Stems frequently pink or reddish, especially with age, 1-6(-8) dm, stipitate glands hyaline or reddish brown and often black- or purple-tipped. Leaves: petiole absent or 1-10 mm; blade 2-18(-24) × 0.5-4(-5.5) cm, glabrous or sparsely stipitate-glandular abaxially and ad-axially, hairs black- or purple-tipped. Inflorescences secund, 2-7-branched, each branch (6-)10-25(-30)-flowered. Pedicels 0.5-3 mm. Flowers: hypanthium 0.5-1.5 × 1.5-3.5 mm; sepals persistent, erect or spreading, unequal, 0.8-2 × 0.4-1 mm, margins entire or serrulate with 1-4 gland-tipped teeth per side; filaments 1-2 mm; anthers 0.7-1 mm; pistil 3-4 mm; stigmas often purple with age. Seeds 0.5-0.7 × 0.2-0.3 mm, tubercles reddish or pinkish. 2n = 18.
"Erect, 2–7 dm, simple or branched above, glabrous below, stipitate- glandular in the infl; lvs lanceolate to narrowly elliptic, 5–10 cm, sharply serrate, acuminate at both ends; cymes 2–8 cm; sep oblong-lanceolate; capsule 5–6 mm wide; 2n=18. Marshes and muddy soil; Me. to Ont. and Minn., s. to Fla. and Tex. July–Sept."