STUDIES ON SOME EXTRANUPTIAL NECTARIES. 7 



cells, which corresponds to the style cells in the extranuptial 

 nectary of Clerodendron trichotomuyn. 



b. Cassia sulfurea. 



A single nectary of a spherical form, acute at the top and 

 green in colour, is found on the rachis between the lowest leaf- 

 lets. The whole surface of the spherical body is provided with 

 several layers of secretory epithelium, and is protected by the 

 cuticle. The outermost layer of the secretory epithelium consists 

 of elongated cells of different heights, arranged somewhat regu- 

 larly. Chlorophyll is found in the secretory epithelium. Sub- 

 glandular cells are deficient. The space inside of these layers is 

 filled with the ground parenchyma and fibro-vascular bundles. 



c. Viburnum dilatatum. 



Minute nectaries are found on the underside of the leaves. 

 The cells which line the surface of each nectary are broad in 

 shape and cutinised on the outer wall. Beneath this layer, 

 there are five or six layers of small elongated cells, arranged 

 in a form radiating from the centre of the nectarine surface. 

 These cells may be regarded as the secretory cells. The fibro- 

 vascular system is connected with the base of the nectary by 

 the conducting parenchyma. The secretory cells are surrounded 

 by a number of large parenchymatous cells which have wide 

 intercellular spaces between them. 



Viburnum japonicum, V ojmhis^^ and Diospyros morissiana 

 have similarly constructed nectaries. 



1) Thouvenin. Observations sur les glandes petiolaires du Viburnum opulus. Kev. 

 gén. bot. Bd. XV, p. 98. 1903. 



