Description from Flora of China
Sida herbacea Cavanilles; S. holosericea Willdenow ex Sprengel; S. hongkongensis Gandoger; S. rotundifolia Lamarck ex Cavanilles.
Subshrubs erect, ca. 1 m tall. Branchlets, stipules, petioles, and leaves densely stellate strigose; branchlets and petioles velutinous, hairs ca. 3 mm. Stipule filiform, ca. 5 mm; petiole 1-2.5 cm; leaf blade ovate, 1.5-5 × 1-4 cm, abaxially velutinous on veins, base minutely cordate or rounded, margin crenate, apex obtuse to rounded. Flower solitary or fascicled, axillary or terminal. Pedicel 5-15 mm, densely stellate pilose and with long hairs, articulate in distal part. Calyx cup-shaped, lobes triangular, 5-6 mm, densely stellate pilose and with long hairs. Corolla yellow, ca. 1.5 cm in diam.; petals oblong, 6-8 mm. Filament tube ca. 6 mm, hirsute. Schizocarp 6-8 mm in diam.; mericarps 10, with vertical grooves, apex 2-awned, awn 3-4 mm, exceeding calyx, retrorsely barbed. Seeds long ovoid, apex hairy. Fl. year-round.
Scrub on slopes, grassy roadsides. Fujian, Guangdong, Guangxi, Hainan, Sichuan, Taiwan, Yunnan [Bhutan, India, Indonesia, Nepal, Pakistan, Philippines, Sri Lanka, Thailand; Africa, South America; ± pantropical].