| Family Name | Ceratophyllaceae |
| Scientific name | Ceratophyllum demersum L. |
| Common name | hornwort, rigid hornwort, coontail, or coon's tail |
| Growth habit | Inland and coastal ponds, lakes, and slow moving streams and rivers. |
| Leaf | The leaves are forked into 2 flattened or linear segments with small teeth along one margin. The leaves are often somewhat stiff or crunchy. |
| Flower | Tiny, submersed flowers are located at the leaf bases. |
| Fruit | The small (4-7 mm), hard, one-seeded, egg shaped fruit has 3 long spines (to 12mm); 1 spine at the fruit tip and 2 at the base. |
| More to learn | The direct use value of coastal wetlands including: wetlands gas regulation Water Conservation flood controlwater purification protect soil and resilience of coastal erosion |
| Properties | Pale, cool. stop bleeding and assist excretion |
| Treats | Hematemesis; hemoptysis; Astringent pain |
| Reference | General information on Ceratophyllum demersum L. Picture gallery on Ceratophyllum demersum L. Plant profile on Ceratophyllum demersum L. Cross reference on Ceratophyllum demersum L. in Chinese Cross reference on Ceratophyllum demersum L. in Chinese |