Triadenum fraseri
Triadenum virginicum
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
marsh St. John's wort, millepertuis de virginie, Virginia marsh-St. John's-wort
shallowly 4-lined at first, then terete.
internodes 4-lined or 4-angled at first, then terete.
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.
sessile, sometimes amplexicaul;
blade usually ovate or triangular-ovate to elliptic or oblong, rarely oblanceolate, 20–65 × 10–22(–30) mm, base shallowly cordate, apex usually rounded, rarely obtuse to retuse, gland dots laminar (relatively dense, large) and intramarginal (relatively small).
laxly cylindric to pyramidal, 3–15-flowered from terminal node, sometimes with subsidiary inflorescences from to 4 proximal nodes and flowering branches from to 6 further nodes.
10–15 mm diam.;
sepals oblong to elliptic-oblong or oblong-lanceolate, 4–7(–8) × 1–2 mm, apex acute to acuminate;
petals oblong-elliptic to oblanceolate, 6–9(–10) mm;
stamen fascicles 4–6.5 mm;
filaments 1/5 connate;
styles 2–3.5 mm.
cylindric to ellipsoid or ovoid-ellipsoid, (8–)9–10(–12) × 4–5 mm, apex acute.
0.5–1.2 mm.
= 38.
Triadenum fraseri
Triadenum virginicum
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.)
Triadenum virginicum is the most widely distributed North American species of Triadenum. In the southwestern part of its range, the leaves are longer and narrower, approaching those of T. tubulosum and T. walteri; it is nearly always distinguishable from the northern T. fraseri by the sepals and styles (see key).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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