PlantsFlowering PlantsHornwort — Genus Ceratophyllum
Aquatic herbs without roots. Leaves whorled and forked into thread-like parts. Stamens 4-10. Family Ceratophyllaceae.
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Coon's Tail —  Ceratophyllum demersum [1]
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Spineless Hornwort —  Ceratophyllum echinatum [1]
Evidence that species is found in Texas:
  1. USDA Plants Database, advanced search for Texas plants from the United States Department of Agriculture.