STATE GEOLOGIST. 325 



more strictly Atlantic coast species, also, reappear in our State, 

 mostly on a higher parallel than in their eastern habitat. Such 

 are Desmodium Icevigatum (Wright), D. slrictum (Wright), Co- 

 reopsis trichosperma (Wright), Utricularia purpurea (Wright), 

 Aonida cannabina (Wright), Bartonia tenella (Wright), Smilax 

 iamnifolia — though the appended authorities in these lists 

 show that I have not generally verified the identifications. 

 It would seem then that the isofloral lines, like the isothermal 

 ones, are, in their westward prolongation, deflected somewhat 

 toward the north, though the deflection is considerably more in 

 the former than the lat'ter. 



The following is a list of the species which have not been 

 observed south of the mouth of the Saginaw river. It cannot 

 by any means be asserted, however, that none of these occur 

 in the more southern counties, though very few, if any, will be 

 discovered as far south as Ann Arbor : 



List of Native Plants not observed south of the mouth of Saginaw 



river. 



Anemone multifida, Amelanchier Canadensis, 



Corydalis aurea, vars. botryapium & alnifolia, 



" glauca, Epilobium palustre, var. liniare, 



Sisymbrium arabidoides, Ribes lacustre, 



Turritis glabra, " prostratum, 



" stricta, Lonicera parviflora, 



JBarbarea vulgaris, " hirsuta, 



Sisymbrium canescens, " ciliata, 



Gakile Americana, Nardosmia palmata, 



Viola rotundifolia, Aster simplex, 



Hudsonia tomentosa, Solidago puberula, 



Drosera rotundifolia, " stricta, 



Geranium Robertianum, " Houghtonii, 



Acer Pennsylvanicum, Coreopsis lanceolata, 



Acer spicatum, Tanacetum Huronense, 



Rubus Nutkanus, Artemesia Canadensis, 



Pyrus Americana, " Ludoviciana. 



