In letters written earlier in the summer of 1862, Oxenden discussed various species of Epipactis, and promised to send CD specimens later in the season (see letters from G. C. Oxenden, 15 May 1862, 4 June [1862], and [before 21 June 1862]); Oxenden sent specimens of E. palustris with his letter of 8 July 1862. See also letter from G. C. Oxenden, 17 September [1862].