PREFACE. VU 



Since the publication of the " Flora of Middlesex," 

 seventeen new plants have been added to the Harrow 

 Flora. Thirteen of these have been contributed by the 

 Editor, of which Pyrola minor, L., Juncus diffusus, 

 Hoppe, and Cystopteris fragilis are new to the county. 

 W. A. Tooke, Esq., has added Helianthemum vulgar e, 

 GsBrtn., and Habenaria viridis, R. Br. both to the local 

 and county Flora. The Rev. E. Brewer has fortunately 

 rediscovered Litorella lacustris, L., and so restored to the 

 county a plant supposed to have been lost. Mr. Gunn 

 and others have added to our knowledge of already re- 

 corded plants, by the mention of new sites. The Editor 

 returns his grateful acknowledgments to all who have 

 assisted in bringing the knowledge of the local Flora to 

 its present advanced state. 



The district comprised in this Flora is slightly within 

 the limits of the map, except on the north-east, where it 

 somewhat exceeds the boundaries of the map, so as to take 

 in the whole of Harrow Weald and Stanmore Parishes. 

 The county boundary is the northern limit of the district. 

 A few plants occurring between this limit and the Colne 

 are given in an Appendix. 



The Preface to the First Edition, written by the Rev. 

 Dr. Farrar, is given in part only, the last clause being 

 inapplicable to this present Edition. 



Lists of the ascertained Charse, Mosses and Liverworts 

 of the Harrow district have been inserted. Sufficient 

 attention has not been given to the Lichens and Fungi to 

 make it desirable to set down those that are known ; as 

 meagre lists would necessarily be disappointing to all who 

 might desire information with respect to them. 



It has been a source of much personal regret to the 



