Here's another look at purple prairie, this with a head that's a little longer. Prairie clover had a variety of medical uses among Indians, and it turns out that it really works. Chemicals in it are useful to combat the effects of opiods. The chemical language is itself fascinating. These contain pawhuskin A, B, and C, and petalostemumol. An old generic name for these plants was Petalostemum. These chemicals, particularly pawhuskin A, inhibit our reaction to opiods.