Gymnostachys anceps R. Br., Prodr. F. Nov. Holl. I: 337. (1810). Gymnostachys is considered primitive in the Araceae family, and is not particularly related to Acorus calamus, even though, superficially it rather resembles A. calamus. No part of the plant - flowers, berries or leaves - has the characteristic odor. As one might recall, A. calamus leaves and stems have a characteristic sweet odor, and in fact, because of its odor, it is commonly called "sweet flag."