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The widely varied family includes also the dwarf ginseng ( P. trifolium ) of North America; the English ivy ( Hedera helix ), a popular ornamental evergreen vine; the Hercules'-club, devil's-club, or devil's-walking-stick (names applied to several related species) of North America and E Asia, used locally for medicinal purposes; and the rice-paper plant ( Tetrapanax papyriferus ) of China, the pith of which is used to make Chinese rice paper.
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