32 The Ohio Naturalist. [Vol. IV, No. 2, 



The wild variety of Helianthns anninis still appears to the 

 writer to be ///c nutating plant. For on certain cloudy days when 

 nutation is very slight in such plants as H. maxiniiliani and Am- 

 brosia trifida it is still very decided in this species. 



Occasionall}' there are days in which all the factors favorable to 

 nutation are at a maximum. Such days may be distinguished as 

 special " nutation days." One of the most remarkable in the 

 writer's experience was August 5, 1903. The ground was moist 

 but the sky was exceedingly clear. The sunlight was very 

 intense during the entire da}-. Toward evening all the nutating 

 plants in the fields and roadsides presented an appearance not 

 soon to be forgotten. The various sunflowers, ragweeds, and 

 amaranths were all nodding to the west at an angle of 90°, giving 

 to the landscape a ver}' peculiar and even unnatural appearance. 



In the account given above, fifteen species of nutating plants 

 are named. There are probably scores of others in the United 

 States which show a diurnal bending or nutation of the stem to a 

 greater or less extent. 



1. ScHAFFNER, JOHN H. Observations on the Nutation of Helianthns 



annuns. Bot. Gaz. 25 : 395-403. 1898. 



2. Kkllerm.'\n, W. a. Observations on the Nutation of Sunflowers. 



Trans. Kan. Acad. Sci. 12 : 140-158. 1889-90. 



3. SCHAFFNER, John H. The Nutation of Helianthus. Bot. Gaz. 29 : 



197-200. 1900. 



4. Stevens, F. L. Nutation in Bidens and Other Genera. Bot. Gaz. 35 : 



363-366. 1903. 



POISONOUS AND OTHER INJURIOUS PLANTS OF 



OHIO. 



John H. Schaffner. 



(Continued from p. 19.) 



62. Urtica urens L. Small Nettle. Produces irritation of the 



skin. A severe case of poi.soning is reported, caused by 

 drinking a hot infusion of this plant. 



63. Urticastrum divaricatum (L.) Ktz. Wood Nettle. (La- 



portea canadensis Gaud.) Injurious to the touch. 



64. Phoradendron flavescens ( Ph. ) Nutt. American Mi.stletoe. 



Berries jjoisonous when eaten b}- children. 



65. Rumex acetosella h. Sheep Sorrel. Seeds said to poison 



horses and sheep. Leaves, when eaten in large quanti- 

 ties, are poisonous. 



66. Fagopyrum fagopyrum (L.) Karst. Buckwheat. Causes 



the formation of a rash on some persons, when eaten. 

 Buckwheat straw is considered injurious. 



