Ceratophyllum submersum. Soft hornwort or tropical hornwort

Life-form & Growth Form:  

Hydrophyte. Herbaceous perennial. Spreads vegetatively through irregular fragmentation.

Flowering period: 

June to July.

Habitats: 

Base-rich lakes, ponds and ditches. Coastal grazing marshes. Lowland.

Threats:

Eutrophication from adjacent agricultural activities. Ecological succession is reducing open water areas as lakes transition into tall herb, fen and wet woodland communities. Drainage of wetlands to create agricultural land. Infilling of small lakes and ponds.

Distribution map:
Ceratophyllum submersum
Ceratophyllum submersum

For an interactive map follow this link to the BSBI webpage