345 



SUMMAET. 



I. The 859 species may be thus classified : — 



Native ......... 768 



Introduced, and more or less completely naturalised, marked with an 

 asterisk (*) In the Flora . . . . . . . 91 



Total . . . .859 



There are also about 120 other species mentioned which have been met with 

 as casuals, garden escapes, or accidental introductions ; but these are omitted 

 in all the following summaries and comparisons. 



II. No less than 68 species are probably extinct. This indicates that 

 many localities have been destroyed. The same thing is illustrated by the 

 very large proportion of ' rare ' species ; though this may be lessened by 

 further investigation. The plants of Middlesex, when arranged in accord- 

 ance vdth their relative frequency (see p. 2), give this result : — 



. 129 1 



. 126 [ 377 

 .122) 



Very common . 

 Common 

 Bather common 

 Eather rare 

 Eare 

 Very rare 



Extinct 



Total 



132 N 

 109 [424 



133 J 



801 



58 



859 



The probably extinct species are these : — 



233. Lythrum Hysaopifolia. 



250. Hemiaria glabra. 



251. hirsuta. 

 258. Cotyledon Umbilicus. 

 267. Cicuta virosa. 



281. Bupleurum rotundifolium. 



295. TordyUum maximum. 



319. Galium anghcum. 



325. Centranthus Calcitrapa. 



393. Amoseris pusilla. 



403. Lactuca saligua. 



411. Sonchus palustrig. 



420. Xanthium strumarium. 



426. Campanula Eapimculus. 



440. Geutiaua Fueumonanthe. 



* StiU exists (see Addenda). 



