Shrubs small, erect. Stems 60--120 cm, many branched; branches 4--6-angulate, shallowly 4--6-grooved, glabrous; axillary branchlets 0.2--4 cm, puberulous. Leaves simple; petiole 1--4 mm; leaf blade lanceolate-linear or linear, 1.4--3.5(--4.5) × 0.2--0.6(--0.8) cm, papery, both surfaces subglabrous or abaxially puberulous on midvein and adaxially sparsely puberulous; midvein abaxially slightly prominent, lateral basal veins obscure. Flowers solitary and terminal on short, axillary branchlets, 2--3.5 cm in diam.; pedicel slender, 1.4--4 cm, puberulous. Sepals 4, yellow, ascending, ovate or subelliptic, 1.4--2.7 × 0.7--1.3 cm, abaxially sparsely puberulous, adaxially glabrous, margin narrowly winglike, velutinous on inner line, apex apiculate. Stamens 6--13 mm, glabrous; filaments linear; anthers oblong or narrowly so, 2.5--4 mm, apex obtuse or acute. Ovaries densely pubescent; style 6--9 mm, densely villous. Achenes compressed, elliptic or narrowly obovate, 4--6 × 2.5--3.5 mm, densely pubescent; persistent style (2--)3--3.5 cm, plumose. Fl. Jun--Aug.
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