E-Flora BC: Electronic Atlas of the Flora of British Columbia

Triadenum fraseri (Spach) Gleason
Fraser's St. John's-wort (Fraser's marsh St. Johnswort)
Hypericaceae (Mangosteen family)
(Previously in Clusiaceae)

Introduction to Vascular Plants

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Distribution of Triadenum fraseri
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Species Information

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Illustration Source: The Illustrated Flora of British Columbia

General:
Perennial herb from a taproot; stems erect, few branched, glabrous, 30-60 cm tall.

Leaves:
Stem leaves oblong to oblong egg-shaped, unstalked, heart-shaped at the base with rounded or notched tips, 3-6 cm long, 2-3 cm wide, glabrous with translucent glands below.

Flowers:
Inflorescence up to 5- to 50-flowered; petals purplish or flesh-coloured, 5-8 mm long; sepals elliptic or oblong, obtuse, 3-5 mm long; stamens in 3 groups of 3 alternating with 3 large, orange glands.

Fruits:
Membranous capsules, 7-12 mm long; seeds dark purplish, about 1 mm long, finely corrugated and pimply in lines.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet bogs, marshes and shorelines in the lowland zone; rare in SW BC, known only from the lower Fraser Valley; introduced from E North America.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Status Information

Origin Status	Provincial Status	BC List (Red Blue List)	COSEWIC
Exotic	SNA	Exotic	Not Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer, the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Elodea fraseri Spach.
Hypericum virginicum var. fraseri (Spach) Fern.
Triadenum virginicum subsp. fraseri (Spach) J. Gillett
Triadenum virginicum var. fraseri (Spach) Cooperrider

Taxonomic and Nomenclatural Links

Genetic information (NCBI Taxonomy Database)
International Plant Names Index
Taxonomic Information from the World Flora Online
Integrated Taxonomic Information System

Additional Range and Status Information Links

Burke Museum of Natural History (Washington State records)
CalFlora
Consortium of Pacific Northwest Herbaria records
Jepson Interchange
NatureServe Explorer
USDA

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
Google Image Search
Flickr Image Search

General References

Google Scholar Search
Family References
General Botanical References for BC

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-05-09 4:21:55 AM ]

Disclaimer: The information contained in the E-Flora atlas pages is derived from expert sources as cited in each section. This information is scientifically based. E-Flora also acts as a portal to other sites via deep links. As always, users should refer to the original sources for complete information. E-Flora BC is not responsible for the accuracy or completeness of the original information.