Hypericum canadense L.

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, <usually diffuse>, 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, <margins sometimes ciliate, not setulose-ciliate>, apex acute to acuminate; petals golden yellow, <sometimes red-veined>, 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, <broadest proximal to middle>. Seeds 0.5–0.7 mm; testa finely linear-scalariform. 2n = 16.