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A few scattered mangroves, and a leguminous tree, with rough cordate leaves, and large one or two-seeded legumes, were growing on the banks. We were obliged to turn southerly for a short distance, and found what we had fancied to be a river to be only a small creek. We crossed it about twelve or fourteen miles from the sea, but the water was brackish.
If this process should continue without any interference, the twentieth generation after as many years would consist of more than one million descendants of the original two-seeded annual plant, provided only that each individual of the intervening years should live a normal life and should multiply at the natural rate.
Professor Braun mentions a Fumariaceous genus, in which the flowers in the lower part of the spike bear oval, ribbed, one-seeded nutlets; and in the upper part of the spike, lanceolate, two-valved and two-seeded siliques.
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