960 



C. SKOTTSBERG 



Contents. 



Foreword 793 



Botanical excursions 802 



Chapter 1. Environmental tactors 805 



Temperature and rainfall 805 



Winds 812 



Light conditions 813 



The climate of Masatierra as compared with the climate of the coast zone of 



Chile 813 



The climate of Masatierra compared to the climate of Macaronesia 819 



Soils 819 



Chapter II. The life-forms 825 



Chapter III. Morphological and biological remarks on the vascular plants 830 



The leading forest-trees 830 



Trees of secondary importance 835 



Local tree species 839 



The rosette-trees • • 841 



Tall shrubs 862 



Small shrubs 866 



Herbaceous plants 869 



The Pteridophytes 877 



Chapter IV. The vegetation 885 



Introduction 885 



The plant communities of Masatierra 886 



Remarks on the topography 886 



General distribution 887 



The summit of El Yunque 897 



The stations 898 



The forest region 898 



The grass-lands 919 



The vegetation of the sea-shore 922 



The vegetation of Santa Clara 924 



The plant communities of Masafuera 925 



Remarks on the topography 925 



General distribution 926 



The stations 933 



The forest region 933 



The vegetation above the timber-line 942 



The grass-land of the basal region 948 



The vegetation of the sea-shore 949 



Bibliography 951 



Explanation of plates 953 



Additions 959 



Printed "A 1953. 



