Completely certain. My friend Gerry Steinauer, the state botanist for Nebraska, originally confirmed the ID for me. It's a fairly common plant in dry upland woods in southeast Nebraska. As you move eastwards across the across the continent (and get higher rainfall levels), it is more likely to occur in open habitats but is still mostly an upland plant.
The other Eutrochiums are primarily wetland plants and, although they can be grown under mesic conditions, they don't tolerate dryness well at all.