Triadenum

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]
Gardenia Colden Hypericum L. sect. Elodea Choisy

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.

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]

1. ^ ^{a b c} "Triadenum in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2021-12-15.
2. ^ NRCS. "Triadenum". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 14 December 2015.
3. ^ "Triadenum Raf". Plants of the World Online.
4. ^ "Triadenum". VASCAN. Retrieved 17 June 2022.
5. ^ ^{a b} "Triadenum in Flora of China @ efloras.org". www.efloras.org.
6. ^ Robson, N. K. (2021). "Studies in the genus Hypericum L.(Hypericaceae) 9. Addenda, corrigenda, keys, lists and general discussion". Phytotaxa. 72: 1–111. doi:10.11646/phytotaxa.72.1.1.
7. ^ Robson, Norman K.B. (11 April 2016). "And then came molecular phylogenetics—Reactions to a monographic study of Hypericum (Hypericaceae)". Phytotaxa. 255 (3): 181. doi:10.11646/phytotaxa.255.3.1.

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