Description from Flora of China
Myosotis lingulata Lehmann; M. scorpioides Linnaeus subsp. caespitosa (C. F. Schultz) Hermann; M. uliginosa Schrader.
Herbs perennial, with dense fibrous adventitious roots. Stems unbranched, sometimes branched, 15-50(-70) cm tall, sparsely strigose. Lower stem leaves petiolate, oblong to oblanceolate, 2-3 cm × 3-8 mm, sparsely strigose, base attenuate, margin entire, apex obtuse; upper stem leaves sessile, oblanceolate to linear-lanceolate, 3-7 cm × 5-13 mm. Inflorescences elongated after anthesis, to 10-20 cm in fruit, ebracteate, or lower several flowers from axils of linear bracts. Pedicel divaricate, 6-8 mm in fruit, usually longer than calyx. Calyx campanulate, cuneate at base, 5-lobed nearly to middle, ca. 2 mm, to 3-4 mm in fruit; lobes triangular, stiff, sparsely strigose outside, apex obtuse. Corolla light blue, 2-3 mm; tube ca. as long as calyx; throat yellow, with 5 appendages; limb 3-4 mm wide; lobes divaricate, ovate, ca. 1.5 mm. Anthers elliptic, ca. 0.6 mm, upper appendages rounded, ca. 3 × as long as anthers. Nutlets dark brown, ovoid, 1.5-2 mm, smooth, narrowly marginate above, apex obtuse. 2n = 22, 44, 48, 86, 88.
Stream banks, moist places, slopes. Gansu, Hebei, Heilongjiang, Jilin, Liaoning, Sichuan, Xinjiang, Yunnan [N Africa, temperate and subtropical Asia, Europe, North America].