Herbs perennial, erect or ascending, 10-60 cm tall. Stem weak, 4-ribbed, scabrous with sparse appressed hairs. Leaves decussate, becoming alternate near inflorescence, sessile or subsessile; leaf blade linear-lanceolate, oblong, or linear, 10-28 × 1-9 mm, surfaces scabrous, base rounded, margin thickened, serrate with 15-30 small teeth, apex obtuse. Inflorescence an indeterminate spike, branched; bracts leaflike, lanceolate to narrowly ovate, 0.5-1.5 × 0.3-0.5 mm, adaxially pubescent, margin thickened, entire; bracteoles brown, linear to lanceolate, 0.2-0.5 mm, membranous. Flowers erecto-patent, 4-merous; pedicel ca. 0.2 mm. Sepals green, triangular, 0.6-0.9 × 0.4-0.5 mm, glabrous, with a small, median-basal callus, margin thickened. Petals yellow, sometimes reddish, hooded, very shortly clawed, 1-1.5 × 0.3-0.5 mm, sparsely hirsute on keel. Stamens 8, ca. 1 mm. Ovary 4-loculed; styles clavate, 0.1-0.3 mm; stigmas reddish, capitate, fimbriate. Fruit silver-gray to dark gray, broadly ellipsoid, 0.7-1 × 0.8-1 mm, weakly 4-angled or 8-ribbed, with up to 2 oblique calluses between ribs, scabrous, with short, curved, appressed hairs confined almost entirely to ribs. Seed 1 per fruit. Fl. Mar-Oct, fr. May-Nov.
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Erect or ascending perennial herb 20–45 cm tall. Stems weak, 4-ribbed, scabrous in younger parts. Leaves decussate, becoming alternate above, subsessile, linear to linear-lanceolate, tapering, rounded basally, scabrous; lamina 1–2.8 cm long; margins thickened, serrate with 15–30 small teeth. Bracts leaflike, alternate, lanceolate to narrowly ovate, 0.8–1.5 mm long, entire, margins thickened; bracteoles membranous, linear, 0.2–0.5 mm long, brown. Flowers 4-merous; pedicel 0.2 mm long. Sepals linear-deltoid, 0.6–0.8 mm long, green; margins thickened; small basal callus. Petals 1–1.5 mm long, yellow to red. Stamens 8; anthers 0.7–1.1 mm long. Ovary 8-ribbed with up to 2 oblique calluses between ribs, scabrous or papillose, reddish grey to dark grey. Fruit 0.7–1 mm long, silver-grey to dark grey; pedicel 0.1–0.5 mm long.
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