Hypericum
St. John's-wort
12 species
2 subspecies and varieties
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Hypericum anagalloidesbog John's-wort, creeping St. John's-wort, tinker's penny
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Baja California, east to Montana, Utah, and Nevada.
Habitat: Moist ground, from the coast to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Hypericum androsaemumtutsan
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California.
Habitat: Lowland thickets, stream banks, ledges, weedy slopes, trails, and railroads.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Perennial
Hypericum borealenorthern St. John's-wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California.
Habitat: Coastal shores, damp sand, peatlands, ditches, and cranberry farms.
Origin: Introduced from eastern North America
Flowers: May-July
Growth Duration: Perennial
Hypericum calycinumAaron's beard, great St. John's-wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California; also in eastern North America.
Habitat: Roadsides, cliffs, embankments, fields, parks, forest edge, wastelots, and other disturbed areas.
Origin: Introduced from Turkey and Bulgaria
Flowers: May-July
Growth Duration: Perennial
Hypericum canadenseCanadian St. John's-wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to southwestern Oregon.
Habitat: Coastal, shores, damp sand or peat, damp or wet disturbed ground, and cranberry farms.
Origin: Introduced from eastern North America
Flowers: July-September
Growth Duration: Annual, Perennial
Hypericum ellipticumpale St. John's-wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to southwestern Washington.
Habitat: Coastal, damp sand and peat, and cranberry farms.
Origin: Introduced from eastern North America
Flowers: June-August
Growth Duration: Perennial
Hypericum maculatumspotted St. John's-wort, streaked St. John's-wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to southwestern Washington, also in northern Idaho.
Habitat: Shores, disturbed ground, and ditches.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
ssp. obtusiusculum – dotted John's-wort, imperforate St. John's-wort
Hypericum majusgreater Canadian St. John's-wort
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to the Atlantic Coast.
Habitat: Peatlands, shores, damp sand, and cranberry farms.
Origin: Both native and introduced from eastern North America
Flowers: July-September
Growth Duration: Perennial
Hypericum mutilumdwarf St. John's-wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to western Washington; also in eastern North America, where native.
Habitat: Shores, often where peaty.
Origin: Introduced from eastern North America
Flowers: July-September
Growth Duration: Annual, Perennial
Hypericum perforatumcommon St. John's-wort, Klamath weed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Noxious weed of fields, meadows, roadsides, forest edge, wastelots, and other disturbed areas from the lowlands to near subalpine.
Origin: Introduced from Europe
Flowers: June-July
Growth Duration: Perennial
Hypericum scouleriNorton's St. John's-wort, Scouler's St. John's-wort, western John's-wort
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Moist places from along the coast to well up in the mountains.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Hypericum tetrapterumsquare-stalked St. John's Wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to southwestern Washington.
Habitat: Freshwater intertidal marshes, floating logs, and damp gravel.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial