What was it?
I have written to ask Sclater, also about birds of Madeira and Azores.

It is a very curious thing that the Azores do not contain the (non-European) American genus Clethra, that is found in Madeira and Canaries, and that the Azores contain no trace of American element (beyond what is common to Madeira), except a species of Sanicula, a genus with hooked bristles to the small seed-vessels.

The European Sanicula roams from Norway to Madeira, Canaries, Cape Verde, Cameroons, Cape of Good Hope, and from Britain to Japan, and also is, I think, in N.America; but does not occur in the Azores, where it is replaced by one that is of a decidedly American type.
This tells heavily against the doctrine that joins Atlantis to America, and is much against your trans-oceanic migration--for considering how near the Azores are to America, and in the influence of the Gulf-stream and prevalent winds, it certainly appears marvellous.

Not only are the Azores in a current that sweeps the coast of U.States, but they are in the S.W.winds, and in the eye of the S.W.

hurricanes! I suppose you will answer that the European forms are prepotent, but this is riding prepotency to death.
R.T.Lowe has written me a capital letter on the Madeiran, Canarian, and Cape Verde floras.
I misled you if I gave you to understand that Wollaston's Catalogue said anything about rare plants.