Indigofera galegoides
Indigofera galegoides is a species of flowering plant in the family Fabaceae, native to India, South East Asia, Malesia, and southern China. It is a shrub usually  high and indigo dye may be extracted from it by the same harvesting and processing methods as Indigofera tinctoria. It grows in open places and valleys. References

galegoides
Flora of India (region)
Flora of Assam (region)
Flora of Bangladesh
Flora of Sri Lanka
Flora of Indo-China
Flora of Malesia
Flora of South-Central China
Flora of Southeast China
Flora of Hainan
Flora of Taiwan
Plants described in 1825