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| Triadenum fraseri (Spach) Gleason | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||
| Family: | Clusiaceae | ||||||||
| Genus: | Triadenum | ||||||||
| Species Synonyms: | Elodea fraseri Spach Hypericum virginicum var. fraseri (Spach) Fern. Triadenum virginicum var. fraseri (Spach) Cooperrider Triadenum virginicum ssp. fraseri (Spach) J. Gillett |
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| Common Names: | marsh St. Johnswort Fraser’s marsh St. Johnswort |
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| DISTRIBUTION | |||||||||
| Canada: | east-central Saskatchewan – Manitoba – Southern Ontario – southern Labrador – Newfoundland – Nova Scotia | ||||||||
| Saskatchewan: | east-central Saskatchewan | ||||||||
| Ecoregion: | Mid-Boreal Lowland | ||||||||
| HABITAT | |||||||||
| Saskatchewan: | in up to 2 feet of water in semi-aquatic environments, floating marshy sedge fens, open quaking bogs, or Phragmites islands | ||||||||
| Associated Species: | Caltha palustris, Phragmites australis | ||||||||
| RARITY STATUS | |||||||||
| Provincial
Status According to Harms (2003): |
Endangered |
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| Nature Conservancy Status: | G4G5 S1 |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Triadenum fraseri is endangered in Saskatchewan because it is extremely rare and highly regionally restricted. This species is almost always locally sparse. | |||||||||
| SPECIES DESCRIPTION | |||||||||
| Height: | 30 – 60 cm | ||||||||
| Roots: | fibrous roots thick, yellowish-orange to brownish; rhizome creeping | ||||||||
| Leaves: | opposite, sessile to clasping, 3 – 6 cm long, 2 – 3 cm wide, orbicular to ovate to oblong, base rounded, apex rounded to obtuse, glabrous, abaxial surface black punctate, slightly glaucous | ||||||||
| Inflorescence: | flowers axillary or terminal, pedicelled | ||||||||
| Flowers: | 1 – 2 cm wide; calyx 5-merous, to 5 mm long, ovate-lanceolate, apex acute; corolla 5, 5 – 10 mm long, imbricated in bud, exceeding sepals, pinkish to greenish to purplish; stamens 9, united into 3 fascicles, opposite orange glands; styles 3, < 1.5 mm long, free | ||||||||
| Fruits: | capsule to 12 mm long, ovoid to oblong | ||||||||
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