Last year at a NARGS New England Chapter seedling sale, I bought a plant labeled as Zigadenus elwesii. Researching the name, it doesn't appear there is such a combination as Zigadenus "elwesii", so I'm left wondering which Zig species I actually have. The Flora of North America has 14 species, but since the genus includes species from Mexico & Central America, as well as in Japan, China, Siberia and Mongolia, I'm not sure I'll be able to arrive at an ID.
It is about 16" tall, the panicle is branched at the base, and the waxy green and whitish flowers with shiny conspicuous glands, are surprisingly showy, most definitely intriguing. The flowers do not smell good, only noticeable at close hand.
Using Google images, my plant looks similar to Zigadenus glaucus (Z. elegans ssp. glaucus)
Zigadenus in Flora of North America