Herbs, perennial, to 80 cm tall. Stem many branched; branches stout, spreading, glabrous, with oil glands; branchlets angular. Leaves glabrous; petiole 4-6 mm or leaf subsessile; leaf blade ovate to rhombic but on basal part of branches lanceolate and on apical part of branches narrowly elliptic, 3-5 × 0.5-2 cm, thickly papery, with oil glands. Inflorescences many flowered; rachis pubescent when young; bracts linear to narrowly elliptic, margin ciliate. Flowers pedicellate. Sepals triangular-ovate, to 1 mm, basally connate. Petals yellow, ca. 3 × 1.5 mm, with scattered semipellucid oil glands. Staminal filaments flattened in ± their basal half. Ovary globose; style ca. 0.5 mm; stigma slightly enlarged. Capsule 4-or 5-carpelled, 3-4 mm in diam. when mature, with protruding oil glands when young, 2-seeded. Fl. May, fr. Sep.
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