Perennial herb, 15-40 cm, stems slender, ascending, branching above, not rooting, terete. Leaves sessile or up to ¾ mm petiolate, 4-17 by 2-6 mm, lanceolate or ovate to elliptic-oblong, apex rounded, base cuneate to rounded (or the upper ones sometimes cordate-amplexicaul), paler beneath; 3-4 main lateral veins, with reticulate branchings, uniting near margin and apex; reticulate venation ± marked, dense; laminar glands pale, large, often prominent, dense, punctate; intramarginal glands black, dense. Inflorescence 1-c. 10-flowered, cymose, monochasial after 2nd grade, lax; pedicels sometimes exceeding uppermost leaves, 3-6 mm in fruit. Flowers 8-10 mm ø, concave; buds ellipsoid, obtuse. Sepals 3-5½ by 1-1 ½ mm, free, imbricate, lanceolate to elliptic-oblong, obtuse to rounded, entire; laminar glands pale, punctate or shortly striate, few; submarginal glands all black or basal ones pale. Petals yellow, 5-6 by 2 mm, narrowly obovate or oblong-obovate, persistent; apiculus absent; margin entire or with 1-2 subapical prominent glands; laminar glands absent or few near apex, pale, punctate; marginal glands black, few, sometimes prominent. Stamens in 3 (abnormally 4-5) fascicles, c. 30, longest c. 4 mm, c. 5/6 as long as the petals, persistent; anthers yellow; gland black. Ovary c. 3 mm, ellipsoid; styles 3 (abnormally 4-5), l½ mm, shorter than ovary, divergent; stigmas scarcely capitate; placentas 3 (abnormally 4-5), axile. Capsule 4-5 by 3-4 mm, broadly ovoid to subglobose, longitudinally vittate. Seeds mid-brown, ½ mm, cylindric-ellipsoid, not carinate, densely shallowly reticulate-scalariform.
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