Process & Plant Automation Ltd (@ppaghltd) Mentions Facebook Framed Print of Strychnine tree or poison nut, Strychnos nux vomica Print. Framed Print from Mary Evans Process Plants Explained: Types, Uses, and How IPP Can Help The prickly water lily (Euryale ferox) produces seeds called makhana (fox nuts), which are harvested from its spiny aquatic plant and widely enjoyed as a nutritious, protein rich snack. Rare and Endangered Plants Presidio of San Francisco (U.S. National Park Service)