They sailed in from Madagascar, writes Thomas Pakenham, Irish, “extreme” tree lover and writer of “The Remarkable Baobab.” Imagine giant dhows full of giant baobabs making the voyage from Madagascar to the shores of East Africa! What really happened is more prosaic, but no less wondrous. It was the giant seedpods of the baobabs that bobbed over from the island to the mainland. And now baobabs can be found in most African countries. More…