UW Burke Herbarium species comparison

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Hypericum majus

Hypericum tetrapterum

greater Canadian St. John's-wort

square-stalked St. John's Wort
Habit Perennial from short, leafy rhizomes, the stems upright, 1-5 dm. tall, simple or branched above. Perennial, the stems 4-winged, erect, 4-10 dm. tall.
Leaves

Leaves opposite, sessile, lanceolate to oblong, rounded, 1-3.5 cm. long, 5- to 7-nerved.

Leaves opposite, sessile, somewhat clasping, ovate-lanceolate to oblong-ovate, with translucent dots.
Flowers

Inflorescence of terminal cymes with small, linear bracts;

sepals 5, lanceolate, 4-7 mm. long;

petals 5, yellow, about equal to the sepals;

stamens 15-35, the filaments almost capillary, distinct;

styles 3, short.

Inflorescence of leafy-bracteate cymes;

sepals 5, pointed, not black-dotted;

petals 5, pale yellow;

flowers about 10 mm. wide;

stamens numerous, styles 3.
Fruits

Capsule 3-celled.

Capsule 3-celled.

Hypericum majus

Hypericum tetrapterum
Flowering time July-September July-September
Habitat Peatlands, shores, damp sand, and cranberry farms. Freshwater intertidal marshes, floating logs, and damp gravel.
Distribution
Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
Occurring west of the Cascades crest in Washington; southwestern British Columbia to southwestern Washington.
[BONAP county map]
Origin Both native and introduced from eastern North America Introduced from Europe
Conservation status Sensitive in Washington (WANHP) Not of concern
Sibling taxa
H. anagalloides, H. androsaemum, H. boreale, H. calycinum, H. canadense, H. ellipticum, H. maculatum, H. mutilum, H. perforatum, H. scouleri, H. tetrapterum
H. anagalloides, H. androsaemum, H. boreale, H. calycinum, H. canadense, H. ellipticum, H. maculatum, H. majus, H. mutilum, H. perforatum, H. scouleri
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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