COMPARATIVE ANATOMY OF THE CUCU RBITACE.E. 17 



at all. Tlie hypocotyls of Melothria jajwnica, Cucumis sativus^ 

 C. Jlelo, Benincasa cerifera, Lagenaria vulgaris, and Cucurbita 

 Fcpo, are hairy ; those of Actinostemma racemosum, Momordica 

 Cliaranlia, Luffa cylindrica, L. acutangida, and Ciirullus vulgaris, 

 are nearly smooth ; those of Trichosardlies cucumeroides, T. 

 jnponica, T. nndtdoha and Gyninoslcmma cissoides, are entirely 

 naked. The trielionies on the hypocotyl may he divided into the 

 same fonr classes as those on the stem. 



('ofl( iifhfjniff. In all species the eollenchyma is developed 

 so as tu entirely snrrouiid the hypocotyl without interruption. 



Sclerenelif/ma. The sclerenchyma of the hypocotyl presents 

 a eharaeteri.stie arrangement: it forms a small mass on the outside 

 of each fil )ro- vascular bundle, 



Fihro-rasculfir Btiiidles. The lunnber of the fibro-vascular 

 l)undles in the hypocotyl is generally smaller than that in the 

 stem. The typical nund)er is six, a median and two angular 

 bundles^^ being symmetrically situated opposite each cotyledon. 

 Exceptions are however found in Ciirullus vulgaris and Cucurbita 

 Pepo, the former of which has twelve bundles, while the latter 

 has ten. 



]) H. A. LoTAR. he. cit. p. 14. 



