The seeds are produced in fruits called achenes that can be of two different types ; one type is dark brown with a shiny surface .
Is broadly egg - shaped , typically about 2.5 mm ( 1 - 10 inch ) long .
The seeds are produced in fruits called achenes that can be of two different types ; one type is dark brown with a shiny surface and is broadly egg - shaped , typically about 2.5 mm ( 1 - 10 inch ) long .