Thanks to those that checked up on Acorus tatarinowii for me. Looking in the Flora of China by Hen Li, A. gramineus has leaves less than 6mm and A. tatarinowii has leaves greater than 7mm. Is the width of a leaf a valid justification to name a species even if all else is the same? Growing conditions can have a great effect on the size of a plant. Mike Bordelon Botany Greenhouse Smithsonian Institution