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A. tortuosum occurs across a vast area of Asia and consequently exhibits wide regional variation. This form used to be its own species -- A. helleborifolium -- but has now been swallowed alive into A. tortuosum where it is not recognized. Our plants are definitely different than the normal species so we retain the variety name. Variety helleborifolium is like the species but markedly taller and more cold tolerant. It also has spectacularly mottled stems.
Asia - China and Japan
Woodland, mountain forest, damp shady places, in the open, on roadsides, margins of clearings in sholas, 600-3900m.