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Family: hydrocharitaceae
Common name(s): American Frogbit
Hardiness ratings: USDA zone 8b - 11 
General resources
Links for Limnobium spongia
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 8b-11)
- Garden.org - Community-assembled plant profile
 (1 photo)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (3 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation.
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (6 photos)
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