Bogs and Acidic Peatlands of Southern New England by Marsha C. Salett
Taxonomy
Hypericum canadense L.
CLUSIACEAE (Mangosteen Family)
EtymologyHypericum is derived from the ancient Greek word for St. Johnswort, hypereikon: hyper= above and eikon = picture, and so named because the flowers, which bloom in late June, were placed above images to ward off evil spirits at the ancient midsummer festival of Walpurgisnacht; canadense is Latin for from or of Canada.
DescriptionCanada St. John's-wort is a diminutive, annual (or perennial) herb that grows 4 -- 24" tall. It branches above the middle of its smooth, slender stem; tiny, yellow flowers are clustered at the tips of the branches.
Wetland indicator statusFACW
Plant Height4-24 inches
LeavesOpposite, simple, entire, 3/8 -1 1/2" long 3/16" wide; linear to narrowly oblanceolate; sessile (unstalked), 1-3 veins.
Flower/InflorescenceYellow, tiny (1/4"), 5 petals; in small clusters at tips of branches.
Flowering PeriodJuly-September
FruitCapsule, tiny (3/16 -1/4"), purplish-red, 3-parted.
HabitatPond and stream margins, wet meadows, sandy or muddy shores.
RangeNewfoundland and Quebec to Minnesota, south to Georgia and Alabama.
(c) 1998-2006 Marsha C. Salett