Valeriana dioica

Valeriana dioica, the marsh valerian, is a species of flowering plant in the family Caprifoliaceae, native to North America, Europe and Anatolia. It is typically found in calcareous fens. It is a dioecious species, with male and female flowers on separate individuals, and it is pollinated by small flies.

Varieties
The following varieties are currently accepted:
 * Valeriana dioica var. dioica
 * Valeriana dioica var. sylvatica S.Watson – northern North America