66 EXPLANATIONS OF THE FORMULA. 



8. Viatical. — Plants of road-sides, rubbish heaps, and fre- 



quented places. Examples : Urtica dioi- 

 ca, Lamium album, Chenopodimn oli- 

 dum, Rumex pulcher. 



9. Agi-estal. — Plants of cultivated groimd. Examples : 



Papaver, Agi'ostemma, Bromus secalinus, 

 Veronica agrestis. 



10. Glareal. — Plaijts of diy exposed gi-ound, chiefly on 



gi'avel or sand. Examples : Trifolium 

 arvense, Omithopus, Hypochseris glabra, 

 Sedum acre. 



11. Rupestral. — Plants of walls and rocks. Examples: 



Saxifraga tridactylites. Cotyledon, Ara- 

 bis hirsuta, Asplenium Ruta-mm'aria. 



12. Septal. — Plants of hedge-banks and hedge-rows. 



Examples : Stellaria holostea, Hyperi- 

 cum perforatum, Bryonia, Tamus. 



13. Sylvestral. — Plants of woods and shaded places. 

 ^ />/: ^^^ Jt.^/ Examples: Bunium flexuosum, Lysima- 



' chia nemorum, Paris, Monotropa. 



14. Littoral. — Plants of the sea-shores. Examples: 



Convohiilus Soldanella, Steenhammera, 



Statice, AiTQeria. 

 In one or other of the gioups, indicated by these terms, 

 almost all our native and naturalised plants may be classed. 

 Many species, however, are so little special in their choice 

 of situation, that two or three of these terms might be al- 

 most equally well applied to them. And on the other side, 

 some few are so peculiar in their local adaptations, that 

 they do not very exactly come under any of the terms. In 

 selecting the series of terms or groups, it has been endea- 

 voured to keep a middle course ; neither making them so 

 nmnerous that several must be applied to the same species, 

 nor so few that the exceptional species themselves become 



