I'd never heard of this plant until today. Here's a link to what has been an academic article (Mayagoitia 1986), but has lost its references - which is a pity because it appears to be essentially a review of the literature.
There's another reference to the plant here, (Rodrigues, 2006).
And of course you get some real down-and-dirty information at good old Erowid.
Sounds intriguing, anyhow, and we need some houseplants. I'm involved in a long running low-level battle with Herself to get rid of these fuck-awful vertical blinds we've got: they look like they belong in an office AND they take up the whole depth of the windowsill when they're open, so no room for houseplants. I like old fashioned nets. Why can't we have old fashioned nets?
Eliana Rodrigues; E A Carlini 2006 Plants with possible psychoactive effects used by the Krahô Indians, Brazil Rev. Bras. Psiquiatr. vol.28 no.4
Mayagoitia L, Dias JL, Contreras CM. 1986 Psychopharmacologic analysis of an alleged oneirogenic plant: Calea zacatechichi. J Ethnopharmacol. 1986;18(3):229-43