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bog St. John's wort, Fraser's marsh-St. John's-wort, Fraser's St. John's-wort, marsh St. John's-wort, millepertuis de Fraser

Habit 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.

Triadenum fraseri

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 (0–1600 ft)
Distribution
from FNA
CT; DE; IA; IL; IN; MA; MD; ME; MI; MN; MT; NC; NE; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WI; WV; BC; MB; NB; NL; NS; ON; PE; QC; SK; SPM
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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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 6, p. 103.
Parent taxa Hypericaceae > Triadenum
Sibling taxa
T. tubulosum, T. virginicum, T. walteri
Synonyms Elodes fraseri, Hypericum virginicum var. fraseri, T. virginicum subsp. fraseri, T. virginicum var. fraseri
Name authority (Spach) Gleason: Phytologia 2: 289. (1947)
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