FLORA OF THE DETROIT ZOOLOGICAL TRACT. 



BY JOHN M. SUTTON. 



The Detroit Zoological Tract consists of one hundred acres of land 

 located partly in the village of Royal Oak, and extending west of the 

 village limits. The south line is a half mile long running east and west, 

 parallel to and a short distance north of the ten-mile road, as shown by 

 the accompanying map. The northeast corner touches Woodward Avenue. 

 The east line extends along Lafayette Avenue for about fifty rods. The 

 north line extends west with a curve north which makes the west end 

 of the tract about a quarter of a mile across. 



There is a stand of trees near the east end of the tract on rather low 

 land, and groves in the middle and near the west end on higher land. 

 Three ditches run south across the park which is rolling, making some 

 dry fields and some low, wet ground. Only part of the land has been 

 under cultivation and of recent years most of it has been neglected. 



At Dr. Bryant Walker's suggestion, a collection of the plants growing 

 on this tract was started in the spring of 1916, trips being made once a 

 week for this purpose. As a rule only plants observed in blossom were 

 collected, consequently the list does not represent all of the flora. Only 

 plants growing on this tract are included in this list with but one excep- 

 tion. Grindelia squarrosa (Pursh.) Dunal. is included because it was 

 found growing in quantities just over the line and is so rarely met with 

 in this part of the state. 



I wish to thank Mr. C. K. Dodge of Port Huron, and Mr. C. Billington 

 of Detroit, for examining the specimens, and Mr. Wilbur McAlpine, 

 topographer, of Birmingham, who very kindly furnished the map. 



PoLYPODiACE.E — Fcm Family. 

 Pteris aquilina L. Common Brake. 



OsMUNDACE^ — Flowering Fern Family. 



Osmunda Claytoniana L. 



Osmunda cinnamomea I^. Cinnamon P'ern. 



OpHioGLOSsACEyE- — -Adder's Tongue Family. 

 Botrychium virginianum (L.) Sw. Rattlesnake Fern. 



19th Mich, Acad. Sci. Rept., 1917. 



