larger Canadian St. Johnswort

(Hypericum majus)

Conservation Status


No image available

  IUCN Red List

not listed


NNR - Unranked

SNR - Unranked


not listed

Wetland Indicator Status
  Great Plains

FACW - Facultative wetland


FACW - Facultative wetland

  Northcentral & Northeast

FACW - Facultative wetland


Larger Canadian St. Johnswort is an erect, perennial forb that rises from a horizontal, underground stem (rhizome) and fibrous roots. It can be 4 to 24 in height but is usually no more than 20 tall. It spreads by producing short, leafy, above-ground, horizontal stems (stolons).

The stems are erect, slender, hairless, and leafy. They have few if any branches below the inflorescence. They are ridged below the base of each leaf. They do not have black glands.

The leaves are opposite, lance-shaped to narrowly oblong or narrowly elliptic, stalkless, and more or less pointing upward. The larger leaves are ¾ to 1½ long and to wide. They are broadly angled or rounded at the tip and broadly angled, rounded, or slightly heart-shaped and weakly clasping at the base. The bases of opposite pairs of leaves meet around the stem. They have 5 to 7 veins originating at the base: a prominent midvein; one prominent vein on each side of the midvein that extends in an unbroken arc to the tip; and one or two secondary veins. The outermost veins are strongly ascending at the base. The leaf blades are dotted with sunken, brownish, translucent glands. The upper and lower surfaces are hairless. The margins are untoothed.

The inflorescence is a branched cluster of few to many flowers at the end of the stem and at the ends of a few strongly ascending branches rising from leaf nodes immediately below. The terminal clusters together with the flowering branches form a compact, flat-topped or rounded array (cyme).

The flowers are small, ¼ to in diameter. There are 5 sepals, 5 petals, 14 to 21 stamens, and 3 styles. The sepals are green, lance-shaped, and to ¼ long. They are broadest below the middle and narrowly angled with straight sides along the tip. They are erect in bud, bent backward in flower. The petals are yellow, and 1 16 to long. They shrivel and turn brown but often remain attached as the fruit develops. The stamens are not grouped. The anthers are yellow. The styles are about 1 32 long. The stigmas are often reddish.

The fruit is a maroon, elliptical to cone-shaped, 3 16 to 4 16 long, 1-chambered capsule with numerous seeds. The capsule is pointed at the top.




4 to 24


Flower Color




Similar Species


The small flower size helps to distinguish this from other Hypericum species.

Northern St. Johnswort (Hypericum boreale) sepals are broadest near the middle. The capsule is rounded at the top.


Moist to wet. Meadows, fields, lakeshores, streamsides, edges of wetlands, roadside ditches, disturbed sites.




June to September




Distribution Map



2, 3, 4, 5, 7, 28.








Scattered but common

  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Magnoliopsida (flowering plants)  
  Superorder Rosanae  


Malpighiales (nances, willows, and allies)  


Hyperiaceae (St. Johnswort)  
  Tribe Hypericeae  
  Genus Hypericum (St. Johnswort)  
  Section Trigynobrathys  


  Hypericum canadense var. majus  

Common Names


greater Canadian St. John’s-wort

large St. Johnswort

larger Canadian St. Johnswort


The common name refers to the blooming period. The plant is usually in bloom on June 24, St. John’s Day.












Modified leaf at the base of a flower stalk, flower cluster, or inflorescence.



A branched, flat-topped or convex flower cluster in which the terminal flower opens first and the outermost flowers open last.



Long, straight, and narrow, with more or less parallel sides, like a blade of grass.



The small swelling of the stem from which one or more leaves, branches, or buds originate.



A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.



An outer floral leaf, usually green but sometimes colored, at the base of a flower.



In plants, the portion of the female part of the flower that is receptive to pollen. In Odonata and Hymenoptera, a blood-filled blister or dark spot at the leading edge of each wing toward the tip, thought to dampen wing vibrations and signal mates. In Lepidoptera, an area of specialized scent scales on the forewing of some skippers, hairstreaks, and moths.



An above-ground, creeping stem that grows along the ground and produces roots and sometimes new plants at its nodes. A runner.



Part of the pistil, usually a slender stalk, connecting the ovary to the stigma(s).

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