Description from Flora of China
Sida yunnanensis var. longistyla J. L. Liu; S. yunnanensis var. viridicaulis J. L. Liu; S. yunnanensis var. xichangensis J. L. Liu.
Subshrubs erect, to 1 m tall. Branchlets stellate puberulent. Stipule filiform, ca. 5 mm; petiole 3-7 mm, stellate; leaf blade obovate, elliptic, or orbicular, 1-4 × 0.5-3 cm, abaxially stellate tomentose, adaxially sparsely minutely stellate puberulent to glabrous, base obtuse, margin dentate, apex obtuse to acute. Flowers subterminal, ± apically congested, mostly on reduced axillary shoots. Pedicel 3-4 mm at anthesis, to 1.5 cm in fruit, stellate puberulent, apically articulate. Calyx ca. 4 mm, minutely stellate puberulent, lobes triangular, acute to slightly acuminate. Corolla yellow, ca. 1 cm in diam.; petals obovate-lanceolate, ca. 8 mm. Filament tube usually hirsute. Mericarps 5-7, with vertical grooves, 3-4 mm, densely stellate, usually apically 2-awned. Fl. autumn-winter.
The original author suggested that Sida yunnanensis was related to S. spinosa Linnaeus, but it is distinguished by the broadly elliptic or obovate leaf blades (ovate-lanceolate in S. spinosa), shorter petioles (3-7 mm as opposed to 2-20 mm in S. spinosa), and the absence of the short nodal spines characteristic of S. spinosa. Paul (Fl. India 3: 290. 1993) included S. yunnanensis within S. rhombifolia var. rhombifolia, while Abedin (Fl. W. Pakistan 130: 81. 1979) accepted it and extended it to include material from India, Kashmir, Myanmar, and Pakistan.
● Scrub on slopes, grassy roadsides. Guangdong, Guangxi, Guizhou, Sichuan, Yunnan.