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Equisetum hyemale subsp. affine (Engelm.) Calder & Roy L. Taylor
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Equisetum hyemale var. elatum (Engelm.) C.V. Morton
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Taylor, W. C. & Demaree. 1979. Annotated list of the ferns and fern allies of Arkansas. Rhodora 81(828): 503–548.
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Equisetum hyemale var. pseudohyemale (Farw.) C.V. Morton
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Taylor, W. C. & Demaree. 1979. Annotated list of the ferns and fern allies of Arkansas. Rhodora 81(828): 503–548.
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Equisetum hyemale var. robustum (A. Braun ex Engelm.) A.A. Eaton
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Taylor, W. C. & Demaree. 1979. Annotated list of the ferns and fern allies of Arkansas. Rhodora 81(828): 503–548.
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Equisetum praealtum Raf.
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Taylor, W. C. & Demaree. 1979. Annotated list of the ferns and fern allies of Arkansas. Rhodora 81(828): 503–548.
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Equisetum prealtum Raf.
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Stolze, R. G. 1983. Ferns and fern allies of Guatemala. Part III. Marsileaceae, Salviniaceae, and the fern allies (including a comprehensive index to parts I, II, and III). Fieldiana, Bot., n.s. 12: 1–91.
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Equisetum prealtum var. affine (Engelm.) M. Broun
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Stolze, R. G. 1983. Ferns and fern allies of Guatemala. Part III. Marsileaceae, Salviniaceae, and the fern allies (including a comprehensive index to parts I, II, and III). Fieldiana, Bot., n.s. 12: 1–91.
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Equisetum robustum A. Braun ex Engelm.
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Taylor, W. C. & Demaree. 1979. Annotated list of the ferns and fern allies of Arkansas. Rhodora 81(828): 503–548.
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Equisetum robustum var. affine Engelm.
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CONABIO. 2009. Catálogo taxonómico de especies de México. 1:. In Capital Nat. México. CONABIO, Mexico City.
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Mickel, J. T. & A. R. Smith. 2004. The Pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1–1054.
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Mickel, J. T. & J. M. Beitel. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1–568.
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Smith, A. R. 1981. Pteridophytes. 2: 1–370. In D.E. Breedlove (ed.) Fl. Chiapas. California Academy of Sciences, San Francisco.
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