two plants are commonly called 'wood betony' leading to some confusion, what is the latin name of the plant you are referring to?

both of the herbs with this common name have an affinity for the head, often used for headaches, anxiety, etc.

It's in the link: Wood Betony (Pedicularis canadensis L.).

"Pedicularis (Orobanchaceae, formerly Scrophulariaceae: Rhinanthoideae) are hemiparastic plants. Pedicularis canadensis ... whose common names are lousewort or wood betony, is an obligate root parasite on a wide range of host species, but it retains its photosynthetic ability. Reproduction and host foraging are accomplished both sexually (seeds) and asexually (rhizomes). "

Here is a link that might be useful: Illinois State

ooo, Pedicularis is one of my favorite herbs! it's a wild snapdragon family member and looks like it too. have harvested it many times in the high rockies where it likes to grow and blooms in summer, july and august. (although there are lowland versions of it too) it possesses lovely nervine and sedative properties...highly prized by the working herbalist. it can be hard to come by in commerce, always sells out quickly. please harvest ethically... 10% only from large stands.