Latin: Cypripedium pubescens

 It is a “meningeal vaso-relaxant” (Menzies-Trull in "The Herbalist's Prescriber")

“Lady’s Slipper is one of the most widely applicable nervines that we possess in the materia medica. It may be used in all stress reactions, emotional tension and anxiety states. It will help elevate the mood, especially where depression is present … It is perhaps at its best when treating anxiety that is associated with insomnia.” (David Hoffman in “The New Holistic Herbal”).