[Facts] Carvia
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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
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