• One of several inedible wild Mexican yams (Dioscorea mexicana and Dioscorea composita) from which progesterone can be synthesized.
  • An evergreen (Jacquinia barbasco, now Jacquinia arborea)
  • A plant (Lonchocarpus urucu, now Deguelia rufescens var. urucu) native to parts of northern South America used as a poison for fishing and an insecticide.

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