- Scientific Name: Ceratophyllum demersum L.
- Common Name: Coontail, hornwort
- Group: Dicot
- Family: Ceratophyllaceae (Hornwort family)
- Wetland Indicator Category: OBL
- Perennial
- Growth Form: Submerged/floating, not rooted in sediment
- Grows in ponds, lakes, marshes, swamp, slow streams
- Native
- Often forms dense floating mats.
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