Triadenum
{{Short description|Genus of plants}}
{{Automatic taxobox
|image=Triadenum virginicum.jpg
|image_caption=Triadenum virginicum
|taxon=Triadenum
|authority=Raf.
|type_species=T. fraseri
|type_species_authority=(Spach) Gleason
|synonyms_ref={{r|fna}}
|synonyms=*Gardenia {{small|Colden}}
- Hypericum {{small|L.}} sect. Elodea {{small|Choisy}}
}}
Triadenum, known as marsh St. John's worts,{{r|usda}} 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.
Acceptance of this genus is varied. Kew's Plants of the World Online{{r|powo}} and the Database of Vascular Plants of Canada (VASCAN){{r|vascan}} treat it as a junior synonym of Hypericum and the Flora of North America{{r|fna}} and Flora of China{{r|foc}} 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.{{r|robson2021}} Under Hypericum, the species are mostly treated as the section Hypericum sect. Elodea.{{r|robson2016}}
Species
Triadenum contains the following 6 species according to Flora of North America and Flora of China:{{r|fna|foc}}
- Triadenum breviflorum (Wall.)
- Triadenum fraseri {{small|(Spach) Gleason}}
- Triadenum japonicum (Thunb.)
- Triadenum tubulosum {{small|(Walter) Gleason}}
- Triadenum virginicum {{small|(L.) Raf.}}
- Triadenum walteri {{small|(J.F.Gmel.) Gleason}}
References
{{Reflist|refs=
{{PLANTS|id=TRIAD|taxon=Triadenum|access-date=14 December 2015}}
}}
{{Triadenum species Navbox}}
{{Taxonbar|from=Q3309175}}
{{Authority control}}
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