Dictamnus albus var. I spotted it almost immediately after arriving at Gingerbread Farm Perennials in Wayne, Maine, owned by Anna and Charlie Cushman. This particular specimen was D. albus var. Individual blossoms are borne on 3-foot spikes. Once flowers are spent, attractive seedpods are produced that can be dried and used in cut flower arrangements.
Leaves are pinnate, dark green and somewhat leathery.
Pyrotechnic plant D. albus is commonly known as gas plant and burning bush for an unusual trait. Flowers emit a gas that can be ignited during calm late evenings, producing brief blue flames that do no damage to the flowers. Anna said she's never tried this trick, but I've spoken to others since who swear it really works. But gas plant isn't without its problems. It's a terribly slow grower and difficult to propagate.