Marsileaceae
| Marsileaceae Temporal range:  | |
|---|---|
| Pilularia (top) and Marsilea (bottom) | |
| Scientific classification | |
| Kingdom: | Plantae | 
| Clade: | Tracheophytes | 
| Division: | Polypodiophyta | 
| Class: | Polypodiopsida | 
| Order: | Salviniales | 
| Family: | Marsileaceae Mirb. | 
| Genera | |
| 
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Marsileaceae (/mɑːrˌsɪliˈeɪsi.iː/) is a small family of heterosporous aquatic and semi-aquatic ferns, though at first sight they do not physically resemble other ferns. The group is commonly known as the "pepperwort family" or as the "water-clover family" because the leaves of the genus Marsilea superficially resemble the leaves of a four-leaf clover. In all, the family contains three genera and 50 to 80 species with most of those belonging to Marsilea.