Triadenum fraseri

(Spach) Gleason

Phytologia 2: 289. 1947

Common names: Millepertuis de Fraser
EndemicSelected by author to be illustrated
Basionyms: Elodes fraseri Spach Ann. Sci. Nat., Bot., s é r. 2, 5: 168. 1836 (as Elodea)
Synonyms: Hypericum virginicum var. fraseri (Spach) Fernald Triadenum virginicum subsp. fraseri (Spach) J. M. Gillett T. virginicum var. fraseri (Spach) Cooperrider
Treatment appears in FNA Volume 6. Treatment on page 103.
Herbs erect, 1.5–7.5 dm, sometimes with ascending branches in distal 1/2+. Stems shallowly 4-lined at first, then terete. Leaves sessile, sometimes amplexicaul; blade broadly ovate or triangular-ovate to oblong, 15–50(–70) × 10–40(–50) mm, base usually ± shallowly cordate, rarely truncate, apex rounded to retuse, gland dots laminar (relatively dense) and intramarginal.

Phenology: Flowering late summer–early fall (Jul–Sep).
Habitat: Wooded swamps, fens, marshes, lakeshores, organic to silty and sandy substrates, along shores, beaver meadows, poor fens (rarely in true bogs)
Elevation: 0–500 m


V6 183-distribution-map.jpg

St. Pierre and Miquelon, B.C., Man., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Sask., Conn., Del., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., Mont., Nebr., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.


According to B. Boivin (1967), Triadenum fraseri (as Hypericum virginicum) was introduced into British Columbia from eastern Canada in peat. It seems to be almost always distinguishable from T. virginicum and to have a distinct habitat; it merits specific rank.



Lower Taxa

No lower taxa listed.

Facts about "Triadenum fraseri"
AuthorNorman K. B. Robson +
Authority(Spach) Gleason +
BasionymsElodes fraseri +
Common nameMillepertuis de Fraser +
DistributionSt. Pierre and Miquelon +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Conn. +, Del. +, Ill. +, Ind. +, Iowa +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, W.Va. + and Wis. +
Elevation0–500 m +
HabitatWooded swamps, fens, marshes, lakeshores, organic to silty and sandy substrates, along shores, beaver meadows, poor fens (rarely in true bogs) +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering late summer–early fall (Jul–Sep). +
Publication titlePhytologia +
Publication year1947 +
ReferenceNone +
Source xml grained fna xml/V6/V6 183.xml +
Special statusEndemic + and Selected by author to be illustrated +
SynonymsHypericum virginicum var. fraseri +, Triadenum virginicum subsp. fraseri + and T. virginicum var. fraseri +
Taxon familyHypericaceae +
Taxon nameTriadenum fraseri +
Taxon parentTriadenum +
Taxon rankspecies +
VolumeVolume 6 +