Perennial or annual herb, (2½-)5-72 cm, with stems erect or decumbent, branching strictly from the base (rarely elsewhere) or unbranched below the inflorescence, not rooting, 4-lined. Leaves sessile, 0.4-2.5 by 0.12-0.8 cm, lanceolate to linear or oblong or rarely ovate-lanceolate, apex obtuse to rounded, base cordate to rounded or sometimes cuneate, amplexicaul, ± glaucous beneath; 1-3 main basal veins, not or scarcely branched, with 1 or more lateral veins often visible; reticulate venation absent; laminar glands pale, not prominent, small and dense above, larger and laxer beneath; intramarginal glands absent. Inflorescence (l-2-)3-c. 30-flowered, cymose and regularly dichasial to monochasial or wholly monochasial, or with branches in uppermost leaf axil, or mixed, sometimes with subsidiary inflorescences from upper 1-3 leaf pairs, lax; pedicels usually exceeding uppermost leaves, 2-30 mm in fruit. Flowers (5-)6-12(-15) mm ø, plane; buds ellipsoid, subacute. Sepals 2.8-7.5(-9) by 0.8-2 mm, free, imbricate, lanceolate to narrowly elliptic, entire, acute to subacute, 3-5-nerved, often with ± prominent midrib, especially in fruit; laminar glands pale, linear towards the base, becoming punctate distally; marginal glands absent. Petals pale or bright yellow or orange, 5-10 by 2-5 mm, c. 1.3 times as long as the sepals, obovate to oblanceolate, entire, persistent; apiculus small, mucronate to rounded, lateral; laminar and marginal glands absent. Stamens not in apparent fascicles, c. 30-50, longest 2½-4mm, c. ¾ as long as petals; anthers yellow, gland amber. Ovary 1½-2.3 mm, narrowly ovoid-conic; styles 3,0.7-1.8 mm,½-9\10 as long as ovary, ± divergent; stigmas capitate; placentas 3, parietal. Capsule 2½-8 by l-3½(-4) mm, narrowly ovoid to cylindric, not vittate. Seeds yellow-brown, ½ mm, cylindric, not carinate, longitudinally ribbed with fine transverse striae.
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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.
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.
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