That's Henbane, isn't it? We had lots in SW Montana.We generally chopped it down, didn't try pulling it.
Didn't they use it for medicinal purposes in the war?
I looked up how to spell it and this is what else I found:
---Cultivation---Henbane is in such demand for medicinal purposes that it is necessary to cultivate it, the wild plants not yielding a sufficient supply.
The leaves of Henbane do cool all hot inflammations in the eyes.... It also assuages the pain of the gout, the sciatica, and other pains in the joints which arise from a hot cause. And applied with vinegar to the forehead and temples, helps the headache and want of sleep in hot fevers.... The oil of the seed is helpful for deafness, noise and worms in the ears, being dropped therein; the juice of the herb or root doth the same. The decoction of the herb or seed, or both, kills lice in man or beast. The fume of the dried herb stalks and seeds, burned, quickly heals swellings, chilblains or kibes in the hands or feet, by holding them in the fume thereof. The remedy to help those that have taken Henbane is to drink goat's milk, honeyed water, or pine kernels, with sweet wine; or, in the absence of these, Fennel seed, Nettle seed, the seed of Cresses, Mustard or Radish; as also Onions or Garlic taken in wine, do all help to free them from danger and restore them to their due temper again. Take notice, that this herb must never be taken inwardly; outwardly, an oil, ointment, or plaister of it is most admirable for the gout . . . to stop the toothache, applied to the aching side....'
http://www.botanical.com/botanical/mgmh/h/henban23.html