Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] ECOLOGY 147 Desert Conditions. — In the deserts of Central Africa and those of the Western United States the conditions of temperature, and especially lack of moisture, are essen- tially the same. We find in both regions plants the leaves of which are either very small or entirely lacking, their place having been taken by spines or thorns. In some plants, Agave, for example, leaves are present, but 'are thick and fleshy to hold wate
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] ECOLOGY 147 Desert Conditions. — In the deserts of Central Africa and those of the Western United States the conditions of temperature, and especially lack of moisture, are essen- tially the same. We find in both regions plants the leaves of which are either very small or entirely lacking, their place having been taken by spines or thorns. In some plants, Agave, for example, leaves are present, but 'are thick and fleshy to hold water. Cold Regions. — Here plants, which in lowland re- gions of greater warmth and moisture have a tall form and luxuriant foliage, are stunted and dwarfed; the leaves are smaller and tend to gather in rosettes or are otherwise closely placed for warmth and protection. As we climb a mountain we find the average Two plant societies: in the foreground plants living in conditions of much moisture; in the back- ground true mesophytes, a tree society.
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