white bush clover
Refers to a variety of bush clover (Lespedeza) with white flowers, often associated with autumn in Japanese poetry.
White bush clover is blooming in the garden.
Botanical name for a species of loosestrife, also known as 沼虎の尾 (numatoranoo). Less common in everyday language.
See also: ヌマトラノオ
Lysimachia fortunei is a perennial that grows in wetlands and produces white flowers in summer.
Compound of 白 (shira, 'white') and 萩 (hagi, 'bush clover'). The application to Lysimachia fortunei is likely due to a resemblance in flower shape or color.