Northern Prairie Wildlife Research Center
Northeast Wetland Flora
Field Office Guide to Plant Species
Canadian St. John's-wort
Hypericum canadense L.
- Family: St. John's-wort (Guttiferae)
- Flowering: July-September
- Field Marks: This species is distinguished by its small yellow flowers, its linear 1- to 3-nerved leaves, its lanceolate sepals 1/8-1/4 inch long, and its purplish capsules.
- Habitat: Wet woods, wet meadows.
- Habit: Perennial herb forming basal offshoots.
- Stems: Upright, slender, branched, smooth, up to 2 feet tall.
- Leaves: Opposite, simple, linear to oblanceolate, rounded at the tip, tapering to the base, smooth, without teeth, 1- to 3-nerved, up to 1 3/4 inches long, up to 1/4 inch wide.
- Flowers: Several in cymes, each flower yellow, 1/6-1/4 inch across, subtended by linear bracts.
- Sepals: 5, green, free from each other, lanceolate, sharp-pointed at the tip, 1/8-1/4 inch long.
- Petals: 5, yellow, free from each other, oblong, rounded at the tip, 1/6-1/4 inch long.
- Stamens: About 20.
- Pistils: Ovary superior, smooth.
- Fruits: Capsules conical, purplish, smooth, 1/6-1/4 inch long.
- Notes: Gleason and Cronquist use the name Clusiaceae for this family.
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