Assam indigo; Strobilanthes cusia
A plant species used to produce indigo dye, native to the Ryukyu Islands and parts of Asia. The term refers both to the plant and the dye made from it.
Ryukyu indigo is a raw material for traditional Okinawan dye.
この布は琉球藍で染められています。
This cloth is dyed with Ryukyu indigo.