Fruit of Datura stramonium L. Family - Solanaceae. Flowering - May - October. Habitat - Pastures, barnyards, fields, waste ground, cultivated areas, roadsides, railroads. Type - Annual, poisonous. This toxic species can be found scattered throughout most of Missouri. It is easily identified by its glabrous, purple stems, toothed leaves, and spiked fruits. Datura stramonium is packed with tropane alkaloids. These alkaloids are autonomic nervous system blocking agents. Apparently, the level of alkaloids in individual plants varies from day to day depending on environmental conditions and stages of plant development. This can lead to problems for people who use the plant as a narcotic as higher levels of these alkaloids can cause death. Maharashtra, India.