TUSCOLA COUNTY 209 



in particular in swamps about the small lakes. "Abundant in Akron, 

 Wisner and Gilford townships." C. A. Davis. 



Syringa vulgaris L. Common lilac. Noticed as an escape from culti- 

 vation along roads. Infrequent. 



GENTIANACEAE. Gentian Family 



Gentiana crinita Froel. Fringed gentian. Noticed by Prof. C. A. 

 Davis in prairie-like ground in the northern part of Akron Townshi] 



Gentiana andrewsii Griseb. Closed gentian. Near Mud Lake and 

 North Lake. Probably frequent throughout. 



Halenia deflexa (Sm.) Griseb. Spurred gentian. In woods m 

 Mud Lake. "In swampy woods by the roadside, Fremont Township 

 three miles north of Mayville." C. A. Davis. 



Menyanthes trifoliaia L. Buckbean. In very wet places aboul the 

 small lakes. 



APOCYNACEAE. Dogbane Family 



Vinca minor L. Common periwinkle. Popularly known as myrtle. 

 Becoming a permanent escape in the village of Akron. 



Apocynum androsaemifolium L. Spreading dogbane. Frequenl in 

 dry open woods. "Sandy ridges and plains, Indianfields Township. ' 



Apocynum cannabinum L. Indian hemp. Frequent in low ground 

 near the small lakes. "Terraces of Cass River south of Caro. ?: I . A. 

 Davis. 



Apocynum cannabinum hypericifolium (Ait.) Gray. Clasping-leaved 

 dogbane. Frequent in low open ground and the more common form. 



ASCLEPIADACEAE. Milkweed Family 



Asclepias tuberosa L. Butterfly-weed. Occasional throughout in 

 dry open ground. 



Asclepias purpurascens L. Purple milkweed. "Frequent on the sandy 

 islands in the prairies of Akron and Wisner townshi; I . A. I >avis. 



Asclepias incarnata L. Swamp milkweed. Abundant throughout in 

 low damp ground. Has a strong fine fiber that may yet l" 1 made useful. 



Asclepias syriaca L. Common milkweed. On sand ridges near the 

 shore of Saginaw Bay and in dry open ground throughout. Often a 

 miserable weed in old fields and pastures. 



Asclepias sullivaniii Engelm. Sullivant's milkweed. Noticed in 

 abundance on prairie-like ground in Akron Townshi ially in the 



northern part. Perhaps the northern limit of the plant. 



Asclepias phytolaccoides Pursh. Poke milkweed. "Good soil and 

 moist places in Akron, Columbia and Fairgrove townships. ' C. A. 

 Davis. 



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