20 MICHIGAN ACADEMY OF SCIENCE. 



Silphium terebinthinaceum Jacq. Prairie Dock. 

 Tradescantia Virginica L. Common Spiderwort. 

 Utricularia resupinata B. D. Greene. Bladderwort. 



COMPARISON OF THE FLORA OF THE EASTERN AND THE WESTERN SIDES OF THE 

 STATE IN THE LATITUDE OF 44°40'. 



On the east side, the latitude in question is near Harrisville in Alcona 

 county. On the west side it is near Frankfort in Benzie county. 



It has long been known that the climate of the west shore where the 

 wind sweeps across Lake Michigan was milder in winter, and throughout 

 the year less yariable than it is on the east side of the State. So far as 

 obseryed. the plants of the State which are only found in the yicinity of 

 the great lakes are more abundant in indiyidnals on the west shore. 



A. NoRTHERx Plants Found on the East Side or the State and Not on the West. 



Botrychium Lunaria (L.) Swartz. Moonwort. 



Botrychium simplex Hitchcock. Moonwort. 



Carex capillaris 'L. Sedge. 



Carex durifolia Bailey. Back's Sedge. 



(Carex Backii Boott.) 



Carex Houghtonii Torr. Sedge. 



Dracocephalum parviflorum Nutt. Dragon-head. 



Kalmia angnstifolia L. Sheep Laurel. Lamhkill. 



Kalmia glauca Ait. Swamp Laurel. Pale Laurel. 



Picea Canadensis (Mill) B. S. P. White Spruce. 



(Picea alha Link.) 



Ribes lacustre (Pers.) Poir. Swamp Gooseberry. 



Sparganium simplex Huds. 



B. Southern Plants Found on the West Side of the State and not on the East> 



Adiantum pedatum L. Maiden Hair Fern. 

 Acer saccharinum L. Silver Maple. 

 (Acer dasycarptim Ehrh.) 

 Rubus occidentalis L. Black Raspberry. 

 Sambucus Canadensis L. Common Elder. 

 Sassafras Sassafras (L.) Karst. 

 (iSa-s-safras officinale Nees.) 

 Ulmus fulva Michx. Red Elm. 

 Ulmus racemosa Thomas. Rock Elm. 



This list is doubtless incomi>lete. but so far as it goes it sustains the pre- 

 yailing notion that the Ayest side of the State has the milder climate. We 

 might be able to see why silyer maple, sassafras, black raspberry, red elm 

 and rock elm thriye on the west shore and not on the east, but Aye are 

 unable to see why the northern plants found on the east shore should not ■ 

 be found on the west shore. I'crliaps there is some other reason than the 

 difference of climate of the y)rescnt day. 



PLANTS SUPPOSED TO HAVE IM.MIGRATED FRO.AI THE NORTHEAST. 



Calypso bulbosa (L.) Oakes. 



(Calypso borealis Salisb.) 



Clintonia borealis (Ait.) Raf. 



Equisetum littorale Kuehl. 



Eriocaulon septangulare Withering. Pipewort. 



Gyrostachys stricta Rydb. Hooded Ladies' Tresses. 



(Gyrostarhys Romanzlfiana (Cham.) MacM.) 



Selaginella selaginoides (L.) Link. 



(f,cUi(jineUa spiiwsa Beau v.) 



