Plants perennial, glabrous, 20--50 cm tall, aromatic when dry. Stems erect, woody at base, terete or weakly angular in upper part. Leaves alternate, usually confined to upper 1/2 of stem, ± crowded toward apex; petiole 0.5--1.5 cm; leaf blade elliptic-lanceolate to narrowly lanceolate, 3--11 X 0.7--2.8 cm, abaxially ± glandular, base attenuate, apex acuminate to subacute; veins prominently reticulate. Pedicel 1.5--3(--5) cm. Flowers 1 or 2, in axils of leaves, rarely 3 or 4 flowers crowded at apex of extremely abbreviated branches. Calyx lobes triangular, ca. 2.5 mm. Corolla yellow, 0.9--1.1 cm, deeply parted; lobes linear, 8--10 X 2--3 mm, apex obtuse. Filaments connate basally into a ca. 0.5 mm high ring, free parts 1--1.5 mm; anthers 4--5 mm, basifixed, opening by apical pores. Capsule subglobose, ca. 4 mm in diam.
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