Triadenum, known as marsh St. John's worts,[2] is a small genus of flowering plants in the family Hypericaceae. The genus is characterized by opposite, blunt-tipped leaves and pink flowers with 9 stamens. They are distributed in North America and eastern Asia.
| Triadenum | |
|---|---|
 | |
| Triadenum virginicum | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Malpighiales |
| Family: | Hypericaceae |
| Tribe: | Cratoxyleae |
| Genus: | Triadenum Raf. |
| Type species | |
| T. fraseri (Spach) Gleason | |
| Synonyms[1] | |
| |
Acceptance of this genus is varied. Kew's Plants of the World Online[3] and the Database of Vascular Plants of Canada (VASCAN)[4] treat it as a junior synonym of Hypericum and the Flora of North America[1] and Flora of China[5] treat it as separate. The situation arises from B. R. Ruhfel et al. (2011)'s genetic study describing Triadenum as subsumed under Hypericum and later genetic results disagreeing with this assessment.[6] Under Hypericum, the species are mostly treated as the section Hypericum sect. Elodea.[7]
Species
Triadenum contains the following 6 species according to Flora of North America and Flora of China:[1][5]
- Triadenum breviflorum (Wall.)
- Triadenum fraseri (Spach) Gleason
- Triadenum japonicum (Thunb.)
- Triadenum tubulosum (Walter) Gleason
- Triadenum virginicum (L.) Raf.
- Triadenum walteri (J.F.Gmel.) Gleason
References
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