VOLUME XXIII, 
HELOSCIADIUM MOOREL 
BY THE REV. H. J. RIDDELSDELL. 
In the course of the enquiry prehminary to the writing 
of this paper, I have owed much to Messrs. R. Lloyd Praeger, 
Hugo Gliick, E. G. Baker, G. C. Druce, and others for help, 
advice, and information ; most of all I am grateful for the 
generous loan of herbarium collections or important sheets 
of specimens, amongst others, from the authorities at the 
Herbarium, Kew Gardens ; from the University of Cam- 
bridge, in whose possession is Babington's collection ; from 
the National Museum at Dublin, which has a good collection 
of specimens of Helosciadium^ Moorei, many of them col- 
lected by Mr. Praeger. Mr. Praeger also has put at my 
service his own fine series of the form, some fifteen sheets, 
gathered in various parts of Ireland. Mr. F. J. Hanbury's 
herbarium, containing Boswell-Syme's type specimen ; Mr. 
Druce's ; Mr. Bailey's large and useful collection ; these 
and many others have contributed material for the paper. 
To all the gentlemen mentioned and to various correspon- 
dents who have given information, or even sent living 
specimens, my grateful thanks are due. Without their 
co-operation nothing could have been done. 
^ The generic name, Helosciadium, is used here, for the sake of con- 
formity with an article written by :Mr. E. G. Baker and myself, and printed 
in the Journal of Botany, June, 1906, on forms of Helosciadium nodiflorum. 
But probably it is better to include this genus in Apium, and indeed I 
should do so if writing more widely. 
A 
