Salvia Divinorum is the psychoactive species.
I learned this after pulling seeing
these (crappy cell phone photo) planted along Fairview blvd. next to a park and pulling over to grab a
clipping to identify it. Turns out it's salvia! But it appears to be
Salvia leucantha, not divinorum, so no worries if and when I plant this in the back. The flowers are fuzzy!
ETA: I don't know if leucantha has been tested for psychoactive effects or not. I did find a study that showed that a 3rd species (
splendens, generally with scarlet red flowers) produced "effects" consistent with a placebo. So it seems that divinorum is THE species of interest. I still don't know what availability is.