Siberian iris (Iris sanguinea): https://en.wikipedia.org/wiki/Iris_sanguinea
Siberian Iris, Arakawa River, Kofu, Yamanashi, 4/29/2025
Cornflower (Centaurea cyanus): https://en.wikipedia.org/wiki/Centaurea_cyanus
Cornflowers, Arakawa River, Kofu, Yamanashi, 4/29/2025
Hairy vetch (Vicia villosa): https://en.wikipedia.org/wiki/Vicia_villosa
Hairy vetch, Arakawa River, Kofu, Yamanashi, 4/29/2025
Centaurea cyanus and Vicia villosa are considered invasive in Japan. They are non-native plants that have been introduced and can spread aggressively.