Abstract
The title of this discussion was suggested by a point which has been raised regarding a possible objection to the wide-spread distribution of hart's tongue plants as carried on by Mr. Ransier and myself during the last year or two. Writing to Dr. Campbell E. Waters last September on another matter, I asked if he did not want some small hart's tongue plants for naturalization near Washington. I quote from his reply: Thank you for your offer of plants of Scolopendrium, but I think you need not send me any of them. As far as I know there are no outcrops of limestone around here, though plenty in the Baltimore region. Another reason, if you can forgive me for saying it, is that I long ago came to the conclusion that it is a bad practice to upset our successors by introducing plants in a region far outside their natural range. In 1902 I had a lot of plants of Polystichum Braunii, and put some of them in selected spots. Later when my botanical conscience got to work after somebody had expressed the same opinion as that in the preceding sentence, I went the rounds to remove all of the introduced plants. Not one could be foundso I felt better.
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