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Updated: June 7, 2025
Where did each come from? How did it get past or through the other, till each set of plants, after long internecine competition, settled itself down in the sheet of land most congenial to it? And when did each come hither? Which is the oldest? Will any one tell me whether the healthy floras of the moors, or the thymy flora of the chalk downs, were the earlier inhabitants of these isles?
The mapping out of extinct faunas and floras and assigning pedigree to existing species are by no means the whole province of geologists. Productive industry owes to them a vast saving of time and cost in searching for useful minerals. They distinguish the same strata in widely separated districts by means of the characteristic fossils, and are thus enabled to guide the miner.
Of European genera, not found in North America, the Lachen valley has Coriaria, Hypecoum, and various Cruciferae. The Japanese and Chinese floras are represented in Sikkim by Camellia, Deutzia, Stachyurus, Aucuba, Helwingia, Stauntonia, Hydrangea, Skimmia, Eurya, Anthogonium, and Enkianthus.
These means, however, would suffice for occasional transport across tracts of sea some hundred miles in breadth, or from island to island, or from a continent to a neighbouring island, but not from one distant continent to another. The floras of distant continents would not by such means become mingled in any great degree; but would remain as distinct as we now see them to be.
For this we are in some measure prepared by what we have seen of the Secondary or Mesozoic floras if, consistently with the belief in the theory of evolution, we expect to find the prevalence of simpler and less specialised organisms in older rocks. Pecopteris elliptica, Bunbury. We are struck at the first glance with the similarity of the ferns to those now living.
But, when we recollect, that even in Mexico no species of the genera cinchona and exostema has been discovered, either in the central table-land or in the plains, we are led to believe, that the mountainous islands of the West Indies and the Cordillera of the Andes have peculiar floras; and that they possess particular species of vegetation, which have neither passed from the islands to the continent, nor from South America to the coasts of New Spain.
The vegetation in the, neighbourhood of Lamteng is European and North American; that is to say, it unites the boreal and temperate floras of the east and west hemispheres; presenting also a few features peculiar to Asia.
"Natural history," he says, "by itself has no value; it is like a single sex; but marry it to human history and it is poetry. Whole Floras, all Linnæus', and Buffon's volumes contain not one line of poetry." Of course he speaks for himself. Natural facts, scientific truth, as such, had no interest to him. One almost feels as if this were idealism gone to seed.
Cultivated plains soon appear, where are united all the productions of the northern and tropical floras, terminating in prairies abounding with pineapples and yams, tobacco, rice, cotton-plants, and sugar-canes, which extend beyond reach of sight, flinging their riches broadcast with careless prodigality.
Thus it is recorded with eclat that the discovery of the close proximity of America at the northwest with Asia removes all difficulties as to the origin of the Occidental faunas and floras, since Oriental species might easily have found their way to America on the ice, and have been modified as we find them by "the well-known influence of climate."
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