This species is known to occur at this location. I think this plant is it: a shrub about 2 ft high with small lightly toothed leaves and dark marks on the capsule. Growing on gypsum talus. I keyed it with the Flora of New Brunswick. Would appreciate comments.
See my blog (http://ninafinley176.blogspot.com/2018/04/carrion-flowers-and-hammerhead.html) for a photo of the inflorescence.