Buddleja formosana Hatusima; B. venenifera Makino.

Shrubs 1--1.5 m tall; leaves, petioles, and inflorescences tawny tomentose or pubescent with stellate hairs, glabrescent. Stems brown; branchlets terete or occasionally obscurely angular. Petiole 0.5--2 cm; leaf blade ovate, less often narrowly ovate to elliptic, 5--16 X 2--7 cm, base cuneate, rounded, or subtruncate, margin entire, subentire, or with some obscure teeth, apex acuminate, acute, or sometimes obtuse, lateral veins 5--7 pairs. Inflorescences terminal, spicate or thyrsoid cymes, 5--20 X 2--4 cm. Calyx campanulate, 2--3.5 mm, outside stellate tomentose and with minute glandular hairs; lobes ovate to triangular, 0.5--1 mm, inside glabrous. Corolla purple, 1.1--2 cm; tube dilated and curved, apically 1.4--2.5 mm in diam., basally 1.2--1.5 mm in diam.; lobes suborbicular, 1.5--2.5 X 1.5--2.5 mm, outside stellate tomentose or pubescent and with minute glandular hairs. Stamens inserted near or at middle of corolla tube; anthers oblong, 1.4--2 mm. Pistil glabrous. Ovary ovoid to subovoid, 1.8--2.5 X 1.2--1.5 mm. Capsules ellipsoid, 5--7 X 2--3 mm, glabrous. Seeds obliquely ellipsoid, 1.2--1.5 mm, winged at both ends. Fl. Apr-Sep, fr. Aug-Dec.

Thickets; 100--300 m. S Taiwan [Japan].