Description from Flora of China
Buddleja legendrei Gagnepain; B. minima S. Y. Pao.
Shrubs 1--4(--9) m tall. Branchlets 4-angled to subterete, stellate tomentose, glabrescent; long branchlets delicate, declinate on apical parts. Leaves alternate; leaf blade short stellate tomentose on both surfaces or adaxially glabrescent, margin entire or undulately dentate. Leaves on long vegetative branchlets with petiole 1--2 mm; leaf blade very narrowly elliptic to almost linear, 3--10 X 0.2--1.3 cm, base cuneate, apex acuminate to obtuse. Leaves on floriferous branchlets shortly petiolate to subsessile; leaf blade 5--15 X 2--10 mm, base cuneate to decurrent, apex rounded to obtuse. Inflorescences only on short lateral branchlets, paniculate cymes or glomerules, 1--4.5 X 1--3 cm; peduncle very short, usually with 2 leaflets at base. Flowers fragrant. Calyx campanulate, 2.5--4 mm, outside stellate tomentose and with some glandular hairs, inside with a few minute glandular hairs on apical half; lobes triangular, 0.5-1.7 mm. Corolla lilac, violet, or purple, with an orange throat, tube 6--10 X 1.2--1.8 mm; lobes suborbicular to broadly ovate, 1.2--3 X 1.2--3 mm, both surfaces stellate tomentose but glabrescent. Stamens inserted at middle of corolla tube; anthers oblong, 1--1.8 mm. Ovary ovoid to subovoid, 1--2 mm, glabrous. Style ca. 1 mm; stigma large, clavate. Capsules ellipsoid, ca. 5 X 2 mm, glabrous. Seeds narrowly oblong, 1.5--2 mm, winged all around. Flowering Mar-Jul.
Buddleja X wardii C. Marquand has been named for what is probably a hybrid between B alternifolia and B. crispa (C. Marquand, J. Linn. Soc., Bot. 48: 203. 1929). This hybrid
species has been collected in SE Xizang and has the following characteristics: Shrubs 1--5 m tall. Branchlets stellate tomentose, glabrescent. Leaves opposite or alternate; leaf blade
elliptic to subelliptic, 0.5--5 X 0.3--2 cm, shortly stellate tomentose, margin repand-crenate, apex acuminate to acute. Inflorescences cymose, 1.5--2 cm in diam. Calyx campanulate, tube
ca. 2 mm; lobes triangular, 0.5--0.7 mm, outside densely stellate tomentose. Corolla lilac, with an orange throat, tube 6--7 X 1--1.5 mm. Stamens inserted at middle of corolla tube,
included. Ovary subglobose, ca. 1 mm in diam., stellate tomentose. Style longer than ovary. Capsules subellipsoid, ca. 5 mm in diam., stellate tomentose.
* Thickets on river banks, along dry river beds; 1500--4000 m. Gansu, Hebei, Henan, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shanxi, Sichuan, Xizang