PREFACE vii 



of the late Mr. C. B. Clarke and of the Rev. G. Kiikenthal. The 

 Araceae have been largely identified by Dr. A. Engler, and the 

 Dioscoreaceae by Sir David Prain and Mr. I. H. Burkill. The 

 Piperaceae have largely been identified by the late Dr. C. de Can- 

 dolle. Dr. L. Diels has named many of the Menispermaceae. 

 Dr. J. Perkins in addition to her general work on earlier collec- 

 tions in various families has identified many of the Monimiaceae. 

 The late Mr. 0. Focke has named or examined many of the 

 Rubus specimens. Practically all of the Sapindaceae have been 

 named or examined by Dr. L. Radlkofer. The Impatiens mate- 

 rial was named by the late Sir J. D. Hooker. Many of the Sym- 

 plocaceae were determined by Dr. A. Brand. Dr. R. Schlechter 

 has identified or examined most of the species of Asclepiadaceae, 

 Dr. F. Kranzlin accomplished considerable work on the Ges- 

 neriaceae. The late Mr. C. B. Clarke identified numerous 

 representatives of the Acanthaceae. Numerous individual iden- 

 tifications and comparisons with type material have been made 

 by other botanists in various European countries, the United 

 States, Japan, Java, Singapore, India, and Australia. 



