12 AET. 3. K. ONO. 



of Viburnum japonicum, red anthocyan is found in the surrounding 

 tissues of the nectaries, but only when tliey have become old. 



Idesia polycarpa has petiolar nectaries, of which those 

 situated at the upper part of branches, and so exposed to the 

 sun, become in consequence red ; while those borne on the lower 

 shaded leaves retain the green colour. 



The extranuptial nectaries of Vicia faha and V. sativa, 

 when they are cultivated in diffuse light, take no reddish hue, 

 and even in direct sunlight, all their younger nectaries have 

 a green colour. The green nectaries produce the same amount 

 of nectar as the red ones do, as I have proved in the case of 

 Vicia faba, Idesia polycarpa and Prunus yedoensis. So fiir as I 

 could see, ants^^ showed no preference as to the colour of the 

 nectaries, visiting the red and green ones with equal frequency. 



D. Classification of some extranuptial nectaries. 

 TJie first type, 



a. Polygonum sachalinense ; P. cuspidatum ; P. cuspidatum, 

 forma Meiyetsuso ; P. muUiflorum ; Ipoinoea Batatas. 



b. Liyustrum ciliatum ; L. medium ; L. lucidum ; Osmajithus 

 aquifolium; 0. fragrans; Syringa amurenis vsiv.jajyonica; 

 S. vulgaris; Sterculia platanifolia ; Hibiscus rosa-chinensis 



c. Hibiscus tiliaceus ; TJrena sinuata. 



d. Hiervilla grandiflora ; H. japonica ; Clerodendron 

 trichotomum ; Callicarpa japonica ; Tecoma grandiflora ; 

 Catalpa Kaempferi ; Pauloivnia tomentosa; Vicia faba; 

 V. sativa. 



1) Conf. Machiatti. Ufficio <lei peli, ileH'antocianio e dei nettarii estranuziali 

 dell' Ailanthus grandulosa. Bull, soc bot. ilal. 1899. 



