Michauxia campanuloides

It's the name of a very rare short-lived perennial plant that I added to the garden late last May.  The shape of the flowers in the few photos I'd seen really intrigued me.  The plants just sat there all summer, neither getting larger nor flowering but this spring I saw that three of the 5 had survived and were putting up flower spikes.  They bloomed about a week ago and the flowers are indeed fascinating, if smaller than expected.  Here are three sketches I did of them: