This plant is used as a wild edible flavoring herb or maybe even grown or naturalised in gardens here in Ladakh. It has a lemony smell, not as strong and sweet as some herbs. It's definitely mint family, with square stems and opposite leaves. When small, the leaves are shaped like lemon balm (Melissa) but the leaves are smooth whereas Melissa is fuzzy, and anyway as it gets bigger the leaves elongate. The leaves are smooth like, say, spinach, but as it forms flower buds, the upper leaves or bits around the buds get long hairs. The flowers are white.
I cooked some up like spinach with onion and it was very nice.
I'd love to know its ID!
Works at a residential alternative high school in the Himalayas SECMOL.org . "Back home" is Cape Cod, E Coast USA.