Ceratophyllum muricatum -... en.wikipedia.org

Ceratophyllum muricatum... powo.science.kew.org

prickly hornwort... www.inaturalist.org

Ceratophyllum Muricatum --... earthpedia.earth.com

Ceratophyllum muricatum... powo.science.kew.org

Ceratophyllum - Wikipedia en.wikipedia.org

Ceratophyllum muricatum... powo.science.kew.org

prickly hornwort... www.inaturalist.org

Ceratophyllum aquaria.palo-alto.ca.us

Ceratophyllum muricatum... www.gbif.org

Plantsnap – Identify... www.plantsnap.com

Subspecies Ceratophyllum... www.inaturalist.org

hornwort - Encyclopedia of... eol.org

Coontail (Ceratophyllum... www.encyclo-fish.com

Habit (A), leaf-whorl (B),... www.researchgate.net

World Plants: Plant List www.worldplants.de

Flora of Mozambique:... www.mozambiqueflora.com

Plantsnap – Identify... www.plantsnap.com

HVAA - Ceratophyllum... herbariovaa.org

2013 BONAP North American... bonap.net