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Senecio spp.
There are some 1200 different species of Senecio that are distributed throughout the world, with about 70 species occurring in North America. Approximately 25 of these are known to be poisonous, but all species of Senecio should be considered toxic unless known otherwise. The Senecio species have a wide overlapping geographical range in which they grow, but are selective in their habitats, some preferring high altitude, subalpine, moist conditions, while others prefer dry, rocky, sandy soils at lower elevations.