- Botanical.com: Nux Vomica
- Contains data on the distinguinshing characteristics. Includes medicinal uses, habitat and photos.
- Florabase: Strychnos
- Provides information on the profile of the plant. Includes characteristics, reproduction, fruits, seed features, distribution and photos.
- National Tropicala Botnical Garden: Strychnos sp.
- Presents information on the medicla uses, hazardous contents, research, taxonomy and indigenous practices. Includes taxonomy and distribution.
- Purdue University: Nirmali (Strychnos potatorum Linn.)
- Contains general description on the plant. Includes medicinal uses and useful parts.
- Sigrid Leger: Strychnos pungens Soler
- Provides information on the distinguishing features of the specie. Includes medical uses and photos.
- Strychnos spinosa Lam
- Provides information on the distinguishing charcteristics of the group. Includes history, ecology, uses, culture and photos.
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