[Crown Copyright Reserved. | 
ROYAL BOTANIC GARDENS, KEW. 
BULLETIN 
OF 
MISCELLANEOUS INFORMATION. 
No. 7] [1923 
XXI.—CONTRIBUTIONS TOWARDS A PHYLOGENETIC 
CLASSIFICATION OF FLOWERING PLANTS. _II.* 
J. HuTcHINSON. 
THE GENERA OF ANONACEAE. 
In common with many other natural families of flowering 
plants, such as Cruciferae, Umbelliferae, Papilionaceae, etc., the 
family Anonaceae contains a certain number of purely artificial 
genera separated on very slender characters, so that theories 
based on their probable phylogeny and phytogeographical 
distribution should be deduced with considerable caution. And 
in such families there is much scope for the individual botanist to 
exercise his own particular views as to the best definition and 
disposition of the groups and genera. During the last hundred 
years the family Anonaceae has received the attention of many 
systematists, prominent amongst them being Baillont, Kingt 
and Engler & Diels§ whilst R. E. Fries and W. E. Safford have 
independently done some admirable work on certain Tropical 
American groups, and a revised key to the African genera has 
also recently been published||. In spite of the considerable 
amount of taxonomic work on the family, however, no classifica- 
tion has as yet very satisfactorily resolved the genera into tribes, 
and several of the genera remain rather ill-defined. The present 
account should therefore be regarded as tentative. A future 
monographer would probably find it necessary to reduce con- 
siderably the number of genera, of which there are no less than 
ninety-five in the present enumeration. In the past, perhaps 
too much stress has been laid on the shape and size of the anther 
* Continued from K. B., 1923, p. 89. 
+ Baillon, ‘‘ Mémoire sur la fam. des Anonac.,” Adansonia 8: 162-184 
295-344 (1867). 
! King, ‘‘ The Anonaceae of British India,” Ann. Bot. Gard. Calcutta, 
, 4: 1-169, pl. 1-220 (1893). 
M, § Engler & Diels, Monogr. Afr. Anonac. 1-96, pl, 1-xxx (1901). 
\ || Sprague & Hutchinson in Kew Bull. 1916, 145. 
z (78)20089 Wt396—P 32 1000 7/23 A 
