Most Aethionema are pink, but I obtained this white one years ago from one of the Czech collectors and I believe it is A. iberideum from Turkey. Alas, it does not produce seed and if I don't propagate it soon from cuttings we may lose it.
I believe this is the true A. schistosum: over the years I have received a half dozen very different plants under this name. This one is a good pink, and almost as compact as the last species. I recommend it wholeheartedly for the small rock garden or trough!
In my experience, Aethionema subulatum has the darkest pink flowers of the genus (so far). It isn't the smallest species, but does not get as large or seed as much as A. grandiflorum. I am surprised this very lovely plant has not gained currency.
As you can see, I like it enough to grow lots of it in my rock garden (which is not infinite in space...)
One last glimpse of it: there was a time when pinks and pale blues--all the pastels--were the rage and the norm. At this time, the brasher "jewel-tone" reds, oranges and bright purples have elbowed these gentler pinks out of fashion. Those of us who dwell with the eternal verities don't pay attention to such nonsense: I love all colors including baby pink and rich rose! So what if they aren't "manly" and overstated! Everyone should cultivate their sensitive side (sniff sniff).
There are really dozens more Aethionema (I've grown far more than these--but hesitate to try your patience). They are much of a pinkness, after all...but if I were to be told to grow only one, I think I might pick Aethionema capitatum, pictured above in my rock garden. This was grown from seed of the plant below--check it out!
I took this picture five or ten years ago in Bill Adams wonderful rock garden in Pueblo. This same plant today is a gnarly bonsai (with a trunk bigger than your thumb, and an almost tree-like form and shape--less than a foot tall and not much broader. It blooms for a month or more at the height of spring and in early summer. The seedpods are appealing, and the foliage beautiful blue the year around. Like all aethionemas, it is very drought tolerant. I grow some with no supplemental irrigation. This one stands out!
It is strange indeed that such charming plants that provide so much beauty with so little fuss are still strangers to so many gardens...how do we change that?