. Foundations of botany. of the most importantcharacteristics of the plants of the zones and other areasmentioned above and to give some reasons why the plantpopulation of each has its special characteristics. 396. Tropical Vegetation. — Within the tropics two ofthe great factors of plant life and growth, namely, lightand heat, are found in a higher degree than elsewhereon the earth. Moisture, the third requisite, is in some 1 A. BOTANICAL GEOGRAPHY 325 regions very abundant (over sixteen feet of rainfall in ayear) or sometimes, in desert areas, almost lacking. Wefind here, acco
. Foundations of botany. of the most importantcharacteristics of the plants of the zones and other areasmentioned above and to give some reasons why the plantpopulation of each has its special characteristics. 396. Tropical Vegetation. — Within the tropics two ofthe great factors of plant life and growth, namely, lightand heat, are found in a higher degree than elsewhereon the earth. Moisture, the third requisite, is in some 1 A. BOTANICAL GEOGRAPHY 325 regions very abundant (over sixteen feet of rainfall in ayear) or sometimes, in desert areas, almost lacking. Wefind here, accordingly, the greatest extremes in amountof vegetation, from the bare sands or rocks of the Saharadesert (Fig. 229) to the densely wooded basm of theKongo and of the Amazon. Xerophytic plants, many ofthem with extremely complete adaptations for supportinglife for long periods without water, are characteristic oftropical deserts, while many of the most decided hydro-phytes among land-plants are found in the dripping sub-.
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