The toxicity of sixteen plants was investigated. According to
the available literature the following three plants were proved for
the first time to be toxic: Senecio pterophorus DC; Kalanchoe
paniculata Harv., Kalanchoe thyrsiflorae Harv.
The results obtained in the experiments with Crotalaria rhodesiae Baker f. and Pseudogaltonia clavata (Baker) Phillips are
not considered sufficiently conclusive to prove these two plants to be
The latex of Arauya serisifera Brot. was proved to possess
irritant properties when applied to the skin.
The Senecio alkaloids, isatidine and retrorsine, administered
per os to horses induced symptoms, post-mortem appearances, and
histological lesions typical of those of "dunsiekte" in horses, and
these alkaloids are undoubtedly the active principles of the species
of Senecio from which they were isolated.
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