168 On the Advancement of Local Botany near London. 



Af ', , (1. Petal oidcie, Nat. Ord. 16 Genera 58 Species 147 



Monocotyledons, < n , rn cc\a 



' ( 2. GlumacTu', 2 69 224 



18 



127 



371 



Found within thirty miles of London. (Flora Metropolitan.) 



fl. Dichlamydeae, Nat. Ord. 64 Genera 317 Species 683 



Dicotyledons. <{ 2. Monochlamydese, 

 |_3. Achlamydeae, 



13 

 5 



20 

 14 



72 

 49 



,. . , , i, Petaloideaj, Nat Ord. 16 



Monocotyledons, <1. „, „ 



J I Glumaceoe, 2 



82 



6 



2 



18 



351 804 



Genera 46 Species 106 



57 137 



103 



Total in Lindley's Synopsis. 

 Dicotyledons, Nat. Ord. 86 Genera 409 



Monocotyledons, 18 127 



104 



536 



Dicotyledons, 

 Monocotyledons 



Total in " Flora Metropolitana." 

 Nat. Ord. 82 Genera 351 



18 103 



100 



454 



243 



Species 1081 

 371 



1452 



Species 804 

 243 



1047 



Several papers having- been read before the Botanical Society of 

 London on the distribution of the number of species in certain loca- 

 lities within a few miles of London, the results might perhaps be in- 

 teresting to some of your readers. Mr Irvine* found 670 species 

 within two miles of Hampstead, Middlesex, and 900 within the same 

 distance of Croydon, Surrey. Dr Macintyre f found 10 genera, in- 

 cluding 23 species of ferns — 65 genera, including 136 species of Mo- 

 nocotyledons, — and 265 genera, including 542 species of Dicotyledo- 

 nous plants around Warley Common, Essex. I J have found 61 Na- 

 tural Orders, 214 genera, including 406 species in Battersea Fields, 

 Surrey — some of them of rare occurrence. 



The following tables have been drawn up from various works, in 

 order to exhibit the number of genera and species contained in some 

 of our local Floras ; the genera and species have not been reduced to 

 a common standard, but have been calculated as they appear in those 

 works. 



* Mr Irvine's paper was read, November 17, 1836. 

 ■j- Dr Macintyre's paper was read, December 15, 1836. 

 \ Paper read, January 5, 1837. 



