Hauke, R.L. 1978: A taxonomic monograph of Equisetum subgenus Equisetum. Nova Hedwigia 30: 385–455.
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| Hauke, R.L. 1978: A taxonomic monograph of Equisetum subgenus Equisetum. Nova Hedwigia 30: 385–455. |
| Hauke, R.L. 1978: A taxonomic monograph of Equisetum subgenus Equisetum. Nova Hedwigia 30: 385–455. |