Johnston, H.H. (1926). Additions to the flora of Orkney, as recorded in Watson's “Topographical Botany,” Second Edition (1883). Transactions of the Botanical Society of Edinburgh. 29: 297-307.
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Johnston, H.H.
1926
Additions to the flora of Orkney, as recorded in Watson's “Topographical Botany,” Second Edition (1883).
Transactions of the Botanical Society of Edinburgh