viii FREFACE. 



known. To several English specialists we are deeply indebted for 

 labour bestowed on the identification of many difficult plants. Professor 

 C. C. Babington, F.E..S., has from time to time examined the Euhi, and 

 given his opinion on the specimens submitted. Mr. J. Backhouse took 

 the trouble of identifying the Hieracia here catalogued, and Mr. Arthur 

 Bennett, F.L.S., did the same for the Pondweeds. Many specimens of 

 CJtaracece have been diagnosed for us by the Messrs. H. and J. Groves, 

 F.L.S. The late Dr. Boswell, of Balmuto, Mr. George Nicholson of 

 Kew, and others have kindly assisted. In an especial manner our 

 thanks are due to Mr. G. A. Holt, of Manchester for the labour of criti- 

 cally examining the specimens of Musci and Hepaticce. These specimens 

 were very numerous, and many of them bearing incorrect names when 

 sent to Manchester. They have been subjected by Mr. Holt to an 

 exhaustive scrutiny, and the names, as understood by British bryolo- 

 gists, may be relied upon as correct. Some species recorded here are 

 excluded from this statement, but they stand on the credit of such very 

 competent authorities as Templeton, Moore, and Thomas Drummond. 

 It was considered desirable that the mosses now catalogued should be 

 arranged in conformity with the British Moss Flora, and to Dr. Braith- 

 waite, F.L.S. , we are indebted for kindly foreshadowing the sequence to 

 be followed in the portion of his book which is not yet published. For 

 the genus Hypmim, however, as it stands in this Flora Dr. Braithwaite 

 is not accountable. Most valuable assistance has been rendered by 

 several local Naturalists whose names appear in the lists of species. 

 Their kindness in supplying notes of localities, and in forwarding speci- 

 mens where desired was of the utmost service. For Kberty to use the 

 MS. list of Derry plants made by the late Dr. David Moore, F.L.S., we 

 are indebted to the courtesy of Mr. F. W. Moore, of Glasnevin. In 

 addition, thanks are due to Messrs. ^V. Swanston, F.G.S., "W. H. Patterson, 

 M.R.I. A., and E. M. Young, B.A., who facilitated this work by means of 

 information, advice, and the use of books from their libraries. The remarks 

 on the vertical limits of cultivation in the County of Antrim were obligingly 

 contributed by Mr. R. Glascott Symes, M.A., F.G.S., and the informa- 

 tion on this head, as regards County Down, was kindly supplied by Eev. 

 H. W. Lett, M.A., T.C.D. 



BOOKS WHICH CONTAIN REFERENCES TO PLANTS IN 

 THIS DISTRICT. 



Ray — Synopsis Stirpium Britannicarum, ed. II., London, 1696. 



In this volume are records of a few plants on the authority of Sherard, 

 the earliest botanical explorer in the north of Ireland. 

 Harris — Antient and present state of the County of Down, Dublin, 1744. 



