CONTENTS. 



Page. 



Introductory statement 1 



Inventory 6 



[ndex of common and scientific names 91 



ILLUSTRATIONS. 



Page. 



Plate I. The abo, an African anona. (Annona senegalensis Pers.; S.P.I. 



No. 49843) 12 



II. A beautiful Australian vine for pergolas. (Cissns hypoglauca A. 



Gray; S. P. I. No. 49871) 12 



III. The manketti tree of the Belgian Kongo. (Ricinodendron rau- 



tanenii Schinz; S. P. I. No. 50029) 30 



IV. Natal grass as it grows on the shores of Lake Tanganyika. ( Tri- 



cholaena rosea Nees; S. P. I. No. 50038) 30 



III 



