Plants by Frans Vermeulen and Linda Johnston
A four-volume, 4,968-page materia medica organising more than 2,000 plant remedies by botanical family, classified with the modern APG III DNA-based system.

Family-based materia medica
Each of the 149 botanical families is introduced as a coherent grouping, with shared themes, organ affinities and sensations that tie the individual remedies together rather than treating them in isolation.
Built on APG III classification
Plants follows the APG III system, where families are defined by DNA sequencing rather than morphology. Nomenclature is updated throughout (for example Belladonna listed as Atropa belladonna) and families such as Scrophulariaceae are redistributed accordingly.
Over 2,000 plant remedies
The set discusses 2,027 plant remedies drawn from materia medicas, repertories and pharmacopoeias. For each remedy you find the number of rubrics in modern repertories, phytochemistry, official and common names, botanical description and distribution.
Multiple sources woven together
Vermeulen and Johnston work as 'correctors, collectors and connectors', combining provings, clinical observations, herbal uses, folklore, mythology, botany, toxicology and phytochemistry into a single coherent picture for each family and remedy.
What's included
About the author
Frans Vermeulen
Frans Vermeulen, born in 1948 in the Netherlands, trained as a homeopath in The Hague and opened his practice in 1979 before becoming head of the Dutch school of homeopathy in 1990. He is the author of Synoptic Materia Medica I and II, Concordant Materia Medica, Prisma Materia Medica and the Spectrum series on Monera and Fungi. Plants (2011) was co-authored with his wife Dr. Linda Johnston, MD, DHt, and is widely regarded as a definitive botanical-family materia medica.
In collaboration with Saltire Books
Study remedies by botanical family
Add Vermeulen and Johnston's Plants to Similia and work with over 2,000 plant remedies organised by their modern botanical families.