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| [26.] |  | Rendle, A. B. Sisyrinchium californicum Dryand.Journal of Botany, Vol XXXIV. p. 494. 1896. |
| Marshall, E. S. Sisyrinchium californicum in Ireland. Ibid. p. 366. |
| [27.] | | Reid, Clement. The Origin of the British Flora. London, 1899. |
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