I always thought it was called that because it was used by native Americans to make 'black drink' which they consumed ceremonially, tending to vomit afterwards.

I always thought it was called that because it was used by native Americans to make 'black drink' which they consumed ceremonially, tending to vomit afterwards. https://en.wikipedia.org/wiki/Yaupon_tea https://en.wikipedia.org/wiki/Yaupon_tea