very interesting, I didn't know about those experience reports on erowid where coleus was also found to catalyse other worldly dreams. my experience was with a majority green coleus with red colouration in the centre of the leaves, combined with caapi. I no longer have that coleus plant unfortunately.
Christian Rätsch's book Encyclopaedia of Pyschoactive Plants has some interesting info in the entry for coleus blumei. Here is a summary:
originally from SE asia, brought to south america post-conquest psychoactive use amongst the Mazatecs was discovered in 1962 in connection with Gordon Wasson's research into salvia divinorum [1] Mazatecs consider coleus to be in the same "family" as salvia, and has been reported to be used as a substitute for salvia (no reference given) however Daniel Seibert reported that he only ever met one person in the area of the Mazatecs who maintained that coleus was psychoactive [2] is used medicinally in Samoa, SE Asia and PNG to treat various maladies including digestive issues and headaches [1,3,4] Rosmarinic acid has been biosynthesised in cell cultures of coleus blumei [5,6] a diterpene (forskolin = coleonol) that is potently bioactive has been found in coleus forskohlii [4,7] salvinorin-like substances have been isolated from coleus blumei (no reference)
1. Ott 1993
2. Schuldes 1995
3. Uhe 1974
4. Valdes et al 1987
5. Häusler 1992
6. Meinhard 1993
7. D McKenna 1995
So it would appear that there are definitely some bio active compounds in some coleus plants, however its use as an effective shamanic intoxicant is inconclusive.