Veronica persica

Veronica persica, or bird's eye, Oh-inu-no-fuguri (scientific name: Veronica persica) is a herbaceous grass of the genus Stag beetle, which is native to Europe and is regarded as a naturalized plant in Japan.
From early spring to early summer, it is a wild grass that grows naturally throughout Japan, under trees, even in sunny meadows and urban areas. A very small blue flowers bloom so that they stick to the ground. It is a day flower blooming in the morning and closing in the evening. The Japanese name is disappointing because flowers are lovely.
In a similar flower, Nemophila menzyii 'insignis blue' (Nemophila menziesii 'Insignis blue ') .

Generic name: Veronica persica, Scientific name: Veronica persica, aka: Bird's Eye, Oh-inuno fuguri, Persian speedwell, Large field speedwell, winter speedwell, Place of origin: Europe , Habitat distribution: Japan nationwide, environment: field, grass height: 10 to 25 cm, leaf shape: broad ovoid, leaf height: 1 to 2 cm, leaf margin: saw tooth, flower symmetrical flowers : Flower inflorescence: spikes, corolla: 4 flowers, flower season: February to May, flower color: sky blue, flower diameter: 5 mm, stamens number: 2, remarks: moth flowers.