Hypericum canadense L.
  • Sp. Pl. : 785 (1753)
  • Irish St John’s-wort

Cite taxon page as 'WFO (2023): Hypericum canadense L. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0001295682. Accessed on: 29 Mar 2023'

General Information

Herbs annual or perennial, erect, basal branches relatively few or none, usually with strict, ascending branches from distal nodes, 0.3–7.5 dm. Stems: internodes 4-angled. Leaves erect or spreading, sessile or subsessile; blade linear to oblanceolate-linear or (proximal) oblanceolate to obovate, 6–55 × 0.5–5.5 mm, papery to membranous, margins plane, apex rounded, basal or near-basal veins 1–3(–5), midrib with 1–4 pairs of branches. Inflorescences corymbiform to cylindric, , 1–35-flowered, branching mostly dichasial. Flowers 5–6 mm diam.; sepals linear-lanceolate to lanceolate, equal, 2.5–4.5 × 0.8–1 mm, , apex acute to acuminate; petals golden yellow, , narrowly obovate to elliptic, 2.5–4 mm; stamens 12–25, obscurely 3–5-fascicled; styles 0.5–0.8 mm; stigmas broadly capitate. Capsules narrowly conic to conic-cylindric, 4–6 × 1.5–3 mm, . Seeds 0.5–0.7 mm; testa finely linear-scalariform. 2n = 16.

  • Provided by: [A].Flora of North America @ efloras.org
    • Source: [
    • 1
    • ]. 

    Annual, or perennating by short, leafy stolons; stems slender, erect, 1–6 dm; lvs linear to narrowly oblanceolate, 1–4 cm × 1–4(–5) mm, obtuse, tapering to the narrow base, 1-nerved or weakly 3-nerved; infl compact to more often loose, usually with fewer fls than no. 21; bracts subulate; sep lanceolate, acute or acuminate, 3–5 mm; pet 2.5–3 mm; stamens 12–22; styles 3(4), under 1 mm; fr purple, mostly conic, 4–6 mm; seeds 0.5 mm; 2n=16. Sandy or muddy shores or wet meadows; Nf. and Que. to Minn., s. to Ga. and Ala., more common eastward. July–Sept. Hybridizes with several other spp.; one such apparent hybrid, approaching no. 21 [Hypericum mutilum L.] or 22 [Hypericum boreale (Britton) E. P. Bicknell], has been called H ×dissimulatum E. P. Bicknell.

  • Provided by: [C].Manual of Vascular Plants of Northeastern US and Canada
    • Source: [
    • 2
    • ]. 

    Nationally Preferred Names

    Irish St John’s-wortEnglishIE
    Beathnua gaelachIrishIE

    Other Local Names

    Canadian St. John’s wort, millepertuis de Canada


     Information From

    Flora of North America @ efloras.org
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • A Flora of North America Association
    World Flora Online Data. 2021.
    • B CC0 1.0 Universal (CC0 1.0).
    Manual of Vascular Plants of Northeastern US and Canada
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Irish Vernacular Names
    • D All Rights Reserved
    World Flora Online Consortium
    World Flora Online Data. 2017.
    • E CC0 1.0 Universal (CC0 1.0).