COMPARATIVE ANATOMY OF THE CUCUKBITACE^. 13 



The diameters of the large starch-grains stored in the stems 

 of many species are as follows : 



Gymnosiemma cissoides 0.040 mm. 



Blelothria japonica 0.025 ,, 



Trichosanihes mull'iloha 0.017 „ 



T. cucumeroides 0.017 „ 



CuGurbila Fepo O.Olö „ 



Luffa cylimlrica 0.015 „ 



L. acuta )i(jula 0.015 „ 



TricJiosanthes japonica 0.01 o ,, 



Aciinostemma racemosum 0.013 ,, 



CllruUus vulgaris 0.012 „ 



CacumU Melo 0.012 ,, 



0. sativiis 0.012 ,, 



The stems of Schizojjepon hryouiœfolius, var. japoiiicus, Mo- 

 mordica Charantia, Benineasa cerifera, and Lageiiarla vulgaris 

 contain no reserve starch-grains that are appreciable. 



Crystals of calcium oxalate are found in the old stems of 

 Momordica chai'aniia, Trichosanthes cucumeroides, Luffa cyUndrica, 

 L. acuiangula, Lagenaria vulgaris, Benineasa cerifera, Cucumis 

 sativus, 0. Melo, Schizopepon hryoniœfolius, var. japo7iicus, etc. 

 Of these 3Ioviordica Cliarantia has an abundance of the large 

 crystals displaying various forms belonging to the quadratic system. 



Hhizonies. Rhizomes occur in Melothria japonica and Gym- 

 nosiemma cissoides. In both cases, they have scales at each node 

 which, when completely developed, are three in number, and are 

 to be anatomically distinguished as a shoot, a leaf, and a tendril : 

 for, the first has ten fibro- vascular bundles; the second, five bundles 

 with a semi-circular contour ; and the third, three or four bundles 



