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

Hypericum mutilum L.
small Canadian St. John's-wort (dwarf St. Johnswort)
Clusiaceae

Introduction to Vascular Plants

© Frank Lomer  Email the photographer   (Photo ID #29110)

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Distribution of Hypericum mutilum
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SUBTAXA PRESENT IN BC
Hypericum mutilum var. mutilum

Species Information

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General:
Perennial or sometimes annual herb from a fibrous root; stems erect, much branched above, glabrous, 10-75 cm tall.
Leaves:
Stem leaves lanceolate to elliptic or rounded, unstalked, obtuse to abruptly sharp-pointed, 3-5 nerved, 1-3 cm long, 0.5-1.5 cm wide, partly clasping at the base, glabrous.
Flowers:
Inflorescence 20-100 flowered, spreading; petals orange-yellow, 1-2 mm long; sepals linear-oblong, abruptly sharp-pointed, 2-3 mm long; stamens less than 20; styles 3.
Fruits:
Membranous capsules, 2.5-4.0 mm long; seeds yellowish, 0.5 mm long, longitudinally grooved and finely transversely corrugate.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Yellow
Blooming Period:
Mid Summer
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Wet to moist river banks and disturbed areas 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.

Synonyms and Alternate Names

Hypericum mutilum subsp. boreale (Britton) J.M. Gillett
Hypericum mutilum var. latisepalum Fernald
Hypericum mutilum var. parviflorum (Willd.) Fernald

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References