Rather strict glab. perennial up to ± 25 cm. tall; stems us. branched from base, 4-angled. Lvs in distant sessile pairs, (5)-10-15-(20) × (2)-4-5-(7) mm., ascending, lanceolate-oblong to oblong, subcordate at subamplexicaul base, obtuse to subacute; margins ± revolute. Fls in terminal few-fld trichotomous cymes (occ. solitary) 8-12 mm. diam. Bracts ± foliaceous. Sepals about ovate, subacute to obtuse, up to c. 5 mm. long; petals golden yellow, up to c. 9 mm. long; styles 3; stamens free or nearly so. Capsule ovoid, acute, 1-celled, 3-valved, ± 6 mm. long.

2n = 16

n = 8

Erect, wiry, perennial herb, to 25 cm tall, from woody stock, lacking black glands. Stems not branched or branched only from base, slender, 4-angled. Lvs in distant pairs, (5)-8-16-(20) × (2)-4-6-(8) mm, lanceolate, ovate or oblong, with numerous pellucid glands; margins ± revolute (especially in dried lvs); base subcordate, ± amplexicaul. Fls terminal, solitary or few in cymes. Sepals 3-5-(7) mm long, ± ovate. Corolla (6)-8-16 mm diam., golden yellow, c. 1.5-2× sepals. Stamens not in bundles. Styles 3. Capsule 4-7-(9) mm long, ovoid, dry. Seeds 0.4-0.8 mm long, cylindric or broad-cylindric.