57 



Literature Cited 



1. Brandwein, P. F. 1940. Preliminary observations on the culture of Spiro- 



gyra. Amer. Journ. Bot. 21 : 161-162. 



2. Czurda, V. 1926. Die Reinkultur von Conjugaten. Arch. f. Prot. 53:215- 



242, 6 figs. 



Washington Square College, 

 New York University. 



Dracocephalum thymiflorum in Ontario 



N. C. Fassett 



Ml 



Dracocephalum iliyniiflorum L., a native of Siberia which 

 entered Finland and Sweden at a very early date and has more 

 recently spread as far as central Europe, was reported from this 

 continent some thirty years ago as a casual plant in a wool- 

 waste dump at Westford, IVIassachusetts.^ On June 30, 1938, Dr. 

 Edgar Anderson and the writer were collecting on Big Hill, the 

 highest point on Manitoulin Island in Lake Huron, and Dr. Ander- 

 son found a mint which proves to be this species. It grew in some 

 abundance along an old lumber road near the summit of the hill. 

 There is in the herbarium of the Missouri Botanical Garden a 

 single collection from the United States, from Henry Lake, Fre- 

 mont County, Idaho, July 12, 1920, Dr. E. B. Payson & Lois 

 Payson, no. 1996. 



Like D. parvifloruin this species has the ovate uppermost lobe 

 of the calyx much wider than the other four triangular lobes (see 

 fig. 892 in Gray's Manual). It differs from D. parvifloruin in having 

 its flowers in distant whorls forming slender interrupted spikes, 

 and in its narrower less conspicuously toothed leaves. 

 1 Fletcher, Rhodora 13:212. 1911. 



Department of Botany, 

 University of Wisconsin, 



