Hermaphrodite trees are enough to "knock" Darwin down. Can Hooker observe Eucalyptus to see whether pollen and stigma mature at same time? Hooker's facts showing European plants are more common in southern Australia than in South America are disturbing because they are improbable on Darwin's views of migration. Hooker said he would give examples of Australian forms that have migrated north along the mountains of the Malay Archipelago.
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