My husband spotted something unusual coming up out of our crossvine, inverted pitcher-like purple flowers that were very different than the crossvine’s peachy-orange vessel flowers. The iNaturalist app gave us the category “clematis and leather flowers”. Searching leatherflowers, the purple leather flower, Clematis pitcheri, was a visual match. We certainly didn’t plant it, but it is quite welcome!

For those curious, the flower is quite robust, and the curling tips feel very much like leather (as a leather worker, I feel confident in that assessment.) I did not dissect a bloom, but if it continues to do well and produces more than just three flowers, that will be a future project.