Triadenum fraseri

(Spach) Gleason
Phytologia 2: 289. 1947.
Common names: Millepertuis de Fraser
EndemicIllustrated
Basionym: 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

Distribution

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.

Discussion

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.

Selected References

None.

Lower Taxa

None.

... more about "Triadenum fraseri"
Norman K. B. Robson +
(Spach) Gleason +
Elodes fraseri +
Millepertuis de Fraser +
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. +  and Wis. +
0–500 m +
Wooded swamps, fens, marshes, lakeshores, organic to silty and sandy substrates, along shores, beaver meadows, poor fens (rarely in true bogs) +
Flowering late summer–early fall (Jul–Sep). +
Endemic +  and Illustrated +
Hypericum virginicum var. fraseri +, Triadenum virginicum subsp. fraseri +  and T. virginicum var. fraseri +
Triadenum fraseri +
Triadenum +
species +