St. John's Wort | Knowledgebase | Johnson's Nursery
Hypericum - FNA
List of Hypericum species - Wikiwand
Hypericum perforatum (Common St. John's Wort) - World of Flowering Plants
Hypericum perryongii (Hypericaceae), a new species from Philippines
Hypericum - Wikispecies
Hypericum - FNA
Frontiers | Does phenotyping of Hypericum secondary metabolism reveal a tolerance to biotic/abiotic stressors?
Hypericum online | A site dedicated to Hypericum – The St John's Worts
Hypericum perforatum L. | Colombian Plants made accessible
Hypericum perforatum subsp. perforatum
Roundfruit St. John's-Wort (Hypericum sphaerocarpum) · iNaturalist
Hypericum perforatum L. | Plants of the World Online | Kew Science
Plants | Free Full-Text | Mixed-Ploidy and Dysploidy in Hypericum perforatum: A Karyomorphological and Genome Size Study
v.32:no.2 (2002:Nov.) - Bulletin of the Natural History Museum. Botany series - Biodiversity Heritage Library
St. Andrew's Cross (Hypericum hypericoides) · iNaturalist
Hypericum perforatum (St John's wort) | CABI Compendium
PDF) St. John's Wort Hypericum perforatum Laboratory Guidance Document
Hypericum perforatum (St John's wort) | CABI Compendium
Hypericum × desetangsii Lamotte | Plants of the World Online | Kew Science
