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Stems rarely more than 2 to 6 ft high, slender, smooth, green, bearing one to three branches at the joints, with spreading, creeping rhizomes. Leaf-blades 11⁄2 to 8 in. long, 1⁄6 to 5⁄8 in. wide, hairless or slightly hairy beneath, with three to seven pairs of secondary veins.
Native of China, introduced to Japan and perhaps thence to Europe. Closely related to A. simonii, which has taller, stouter stems and mostly larger leaves.