Sida cordata (Burm. fil.) Borss. Waalk.

Sida cordata var. nasirii Abedin was erected for a group of specimens from Pakistan with distinctive, very slender, purple pedicels.

Prostrate or semiprostrate herb, up to 80 cm tall. Profusely branched at the base, all parts stellate pubescent, mixed with simple spreading hairs on branches, petioles, pedicels and calyx. Leaves 1-5.5 cm long, 1-5 cm broad, narrowly to broadly ovate, lanceolate in terminal branches, crenate to serrate, cordate or rounded at base, acuminate at apex, lower surface stellate pubescent, upper one with stellate and simple, strigose hairs; stipules filiform, 2-4 mm long; petiole 1-4 cm long. Flowers axillary, solitary or pseudoraceme by reduction of leaves in the terminal parts; pedicel 1.5-2.5 cm long, in fruit up to 3.5 cm, jointed slightly above the middle. Calyx fused to the middle, 4-5 mm long and broad; lobes c. 2mm broad, acuminate. Corolla pale yellow, 7-8 mm across. Staminal column 2-3 mm long, simple hairy. Fruit depressed globose, 3-4 mm across, pubescent at the top, beaked; mericarps 5, dehiscent, membranous, smooth, disintegrated at the radial surfaces, 2.5 mm long. Seeds brown, c. 2 mm long, glabrous.

This is a highly variable species in indumentum and inflorescence. Variation in the inflorescence sometimes gives the illusion of the presence of at least 2 taxa. It has been observed in the herbarium specimens that there is continuous variation in the inflorescence hence the separation of taxa on the basis of this character is not advisable.

However, discontinous variation has been observed in the colour of branches and pedicels, and in the stiffness of pedicels on the basis of which 2 taxa may be easily delimited.

Subshrubs procumbent, to 1 m. Stems slender, with simple pilose hairs, stiffly stellate hairs, and sometimes small simple multicellular hairs. Stipule filiform, 2-3 mm, sparsely pilose; petiole 1-3 cm, with conspicuous long simple hairs; leaf blade broadly ovate, (1-)2-5 × 1.8-4.5 cm, both surfaces stellate puberulent and ± apressed pilose, base cordate, margin crenate or dentate, apex acuminate. Flowers usually solitary, axillary, often on leafy, racemelike, axillary shoots. Pedicel slender, 1.5-4 cm, articulate on distal part, sparsely stellate and with long hairs. Calyx cup-shaped, 4-6 mm, sparsely pilose with long hairs, lobes 2-3 mm, acute. Corolla yellow, 8-9 mm in diam. Filament tube ca. 2 mm, glabrous or sparsely pilose. Schizocarp nearly globose, ca. 3 mm in diam.; mericarps 5, ovoid-tetrahedral, ca. 2.5 mm, smooth, glabrous or sparsely minutely hairy at apex, apex not beaked, not awned. Fl. Jul-Feb.

A pantropical weed.

400-1800 m

Scrub, grassy roadsides. Fujian, Guangdong, Guangxi, Hainan, Taiwan, Yunnan [India, Philippines, Sri Lanka, Thailand; pantropical species of unknown origin].

Melochia cordata N. L. Burman, Fl. Indica, 143. 1768; Sida humilis Cavanilles; S. humilis var. veronicifolia (Lamarck) Masters; S. multicaulis Cavanilles; S. veronicifolia Lamarck; S. veronicifolia var. humilis (Cavanilles) K. Schumann; S. veronicifolia var. multicaulis (Cavanilles) E. G. Baker.

pilosa: pilose, with long soft hairs

Sida cordata là một loài thực vật có hoa trong họ Cẩm quỳ. Loài này được (Burm.f.) Borss.Waalk. miêu tả khoa học đầu tiên năm 1966.

长梗黄花稔（学名：Sida cordata）为锦葵科黄花稔属下的一个种。