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The root is perennial and sends up square, erect and branched stems, 2 to 3 feet high, which are very leafy and covered with a mealy down.
The heartshaped, toothed leaves are also covered with a soft, close down, especially on the under sides, which are quite white with it, so that the whole plant has a hoary, greyish appearance, as though it had had dust blown over it.