Description from Flora of China
Blumea riparia Candolle var. megacephala Randeria, Blumea 10: 215. 1960.
Subshrubs or shrubs, perennial, scandent; branches elongated, to 4-6 m. Stems woody, 2-3 cm in diam., terete, striate, glabrate or sparsely puberulent particularly on synflorescence axes and on younger parts. Cauline leaves thick, oblong, 9-11 × 2.5-4 cm, glabrate or minutely pilose on surfaces, base obtuse to cuneate, margin remotely mucronulate or mucronulate-denticulate, apex shortly acuminate; veins 5 or 6 pairs. Capitula hemispheric, 10-15 × 12-13 mm, in terminal and axillary lax panicles. Phyllaries in 3 or 4 series, usually distinctly purple tipped, outer ones shorter, linear-lanceolate, 2-4 × ca. 1 mm, with multicellular hairs, inner linear-lanceolate, 8-9 × ca. 0.9 mm, ciliate. Receptacle flat, 6-11 mm in diam., with white, multicellular hairs. Corollas yellow, tubular; marginal florets 8-9 mm, 3- or 4-lobed; central florets 9-10 mm with 5 triangular lobes, lobes with sessile glands and multicellular hairs. Achenes oblong to cylindric, 1.2-1.4 × ca. 0.5 mm, 10-ribbed, sparsely hirsute. Pappus white, 5-6 mm. Fl. Aug-Apr. 2n = 16.
Thickets, grassy slopes at forest margins; 100-1900 m. Fujian, Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Japan (Ryukyu Islands), Thailand, Vietnam].