Henslow has sent him Darwin's Galapagos plants along with Macrae's. Hooker impressed by the island endemism, which "overturns all our preconceived notions" on centres of radiation. Describes the extent, and the sharp demarcation at longitude 60° W, of the American and European Northern Hemisphere floras. Darwin's plants among those he is using to do Antarctic flora. Drimys winteri shows a graded series of states down the length of the South American continent.
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