interesting though!) Can anyone please comment or suggest what the one on the left might be (if it not Achillea holosericea)? Thanks.

Which brassicaceae?

A couple years ago I got seed through the exchange for "Petrocallis pyrenaica". One seedling survived, bloomed a bit last year, and is blooming again on a slightly more robust plant now. It's clearly not petrocallis - probably some kind of alyssum, aurinia, or something in that botanical corner. Any ideas? My page about the plant is up here: http://www.robsplants.com/plants/PetroPyre2 and I'd love to get the identification correct.
Thanks in advance for any suggestions!

Not sure what this Heuchera is, any ideas?

Many years ago i came across this plant while exploring a remote area of limestone outcrops in central Idaho. It seems the population was only on cliffs in a rather small area and was a bit of a hectic climb just to have a look(i could not repeat that today, i'm afraid). I am not really sure what it is as i have not been able to key it out in a satisfactory way and have never been skilled with keys anyway.

Unknown fern

I know next to nothing about ferns, and my efforts at trying to identify this one have come to naught! These photos were taken quite high in the alpine zone in northern Banff (~2600m elevation). It looks like it should be distinctive enough that someone may recognize the genus on sight. It's growing in crevices among quartzite boulders. Any help to ID it would be appreciated.

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