Description from Flora of China
Veronica sibirica Linnaeus, Sp. Pl. ed. 2, 12. 1762; V. sibirica var. glabra Nakai.
Rhizomes horizontal, to 13 cm, internodes short. Stems erect, simple, terete, glabrous or sparsely villous and with multicellular hairs. Leaves in whorls of 4-6, sessile, oblong to broadly linear, 8-15 X 1.5-4.5 cm, glabrous or sparsely hirsute and with multicellular hairs. Inflorescences terminal; bracts long caudate, glabrous. Calyx less than 1/2 as long as corolla; lobes subulate. Corolla red-purple, purple, or pale purple, 5-7 mm; tube tubular, straight, apically hairy inside; limb actinomorphic; lobes 1.5-2 mm. Capsule ovoid, ca. 3.5 mm. Seeds ellipsoid. Fl. Jul-Sep.
Trailsides, grassy slopes, thickets; below 2500 m. E Gansu, Hebei, Heilongjiang, Jilin, Liaoning, Nei Mongol, N Shaanxi, N Shanxi, Shandong [Japan, Korea, Mongolia, Russia].