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 marylandica. 
Cassia chamaecrista. 
Acuan illinoensis. 
Prunus avium. 
Amygdalus persica. 
Tecoiua radicans. 
Riciiius communis. 
Viburnum opulus. 
Some of the foliar glands are also visited by bees and may thus 
be important in the production of honey, as the large nectariferous 
glands on the leaves of Catalpa. 
Extra-floral nectaries make an interesting object lesson well 
suited for advanced nature study and for elementary botany. 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 easih’. In winter one may readily obtain 
material for study by sprouting sweet potatoes (Iponioea batatas) 
in a dish with moist .sphagum and sawdust. The large foliar 
glands of the first 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. 
2 . 
3 - 
4- 
5 - 
6 . 
7- 
8. 
9 - 
10. 
11. 
12 . 
13 - 
14. 
15 - 
16. 
' 7 - 
15. 
19 - 
20. 
21 . 
22. 
23 - 
24 - 
25 - 
26. 
27. 
28. 
29. 
30. 
3f- 
32. 
Pteridium aquiliuum, 7. 
Potamogetoii hillii, ii. 
“ obtusifolius, II. 
“ friesii, ii. 
“ pusillus, II. 
Sporobolus heterolepis, lo. 
Populus lieterophylla, i. 
“ candicaus, i. 
“ t)al.samifera, i. 
“ dilatata, i. 
“ delloides, i. 
“ grandidentata, i. 
“ tremuloides, i. 
Salix nigra, i. 
“ amygdaloides, i. 
“ lucida, I. 
“ fragilis, i. 
“ alba, I. 
“ babylonica, i. 
Crataegu.s coccinea, i . 
“ rotundifolia, i. 
“ macrantha, i. 
Prunus armeniaca, i. 
“ americana, i. 
“ pumila, I. 
“ cerasus, i. 
“ avium, i. 
“ pennsylvanica, i. 
“ mahaleb, i. 
“ virginiana, i. 
“ serotina, i. 
Amygdalus persica, i. 
33. Acuan illinoensis, 6. 
34. Cassia nictitans, 5. 
35. “ chamaecrista, 5. 
36. “ marylandica, 5. 
37. Vicia saliva, 9 
38. “ angustifolia, 9. 
39. Vigna sinensis, 10. 
40. Ailanthus glandulosa, 2. 
41. Acalypha ostraefolia, 3(?). 
42. “ virginica, 3(?). 
43. “ gracilens, 30 ). 
44. Ricinus communis, 5, 10. 
45. Pluporbia dentata, 9. 
46. Impatiens biflora, i. 
47. “ aurea, i. 
48. Circaea lutetiana, 9. 
49. “ alpina, 9 
50. Asclepias incarnata, 3. 
51. “ sullivanlii, 3. 
52. “ amplexicaulis, 3. 
53. “ variegata, 3. 
54. “ syriaca, 3. 
55. Ipomoea batatas, 7. 
56. Tecoma radicans, 4, 10. 
57. Catalpa catalpa, 7. 
58. “ speciosa, 7. 
59. Sambucus canadensis, 8, 9. 
60. “ pubens, 8; 9. 
61. Viburnum opulus, i, 9. 
62. ■' lentago, i. 
63. \'iburnum prunifolium, i. 
