Herbs, perennial, 40-100 cm tall. Stems sparsely branched, tomentose above. Leaves: basal leaves withered at anthesis; cauline leaves crowded, sessile or shortly petiolate (petiole ca. 2 mm), adaxially pale green, ovate, 3.5-5.5 × 1.5-2.5 cm, slightly papery, both surfaces hispidulous, abaxially gland-dotted, base rounded, margin subentire or sparsely serrate at middle part, basally 3-veined, apex acute; upper leaves smaller, few near synflorescence, 0.8-1.5 cm. Capitula numerous, in paniculate-corymbiform synflorescences, 0.6-1.5 cm in diam.; peduncles 0.5-1.6 cm, erect or spreading, ± strict, densely pubescent, sometimes with a bract ca. 1 mm. Involucres campanulate, 6-7 × ca. 7 mm; phyllaries 4- or 5-seriate, ?unequal, oblong-lanceolate, margin entire, ciliate, apex brown, obtuse to rounded; outer phyllaries 1.5-2 mm; inner phyllaries gradually longer, 4-4.5 mm. Ray florets white, tube ca. 3 mm, lamina 7-8 × ca. 1.5 mm; disk florets yellow, 4-4.5 mm, tube ca. 2.5 mm, limb ca. 2.8 mm. Achenes oblong, slightly compressed, ca. 2 × 0.8 mm, strigose, 4-6-ribbed. Pappus dirty white or reddish brown, of unequal bristles ca. 4.5 mm. Fl. Aug.

No specimens of Aster ovalifolius were seen by us. The description is partly based on the treatment by Soejima and C. I Peng (Fl. Taiwan, ed. 2, 4: 859-861. 1998).

● Sea level to low elevations. Taiwan.