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Family: ceratophyllaceae
Common name(s): Hornwort
Hardiness ratings: USDA zone 6 - 9 
General resources
Links for Ceratophyllum demersum
- BBC Gardening - Plant profile with horticultural details and garden uses.
 (1 photo)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 6-9) (2 photos)
- Garden.org - Community-assembled plant profile (6 photos)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (2 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (3 photos)
- Native Plant Society of Texas - Plant profile with basic characteristics, some horticultural information, and a distribution map within Texas. (2 photos)
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