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Updated: May 9, 2025
In such a site in the temperate zone, the cyperaceous and gramineous plants would have formed vast meadows; here the soil abounded in aquatic plants, with sagittate leaves, and especially in basil plants, among which we noticed the fine flowers of the costus, the thalia, and the heliconia.
The water-lilies are a well known instance, exhibiting sagittate leaves in the juvenile stage and changing in many species, into nearly circular peltate forms, of which Victoria regia is a very good example, although its younger stages do not always excite all the interest they deserve.
The foliage of the mimosas, though constantly enveloped in the hot vapours, displayed the most beautiful verdure. An arum, with a woody stem, and with large sagittate leaves, rose in the very middle of a pool the temperature of which was 70 degrees. Plants of the same species vegetate in other parts of those mountains at the brink of torrents, the temperature of which is not 18 degrees.
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