212 THE MICHIGAN ACADEMY OF SCIENCE. 



Polygonacece. 

 Polygonum dumetoriim Lin. is sometimes met with along fence rows. 



Chenopodiacecc. 



Corispermiim hyssopifolium Lin. is largely cultivated as an ornamental 

 lilant and is met with occasionally as an escape. 



Amaranthacece. 



Acnida tamariscina (Nutt.) Wood. var. tuberculata (Moq.) U. d B. 

 and variety concatenata [Moq.) U. d B. were collected on the shores of 

 Belle Isle during the summer of 1900. 



Ranunculacew. 



Anemone riparia Fernald, recently separated from A. Yirginiana, is 

 frequent at Detroit and Kochester. 



Crucifene. 



■ Sisymbrium altissimum Lin., a bad weed in cultivated fields, is mak- 

 ing its appearance near Palmer Park. 



Rosacece. 



Spirtea alba Du Roi. This is the S. salicifolin of the '"Flora." Accord- 

 ing to Ascherson and Graebner the S. salicifolia is European and does 

 not occur in America. 



Spiraea alba Du Roi. var. lauceolata (T. d- G.) A. d G. is frequent at 

 Detroit. 



Porteranthus trifoliatus {Lin.) Britt. Indian Physic. Fields at De- 

 troit. Pare. 



Fragaria Canadensis Mx. is frequent in fields. 



Rubus nigricans Rydh. and R. Eusleni Tratt are more or less frequent 

 at Detroit and vicinity. 



Agi-imonia striata Miv. (A. glahra (Muhl.) Bicknell) is frequent on 

 Belle Isle. 



Crataegus Oxycantha Lin., the English Haw or Hawthorn, is an occa- 

 sional escape from cultivation. 



Crataegus pruuifolium {3Iarsh.) Pers. is one of the Cokspur group of 

 thorns that is frequent on Belle Isle. It has usually been confused with 

 C. Crus-Galli. 



The C. coccinea enumerated in the "Flora" is probably C. pastorum 

 C. S. Sarg. and the C. mollis is C. sera C. S. Surg., C. altrix Ashe, and 

 C. nuperia Ashe. The C. macracantha is C. gemmosa C. S. I>>arg. 



Prunus Americana Marsh, var. nigra (Ait.) Wang, is frequent on 

 Belle Isle and the var. mollis T. d G. is occasionally seen in sparse 

 thickets. 



Prunus Mahaleb is cultivated as a shade tree and seems to have become 

 established. 



