Rhipsalis in the West Indies (Classic Reprint) - Tapa blanda

Excerpt from Rhipsalis in the West Indies

These African species are of great interest from the standpoint of geographic distribution because they are the only cacti native in any part of the Old World. From the large preponderance of species in America it seems certain that the ancestors of the African kinds must have been transported from the American tropics to those of Africa in past geologic time, and the method of transportation, unless there was land connection between the continents, can only be guessed at. There are many genera in other families of plants common to the American and African tropics, however, and this indicates the probability of former land connection, over which theii' ancestors might have spread by we'll-known natural means.

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