132 Morphology BOOK i 



by Asa Gray, to whose unwearied efforts we owe much of our 

 knowledge of it. He began his labours in 1848 and con- 

 tinued them till his death in 1888. They were presented 

 to the world in his Manual of Botany, the first edition of 

 which included a Flora of the North-Eastern United States. 

 Many editions appeared as time advanced, and each 

 extended the range of vegetation under his consideration 

 till information as to the Flora of nearly the whole of the 

 United States was afforded by his work. 



The Flora of California was treated of in 1876 by Brewer 

 and Watson. Hemsley presented that of Central America 

 in his contribution to Godman and Salvin's Biologia 

 Centr ali- Americana, published 1879-88. A more special 

 work dealing with trees only was the Sylva of North America, 

 published by Sargent during the years 1891-1902. Finally 

 Britton and Brown brought out in 1896-8, the Illustrated 

 Flora of the Northern United States and Canada. 



The more careful study of the vegetation of the British 

 Isles led to the production at frequent intervals of local 

 catalogues of plants. This was no new feature, as many 

 such works were in existence long before 1860. Nor was 

 their importance great from the point of view of geo- 

 graphical distribution and its causes, which had been very 

 prominent in the ' larger works. Attention should be 

 called to Watson's Cybele Britannica published in 1870 and 

 to his Topographical Botany of 1873. Of the local Floras 

 appearing from 1860 onwards, the chief were those of Kent 

 by Hanbury and Marshall, Middlesex by Trimen and 

 Dyer, Wiltshire by Preston, Oxfordshire by Druce, Ply- 

 mouth and district by Archer Briggs, Berkshire by Druce, 

 Somersetshire by R. P. Murray, Hampshire by Townsend, 

 Cheshire by Lord De Tabley, and West Yorkshire by 

 Arnold Lees. The flora of Perthshire was investigated 

 by Buchanan White ; Colang and Scully published in 1898 

 a second edition of Moore and More's Cybele Hibernica. 



