CONTKIBCTIONS TO THE BOTANY OF MICHIGAN. 209 



Compositce. 



Aster maerophvlhis Lin. var. excelsior Burgess. Rocky woods in Ke- 

 weenaw connty. Frequent. 



A. niarcropbyllus Lin. var. velutinus Burgess is a less glandular form 

 of the species with the pubescens more velvety. Near Rochester, 



A. Lowrieauns Porter is frequent near Rochester. 



Antennaria neodioca Greene. Keweenaw county. 



A. Farwellii Greene. Keweenaw county; Mackinac Island. 



A. Canadensis Greene. With the last. 



Polymnia Canadensis L. var. radiata A. Gr. Rochester. 



Ambrosia psilostachya D. C, the western ragweed, was found spar- 

 ingly in Keweenaw county in August, 1902. 



Rudbeckia hirta Lin. var. pulcherrima. A form tllat differs from the 

 species only in having a part of the upper surface of the ray, or even the 

 whole upper face, brown-purple. Detroit. 



Heilanthus giganteus L. var. subtuberosus (Bourgeau) Burgess. This 

 is a form with edible tuberous roots and mostly opposite leaves. Bir- 

 mingham and Rochester. 



H. Masimillani ^^ehrad. Frequent in the Lake Superior district of 

 Michigan and has sometimes been collected on ballast at Detroit. 



Artemisia Stelleriana Bess., is an escape from cultivation. 



Senecio discoideus {Hk.) Britt. The common ragwort or squawweed 

 of the copper district. 



Taraxacum erythrospermum Andr. A form of the dandelion with 

 red-brown achenes. Detroit. Common. 



Lactuca juilchella (Ph.) D. C. This is a large blue-flowered lettuce 

 with elongated lanceolate, mainly entire, leaves. Frequent in Keweenav/ 

 county. 



ADDITIONS AND CORRECTIONS TO THE FLORA OP DETROIT. 



Polypodiacece. 



Filix spinulosa var. dilatata (Hoffm.) Pohjpodiu)n dilatatum Hoff. 

 Deutsch. Fl. 2. 7, 1795. This variety is quite frequent in the woods on 

 the upper part of Belle Isle. 



EquisetacecB. 



Equisetum arvense var. nudum (Milde) (E. arvense campestre nudum 

 Milde Denkschr. Schles, 186, 1853; E. arvense campestre macrosta- 

 cnyum A. A. Eaton Fern Bulletin 87, 1999). This is a form of the species 

 growing in moist grassy places with a perfect fruiting head and only a 

 half dozen or less scattered sterile branches about the center of the 

 fertile stem. The fertile stem is rare but the sterile is very common, 

 having the lower half unbranched; the lower part of both is reddish. 

 Belle Isle. This was listed in the "Flora" as E. pratense. 



E. arvense L. var. decumbens Meyer is a form with a prostrate sterile 

 frond growing on sand banks. 



E. arvense L. var. nemorosum A. Br. is a very large form growing in 

 shade along the borders of woods, etc., with the lower part of the sterile 

 stem generally unbranched. The branches are horizontal or ascending 

 with drooping tips. 

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