Hypericaceae
St. John's Wort Family
2 genera
13 species
3 subspecies and varieties
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Hypericum anagalloidesbog John's-wort, creeping St. John's-wort, tinker's penny
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to Baja California, east to Montana.
Habitat: Moist ground, from the coast to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Hypericum androsaemumtutsan
Origin: Introduced from Europe
Hypericum borealenorthern St. John's-wort
Origin: Introduced from eastern North America
Hypericum calycinumrose-of-sharon
Distribution: West of the Cascades in Washington at low elevations.
Habitat: Escaped from cultivation in disturbed, urban settings.
Origin: Introduced from Turkey and Bulgaria
Flowers: May-July
Hypericum canadenseCanadian St. John's-wort
Origin: Introduced from eastern North America
Hypericum ellipticumpale St. John's-wort
Origin: Introduced from eastern North America
Hypericum maculatum
Origin: Introduced
ssp. obtusiusculum – dotted John's-wort, imperforate St. John's-wort
Hypericum majusgreater Canadian St. John's-wort
Distribution: Occurring in localities throughout Washington; British Columbia south to Oregon, east to the Atlantic Coast of North America.
Habitat: Wet ground.
Origin: Both native and introduced from eastern North America
Flowers: July-September
Hypericum mutilumdwarf St. John's-wort
Origin: Introduced from eastern North America
Hypericum perforatumcommon St. John's-wort, Klamath weed
Distribution: Widespread on both sides of the Cascades crest in Washington; widespread throughout much of North America.
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
Hypericum scouleri
Distribution: Widely distributed throughout Washington; British Columbia south 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
ssp. nortoniae – Norton's St. John's-wort
ssp. scouleri – Scouler's St. John's-wort, western John's-wort
Hypericum tetrapterumsquare-stalked St. John's Wort
Distribution: Introduced occasionally in western Washington.
Habitat: Damp wasteland.
Origin: Introdued
Flowers: July - September
Triadenum fraserimarsh St. John's-wort
Origin: Introduced from eastern North America