187 



Goebel, K. 1930. Organographie der Pflanzen. Part 2. Third edition. Jena. 

 Jeffrey, E. C. 1899. The development, structure, and affinities of the genus 



Eqidsetum. Mem. Boston Soc. Nat. Hist. 5: 155-190. 

 Kashyap, S. R. 1914. The structure and development of the prothallus of 



Equisetum debile Roxb. Ann. Bot. 28: 163-181. 



. 1917. Notes on Equisetum dcbilc Roxb. Ann. Bot. 31: 439-445. 



Mackel, H. G. 1924. Zur Kenntnis der spateren Entwickelungsstadien der Pro- 



thallien von Equisetum aririise. Repert. spec. nov. Beih. 28: 1-36. 

 Rumberg, J. 1931. Entwicklungsgeschichte der Prothallien von Equisetum 



silvaticum L. und Equisetum palustrc L. Planta 15: 1-42. 

 Sadebeck, R. 1881. Die Gefasskryptogamen. In Schenks Handbuch der Botanik 



1: 147-326. Breslau. 

 . 1900. Equisetaceae. In Engler, A. und Prantl, K. Die natiirlichen 



Pflanzenfamilien. First ed. I, 4 : 520-548. 

 Schratz, E. 1928. Untersuchungen iiber die Geschlechterverteilung bei Equise- 

 tum arvense. Biol. Zentralbl. 48: 617-639. 

 Smith, G. M. 1938. Cryptogamic Botany. Vol. 2. New York. 

 Walker, E. R. 1921. The gametophytes of Equisetum lacvigatum. Bot. Gaz. 



71:378-391. 

 . 1931. The gametophytes of three species of Equisetum. Bot. Gaz. 



92: 1-22. 

 . 1937. The gametophyte of Equisetum scirpoides. Amer. Jour. Bot. 



24:40-43. 



Distribution in Ontario of Dracocephalum thymiflorum ^ 



Herbert Groh 



A note by Prof. N. C. Fassett in Torreya 41 : 57. 1941, records 

 the collection of Dracocephalum thymiflorum L. in 1938 from 

 Manitoulin Island in the Province of Ontario, Canada, and refers 

 to earlier stations in Massachusetts and Idaho. 



Other Ontario records, unfortunately not published hitherto, 

 should be added to that from Manitoulin. The plants sent were 

 identified, and except the second v\^hich was returned to the Ontario 

 Agricultural College, Guelph, Ont., have been retained in the 

 herbarium of this division. They are from : Shelburne, Dufiferin 

 Co., John Leigh, June 4, 1931 ; Perth, Lanark Co., Peter Byrne, 

 June 26, 1931 ; Berwick, Stormont Co., H. W. Graham, July, 1935. 

 Mr. Graham, at the same time, had an unconfirmed report of it from 

 near Williamsburg, Dundas Co., Ont. 



^ Contribution No. 674 from the Division of Botany and Plant Pathology, 

 Science Service, Dominion Department of Agriculture, Ottawa, Canada. 



