Aquatic and Wetland Vascular Plants of the Northern Great Plains
Araceae - The Arum Family
Rhizomatous perennials of bogs and swamps. Inflorescence scapose, consisting of a fleshy cylindric spadix subtended by a leaflike or bractlike spathe. Flowers small, crowded on the spadix, perfect or mostly so (in those included here); perianth of 6 tepals or absent; stamens 6, anthers short and broad, filaments flat and appressed to the ovary; pistil 1- to 3-carpellary, stigma sessile, ovary superior. Fruit dry or fleshy, gelatinous within, containing 1-few seeds.
| Lead | Characteristic | Go To |
| 1 | Leaves linear; spathe green, appearing as a leaflike extension of the scape, the spadix thus appearing lateral. | Genus Acorus |
| 1 | Leaves petioled with broadly heart-shaped blades; spathe white, clearly differentiated from the scape, the spadix terminal. | Genus Calla |
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