APPENDIX I 



Since the system of Engler and Prantl (* Syllabus 

 der Pflanzen familien,' ed. vii, 1912) is coming into 

 somewhat greater vogue in this country, having been 

 long in use on the Continent and in America, we 

 give a summary of it here, with reference to the 

 pages where the orders are described in the three 

 volumes. The order is that of the 'Genera of British 

 Plants,' by Dr. H. G. Carter, which contains some 

 modifications made by Dr. C. E. Moss. 



The characters of the orders are taken from Engler 

 in the main ; those of the sub-orders from Dr. Carter's 

 synopsis ; those of the families from other sources. 

 It is not possible to give within the limits of space 

 allowed diagnoses of the numerous genera, of which 

 there are some five hundred in the British flora alone. 

 Reference should be made to such systematic works 

 as those of Hooker, Bentham and Hooker, Babington, 

 or other standard British works. 



For purposes of identification, the use of dicho- 

 tomous keys to orders, families, genera, etc., may 

 be recommended, such as those in Bentham and 

 Hooker's ' Handbook of the British Flora,' in which 

 also keys to species will also be found under each 

 genus. 



