Lespedamine is an indole alkaloid and substituted tryptamine present in the plant Lespedeza bicolor. The alkaloid bears a close structural resemblance to the psychedelic alkaloid dimethyltryptamine and was speculated to have psychoactivity by Alexander Shulgin. No reports on lespedamine's biological activity have been published. Lespedamine is an indole alkaloid and substituted tryptamine present in the plant Lespedeza bicolor. The alkaloid bears a close structural resemblance to the psychedelic alkaloid dimethyltryptamine and was speculated to have psychoactivity by Alexander Shulgin. No reports on lespedamine's biological activity have been published.