-344 Mr Kingston's Skefch of the 



can be traced, are excluded, such as the Datura, Leucojumy 

 Ali/ssinn, Calendula, (Enotliera, Chrysocoma, Carum, &c. It is 

 also necessary, in a sketch of this kind, to exclude many, that 

 though undoubtedly British, and occasionally met with in the 

 district, cannot, in a strict sense, be considered indigenous to it. 

 Such are the different species of Pirnis; for, though fragments 

 of trees, obviously referable to this genus, occur on Dartmoor 

 and elsewhere, deeply immersed in peat, and especially in the 

 remarkable formation of Bovey heath, the chief part of which 

 consists of imperfectly mineralized wood of this description, and 

 furnishes proof of the Pinus being indigenous, previous to the 

 existing state of the surface, — I do not think this circumstance 

 can affect the history of the present race. The lime, and some 

 other trees and shrubs, I also deem it necessary to exclude, in 

 the same way. With these restrictions, the following is the 

 relative distribution and number of species, belonging to each of 

 the principal natural orders. 



MONOCOTYLEDONES. 



Species. Species. 



Thus, the grasses form nearly two-thirds of their own class : 

 and, together with the composite, one-fourth of the whole of 

 our phaenogamous plants ; whilst the cruciform, leguminous, 

 umbelliferous, rosaceous, and labiated, form together one-fourth 



Species. 



35 



3 



150 



150 



