Thanks to a garden post by September Violets, a mystery is solved:
The sole survivor of the Snowplow Incident of 2013 is Chelone obliqua,
a very hardy and tolerant (but we knew that!) native wildflower.
There is apparently a white form as well, Chelone glabra,
which I would love to see!
Do you have it in your garden?
Perhaps we could trade!
~~~~~