Well, there's a plant named Carvia Callosa, here's the link:
http://zipcodezoo.com/Plants/C/Carvia_callosa/http://en.wikipedia.org/wiki/Strobilanthes_callosus - here it say's that the plant is found in
India, so that could possibly explain why it's used in
China.
And Karvia is a municipality in Finland:
http://en.wikipedia.org/wiki/Karvia
