NUMBER OF SPECIES. XXV 



on the western side of Staddon Barrow, due south, on the eastern side of 

 Cadleigh, Worthill, and Westlake, to Holbeton village, thence to follow 

 the road to Revelstoke, and pass to the coast immediately east of Lamb- 

 side. The entire watershed of the Yealm forms this District. The species 

 only foimd in it are : 



Hypericum hirsutum. 



Geranium phceum. 



Polygonatum multiflorum. 



Scilla autumnalis. 



Carex punctata. 

 %>aludosa. 



Cystopteris fragUis. 



Chara foetida. 



VI. Erme District. — The boimdaries are, north, the line of limit ; 

 west, the east of District v. ; south, the waters of the Channel forming 

 Bigbury Bay ; east, the Ime of limit in that du'ection. Almost all the 

 watershed of the Erme is included in this District. About its estuary 

 there are sand-banks and sandy clifTs on which some interestmg plants 

 occur. The species limited to this District are : 



Ranunculus circinnatus. 

 Carex Boenninghauseniana. 

 Psamma arenaria. 

 Calamagrostis Epigeios. 



NUMBER OF SPECIES, TYPES OF DISTRIBUTION, &c. 



Of the 1 680 species named in the London Catalogue of British Plants, 

 873 belong to Plymouth,* Four additional to these will be found num- 

 bered »nd given in the Flora. They are Ruhus ramosus, R. hirtifolius, 

 R. mutabilis, and Rumex rupestris. The last is a recent addition to the 

 British list, and the Ruhi are inserted for reasons that will appear on 

 referring to the respective notices of them. These four plants bring up 

 the number of Plymouth species to 877. Two species of the London 

 Catalogue, Polygala oxyptera and P. depressa, are united with P. 

 vulgaris. Taking this mto consideration the actual number of plants 

 common to the Plymouth and British lists is 875. Three firmly established 

 introductions, Geranium striatum^ Petasites fragrans, and Linaria 

 supina, appear in the Flora, with full particulars ; but, as they are 

 among the " Excluded Species " of the London Catalogue, they are not 

 numbered, and of course do not enter into this summary. For a like 

 reason Valeria'nella eriocarpa is excluded in the calculations, though 



* This is inclusive of Myriopht/llum alternifoUum, D. C, given in the Addenda, p. 398. 



C 



