INTRODUCTION TO THE FLORA. 241 



3. Scottish type. — Species which, in a manner contrary to 

 those which make up the last type, have their head-quarters in 

 Scotland or the North of England, and become rare and finally 

 cease altogether southward. 



4. Highlajid type. — The boreal flora in a more intense degree. 

 Species Avhich have their head-quarters amongst the Scotch 

 Highlands, and are only found southward in the vicinity of 

 elevated mountains. 



5. Germafik type. — Species v.^hich have their head-quarters in 

 the south-east of England, and run out northward and westward. 



6. Atlantic type. — Species which have their head-quarters in 

 the south-west of England, and run out northward and eastward. 



7. Intermediate type. — Species which have their head-quarters 

 in the south of Scotland and the north of England, and run out 

 both northward and southward. 



8. Local type. — Species too much restricted in their range to 

 take rank under any of the types which have been defined. 



Next follows the category of citizenship to which, so far 

 as North Yorkshire is concerned, the species seems to me 

 properly to belong, Native, Coloni,st, Denizen, Alien or Incognit, 

 as the case may be. The Alien plants of the Middlesbrough 

 ballast-hills are given by themselves in a list at the end of the 

 enumeration of the Flowering Plants. 



If, as regards its distribution within our limits, the species 

 belongs to any of the three geographical categories the plants of 

 which stand out, geographically speaking, in most prominent 

 relief from the general mass of the vegetation, the word Montane, 

 Xerophilous, Subxerophilous, Maritime or Submaritime next 

 follows. 



The next item in most of the paragraphs is intended to show 

 the horizontal distribution of the species, so far as this can l)c 

 done by means of the drainage-districts which have been defined. 

 If the 'Area' is given as 'general' the species is either reported 

 to me upon good authority or has been seen Ijy myself in all the 

 nine drainage-districts. Upwards of one in three of the Native, 



I5ot. Trans. V.N.U., Vol. 3. Q 



