Description from Flora of China
Vandellia brevipedunculata (Migo) T. Yamazaki.
Herbs, glabrous. Roots branched, fibrous. Stems procumbent, to 30 cm, quadrangular, diffuse, much branched, rooting from nodes; branches spreading. Petiole 3-5 mm; blades of stem leaves and long branches ovate-elliptic, lanceolate-oblong, or oblanceolate, 1.5-2 X 0.4-1 cm, base gradually narrowing, margin obscurely crenate; leaves on short branches 1/3-1/2 as long as those on stem. Flowers axillary and paired or in apical racemes. Pedicel slender, ca. 6 mm, gradually shorter upward, ridged. Calyx campanulate, basally connate; lobes linear-lanceolate, ca. 5 mm, erect, spreading flat. Corolla violet, 7-8 mm. Filaments of anterior stamens filiform, ca. 1.5 mm, appendiculate; posterior filaments ca. 1 mm. Style 2-lobed. Capsule cylindric-oblong, ca. 2 X as long as persistent calyx; style persistent.
* Zhejiang (Lin'an Xian).