FLORA OF MICHIGAN. 21 



The number of biennials given in this list is remarkably small, only two, 

 and there are no annuals in it. Sixty-eight out of seventy are perennials 

 and most persistent plants weU adapted by long, deep roots and rootstocks 

 to live in poor soil which is subject to severe droughts. Most of them are 

 admirably adapted to survival after a severe fire has burned over the 

 ground and killed the tops of the plants. 



PLANTS PECULIAR TO THE PRAIRIES. 



The following plants are peculiar to the prairie region of the south- 

 western portion of the State: 



Amorpha canescens, Nutt. Lead-Plant. 



Asclepias verticillata, L. Milkweed. 



Aster sericeus, Vent. Aster. 



Baptisia leucantha, Torr. & Gray. False Indigo. 



Bouteloua racemosa, Lag. Muskit-Grass. 



Coreopsis palmata, Nutt. 



Echinaceapurpurea, Mcench. Purple Cone-flower. 



Helianthus rigidus, Desf. Sunflower. 



Phlox biftda, Beck. Phlox. 



Silphium, integrifolium, Michx. Rosin-weed. 



Silphium laciniatum, L. Compass-plant. 



Silphium perfoliatum, L. Cup-plant. 



Silphium terebinthinaceum, L. Prairie Dock. 



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

 STATE IN THE LATITUDE OF 4440 . 



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 variable than it is on the east side of the State. So far as 

 observed, the plants of the State which are only found in the vicinity of 

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



A. NORTHERN PL, ANTS FOUND ON THE EAST SIDE OF THE STATE AND NOT ON THE 



WEST. 



Botrychium Lunaria, Swartz. Moon wort. 

 Botrychium simplex, Hitchcock. Moonwort. 

 Carex Backii, Boot. Sedge. 

 Carex capillaris, L. Sedge. 

 Carex Houghtonii, Torr. Sedge. 

 Dracocephalum parviflorum, Nutt. Dragon-Head. 

 Kalmia augustifolia, L. Sheep Laurel. Lambkill. 

 Kalmia glauca, Ait. Swamp Laurel. Pale Laurel. 

 Picea alba. Link. White Spruce. 

 Ribes lacustre, Poir. Swamp Gooseberry. 

 Sparganium simplex, Huds. 



B. SOUTHERN PLANTS FOUND ON THE WEST SIDE OP THE STATE AND NOT ON THE 



EAST. 



Adiantum pedatum, L. Maiden Hair Fern. 

 Acer dasycarpum, Ehrh. Silver Maple. 

 Rubus occidentalism L. Black .Raspberry. 

 Sambucus Canadensis, L. Common Elder. 

 Sassafras officinale, Nees. Sassafras. 

 Ulmus fulva, Michx. Red Elm. 

 Ulmus racemosa, Thomas. Rock Elm. 



This list is doubtless incomplete, but so far as it goes it sustains tfae pre- 

 vailing notion that the west side of the State has the milder climate. We 

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



