io6 



The Ohio Naturalist. 



[Vol. IV, No. 5, 



During the past summer ants were found abundantly on the 

 following plants, working at the nectar and crawling over the 

 leaves and branches : 



Cassia marylaiidica. 

 Cassia chaniaecrista. 

 Acuan illinoensis. 

 Prunus avium. 



Amygdalus persica. 

 Teconia radicans. 

 Ricinus coiiimmiis. 

 Viburnum opulus. 



Some of the foliar glands are also visited by bees and ma}' thus 

 be important in the production of honey, as the large nectariferous 

 glands on the leaves of Catalpa. 



Kxtra-floral nectaries make an interesting object lesson well 

 suited for advanced nature study and for elementary botan}\ The 

 subject is no less important because the reason for the phenomenon 

 is not so very evident and because the teacher is not able to give 

 a conclusive answer so easily. In winter one ma}- readily obtain 

 material for stud}- by sprouting sweet potatoes (Ipomoea batatas) 

 in a dish with moist sphagum and sawdust. The large foliar 

 glands of the f:rst leaves secrete an abundance of nectar. 



Below is given a partial list of the native and cultivated Ohio 

 plants with glands, together with numbers referring to the eleven 

 types indicated above. 



