We have no mountains here, so this is perhaps a strange thing to find here, but it's native and it's happy, mountains or not. The plants have square stems as mints do and they get about 3 feet tall here. We see it every year along the roadsides, but t's all over the place this year, so clearly it likes the cooler, wetter weather. Even in all our clay. 
The Latin is Pycnanthemum incanum. 'Pycnanthemum' means 'dense flower cluster' in Greek. Now you know.