NUMBERS OF SPECIES IN DIFFERENT ZONES. 333 



Families. 



LX. Polemoniace-s: 

 Polemonium 

 Phlox --- 

 Collomia 



LXI. Diapensiack^e 

 Diapensia 



LXII. CONVOLVULACE^E 



Convolvulus 



Calystegia 



Cuscuta 



LXIII. HyDROPHYI.LEJE - 



Hydrophyllum - 

 Eutoca - 



LXIV. Boragine^e 

 Myosotis 

 Echinospermum 

 Lithospermum - 

 Onosmodium - 

 Echium 



LXV. Solaneve 

 Solanum 

 Datura - 

 Nicandra 

 Nicotiana 

 Physalis 



LXVI. Orobanche^e 

 Orobanche 

 Conophilus 

 Epiphegus 



LXVII. Acanthace^eI 

 Dipteracanthus 

 Dianthera 



LXVIII. ScROPHULARINE^E 



Verbascum 



Linaria 



Collinsia 



First Zone. 



Between Lat. 



45° to 55° on 

 E. side, and 

 Lat. 49° to 

 58° W. side. 



Second Zone. 

 From Arctic 

 Circle north- 

 wards to 



72° N. 



'J 7 



'_"_' 



'JO 



10 



IS 



Third or 

 Polar Zone. 

 Lying N. of 



73° Lat. 



14 



