Vlll 



EDITOR'S PREFACE. 



' Vegetable Kingdom,' though widely differing from them ; they more nearly 

 approach the ' groups ' of Asa Gray's ' Introduction to Botany,' and are 

 identical with the * cohorts 'of Mr. Bentham's and my ' Genera Plantarum ' 

 in so far as these have been published, namely, to the end of Polypctalce. 

 The remaining Dicotyledonous Orders are grouped approximately by Mr. 

 Bentham and myself, and are subject to rectification as we advance with our 

 analyses of the genera for that work ; for it must be borne in mind that 

 no Natural Order or higher group can be accurately limited till all the genera 

 belonging to itself and its allied groups have been thoroughly investigated, 

 compared, and contrasted. For the grouping of the Monocotyledons I am 

 alone responsible. 



The next considerable deviation from the original consists in the intro- 

 duction of various omitted Orders, and of much additional matter under the 

 others, especially the tribes, sub-tribes, etc., of the large Orders, and in the 

 increased numbers of genera (the selection of which is necessarily to some 

 extent arbitrary) which have been cited. This will render the English 

 edition more useful to voyagers and travellers, and to dweHers in America, 

 India and the Colonies, whose requirements in this respect have been 

 especially regarded. 



The twenty-four Orders omitted in the original, and supplied here, are 

 chiefly small ones ; but some, as xx., xxxiv., LVII., LXXIV., xcn., CLXVII., and 

 ccxxi., are either of considerable extent, or of importance under other points 

 of view. They are as follow : 



CLXXXIX. HERNANDIE^E. 

 CCIV. PENJJACE^E. 

 CCV. GEISSOLOME^E. 



XX. CANELLACE^E. 



XXIV. VOCHYSIACEJS. 



XXXIV. DlPTEROCARPEJ-J. 



XXXV. ClILuENACE^E. 



LVII. BURSERACE^E. 



LIX. CHAILLETIACEJS. 



LXV. STACKHOUSIEJS. 



LXXII. SABIACE^E. 



LXXIV. CONNARACE.E. 



XCII. RllIZOPHOREJi. 



Oil. SAMYDACE.E. 



CX. FICOIDE^E. 



CLXVII. CRESCENTIE.-E. 



CCVI. LACISTEMACE^;. 



CCXV. GRUBBIACE^E. 



CCXXI. PoDOSTEMACEJi. 

 MONOCOTYLEDONS. 



VII. APOSTASIACEJ3. 



XVI. TRIURIDE.E. 



XLII. ROXBURGHIACE^E. 



XLV. RAPATEE.E. 



XLIX. MAYACE^E. 



