| Many plants produce only unisexual flowers, which contain either no stamens or no pistil. |
| Flowers are unisexual, dichogamous in nature and, thus, most species are open-pollinated. |
| The flowers are small and grouped together in dense, unisexual, wind-pollinated heads that dangle on thin stems. |
| As is the condition in other unisexual vertebrates, the silver crucian carp probably has a hybridization origin. |
| The genus has reduced unisexual flowers grouped into characteristic pseudanthia called cyathia. |
| Flowers are inconspicuous, few, unisexual, and enclosed in a leaflike spathe. |
