Triadenum virginicum |
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marsh St. John's wort, millepertuis de virginie, Virginia marsh-St. John's-wort |
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Habit | Herbs erect, 2–7 dm, sometimes with ascending branches distally. |
Stems | internodes 4-lined or 4-angled at first, then terete. |
Leaves | 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). |
Inflorescences | 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. |
Flowers | 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. |
Capsules | cylindric to ellipsoid or ovoid-ellipsoid, (8–)9–10(–12) × 4–5 mm, apex acute. |
Seeds | 0.5–1.2 mm. |
2n | = 38. |
Triadenum virginicum |
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Phenology | Flowering summer–fall (Jul–Oct). |
Habitat | Swamps, marshy shores, poor fens |
Elevation | 0–500 m (0–1600 ft) |
Distribution |
AL; AR; CT; DC; DE; FL; GA; IL; IN; KY; LA; MA; MD; ME; MI; MS; NC; NH; NJ; NY; OH; PA; RI; SC; TN; TX; VA; VT; WI; WV; NS; ON
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Discussion | 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.) |
Source | FNA vol. 6, p. 103. |
Parent taxa | Hypericaceae > Triadenum |
Sibling taxa | |
Synonyms | Hypericum virginicum, Elodes campanulata, E. campanulata var. emarginata, E. virginica, Gardenia virginica, Hypericum campanulatum, H. enneandrum, Martia campanulata |
Name authority | (Linnaeus) Rafinesque: Fl. Tellur. 3: 79. (1837) |
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