Sources:
1. Snowdrop
https://www.drugs.com/mtm/galantamine.html
https://www.ncbi.nlm.nih.gov/books/NBK574546/
2. Crocus
https://www.drugs.com/mtm/colchicine.html
https://www.ncbi.nlm.nih.gov/books/NBK431102/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7120738/
3. Spurge
https://www.drugs.com/cdi/ingenol-mebutate.html
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5313035/
4. Plum yew
https://www.drugs.com/mtm/omacetaxine.html
https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-...
https://www.ncbi.nlm.nih.gov/books/NBK531459/
5. Chili
https://www.drugs.com/mtm/capsaicin-topical.html
https://www.ncbi.nlm.nih.gov/books/NBK459168/