PlantsHorsetails — Genus Equisetum
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Horsetail —  Equisetum arvense [1]
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Horsetail —  Equisetum ferrissii [1]
Tall Scouring-rush
Tall Scouring-rush —  Equisetum hyemale [1,2,3]
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Smooth Horsetail —  Equisetum laevigatum [1,2]
Evidence that species is found in Texas:
  1. Atlas of the Vascular Plants of Texas, Volume 2, B.L. Turner, Holly Nichols, Geoffrey Denny and Oded Doron, Botanical Research Institute of Texas (BRIT), Fort Worth, Texas, 2003.
  2. Shinners & Mahler's Illustrated Flora of North Central Texas, George M. Diggs, Jr., Barney L. Lipscomb, and Robert J. O'Kennon, Botanical Research Institute of Texas (BRIT), Fort Worth, Texas, 1999. An invaluable resource for identifying Texas plants. Excellent glossary.
  3. Rick's iNaturalist observations, nature observations of Richard K. Murphy. Identifications are not necessarily confirmed by other users.