324 REPORT OP THE 



Sweet (Cela&rus scandens), and a delicate herbaceous vine, 

 Climbing Fumitory (Adlumia cirrhosa) seen only on Middle 

 Island of Lake Huron. 



The Floras of the various sections of the peninsula are not 

 yet sufficiently made known 'to justify any extended discussion 

 of the geographical distribution of the species. Such facts as 

 have been collected, however, foreshadow the nature of some 

 general conclusions to which even now a brief reference may 

 be made. 



A large proportion of all our species are generally distrib- 

 uted, but the northern half of the peninsula receives a very 

 considerable number of characteristic northern types. There 

 is no definite line separating the boreal types from the austral, 

 but in traveling northward we find a continual accession of 

 forms more and more exclusively northern, until in the extreme 

 northern limit of the district under consideration we find our- 

 selves for the first time within the range of such species as 

 Primula farinosa, Mimulus Jamesii, Veronica alpina, Triglochin 

 maritimum, var. datum, Calypso borealis, Tofieldia glutinosa, 

 &c. A few species in that part of the district are almost or 

 quite restricted to the White Mountains in their eastward dis- 

 tribution, while most of the others which characterize the north- 

 ern district occur also in New York and Pennsylvania, and 

 , extend southward along the Alleghanies. It is worthy of par- 

 ticular remark that many of the species of Pennsylvania and 

 New York are found in Michigan in a latitude considerably 

 higher; while, in accordance with this fact, several of the spe- 

 cies whose northern limit is in Ohio are found, further west, to 

 have extended up into Michigan. The following are examples 

 of species which, on a more easterly meridian, are not known 

 to range as far north as our State : Silene Pennsylvanica 

 (Wright), Lespedeza repens (Wright), Cercis Canadensis, Agri- 

 monia parviflora (Miss Clark), Liatris squarrosa, Rudbeckia spe- 

 ciosa, R. fulgida (Miss Clark), Vaccinium vacillans, Scutellaria 

 integrifolia (Wright), Gentiana ochroleuca (Miss Clark). A few 



