A known site for this but still a thrilling day to find this globally rare and declining subspecies in flower. Vegetatively it looks nearly exactly like two other co-occuring species. I've been planning this survey for a few years and finally the time was right. I saw this in a bordering state but close to Massachusetts where I believe this could be found with a serious search effort in the Berkshires. We have some of the same habitat. This is the first New England iNat observation of this species or subspecies.
The flower has only sepals with the petals thought to be modified into the bright yellow staminodes visible in the close-up view.