Abstract
Summary Continuing part I of this paper (Flora 159, 539–572 (1970) the following species are investigated: Nitraria retusa, Tamarix senegalensis, Leptadenia pyrotechnica, Capparis decidua, Calotropis procera, Adenium honghel. They prove as types intermediate between the deciduous- raingreen (Acacia raddiana) and the true evergreen constitutions (Boscia senegalensis, Salvadora persica). The dilemma within the arid period, dry up or die of hunger, is solved either by the seasonable alternation of leaves, adapted to arid or rainy season by structure and quantity (Nitraria, Calotropis), or by evergreen switch-branches (Tamarix, Leptadenia, Capparis). In the stem-succulent, raingreen Adenium the green cortex is of decisive importance. In spite of the large differences within the morphological structures, all types shown a noteworthy stability and quantity of the water and photosynthesis turn-over, which is rent possible by an accurate regulation of the transpiration.
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