monograph of Equisetum subgenus Equisetum. Nova Hedwigia 30: 385--455. Equisetum hyemale, Equisetum laevigatum, Equisetum ramosissimum, Equisetum scirpoides
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81--109. Hauke, R.L. 1979. Equisetum ramosissimum in North America. Amer. Fern J. 69: 1--5. Equisetum subg. Equisetum, Equisetum subg. Hippochaete window
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Oreg., Wis., Wyo. Equisetum × nelsonii, the hybrid between E. laevigatum and E. variegatum, is often mistaken for small forms of E. × ferrissii. None
2 KB (173 words) - 21:23, 5 November 2020