Perennial herb 0.2-0.7(-0.75) m, erect, glabrous, with branches at or just below ground level, each unbranched below inflorescence. Stems green, 4-lined, rather sparsely gland-dotted; internodes (mature) 3-11 mm long, exceeding leaves. Leaves sessile, subulate, appressed (squamiform and spreading in juvenile stems); lamina (l-)2.5-4 x 0.2-0.3 mm, linear-subulate, margin incurved, concolorous, not glaucous, subcoriaceous; apex acute, base parallel-sided, not decurrent, free; basal vein 1, unbranched; lamina glands in c. 2 lines, not prominent. Inflorescence up to c. 13-flowered, monochasial after 1st grade, sometimes with up to c. 9-flowered dichasial/monochasial or wholly monochasial branches from 1-2 lower nodes, without subsidiary flowering branches below, the whole subcorymbiform; pedicels 0.5-1 mm long: bracts 1-1.5 mm long, subulate. Flowersc. 3-4 mm in diam., stellate. Sepals 1.5-2 x 0.6-1 mm, unequal, ovate to elliptic or narrowly oblong, acute to subacute; veins 5, unbranched, all slightly prominent, midrib often apically indurated-cucullate; glands linear; margin irregularly ciliolate to entire. Petals yellow, 3.5-5 x 1.3-1.7 mm, c. 2.5 x sepals, obovate-oblong; apiculus subacute; glands linear, interrupted distally. Stamens 20-25, longest 1.5-2 mm long, c. 0.4 x petals. Ovary c. 2 x 0.5 mm, narrowly ovoid-pyramidal; styles 3, 1.5-2 mm long, 0.75-1 x ovary, spreading; stigmas capitate. Capsule (3.5-)4-6 x 1-1.5 mm, narrowly ovoid-conic, apex subrostrate, exceeding sepals. Seeds 0.5-0.6 mm long, not or scarcely carinate; testa scalariform-reticulate.