Herbs erect or ascending to divaricate, with rooting, sometimes creeping, branching base, 4–9.5 dm. Stems <sometimes clustered>, internodes not lined, with black glands scattered all over. Leaves usually ascending, sometimes spreading, sessile; blade usually ovate-lanceolate to triangular-lanceolate or narrowly elliptic, rarely ovate, 18–45 × 6–16(–20) mm, base cordate to rounded, margins plane, apex usually acute, rarely obtuse to rounded, midrib with 3–4 pairs of branches, <tertiary veins densely reticulate toward margins>, black glands intramarginal (dense) and laminar (scattered). Inflorescences subcorymbiform to broadly pyramidal, 16–164(–280)-flowered, <subsidiary branches ascending to widely spreading>. Flowers 10–20 mm diam.; sepals not imbricate, erect in fruit, lanceolate to ovate or elliptic-oblong, subequal, (3–)3.7–4.9(–6) mm, apex acute; petals yellow, usually obovate, rarely elliptic, 6–14 mm; stamens 38–61; anther gland amber or pellucid; styles 5.4–8.5 mm. Capsules broadly ovoid, 3–6 × 2–4 mm, with longitudinal and lateral vittae or vesicles or only ovoid vesicles (all amber). Seeds not or scarcely carinate, 0.6–0.8 mm; testa linear-reticulate. 2n = 16.
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Erect perennial 4–8 dm, branched above; lvs sessile, lanceolate or narrowly elliptic to lance-ovate, the lower obtuse or subacute, the upper acute; infl many-fld, less compact than no. 16 [Hypericum punctatum Lam.]; fls 15–25 mm wide, sep lanceolate, acute or acuminate, 5–7 mm, conspicuously black-dotted; pet 8–12 mm, conspicuously dotted; stamens many, fascicled; styles 6–10 mm, seldom persistent; stigmas capitate; fr 5–7 mm, glandular as in no. 16; 2n=16. Moist or dry soil; Ill. to Okla., s. to Fla. and Tex. June–Aug.
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