CEPAGES. 45 



the insect has never been observed on its roots, either 

 in France or America; its resistance may therefore be 

 expressed by 19.5. Cryptogamic diseases (Oi'dium, Mildew, 

 Black Rot) are rare and without action on its leaves or 

 fruit; its roots are not affected by stagnant or brackish 

 water, nor by pourridte.* 



This species is very difficult to grow from cuttings. The 

 success of a few grafts of V. Vinifera on it are mentioned as 

 exceptions, which may be explained by the morphological and 

 physiological similarities existing between the V. Rotundi- 

 folia and the Ampelopsis. 



On account of its adaptation to deep, rich, fresh siliceous 

 soil, to warm moist climates, and its difficulty of striking 

 from cuttings, of its slight affinity to grafting with European 

 vines, and its poor productivity, the V. Rotundifolia is a 

 valueless species for the reconstitution of vineyards; the 

 same applies to the forms derived from it. 



V. MUNSONIANA. 



The V. Munsoniana is a new species, which was only 

 introduced in France in 1887, where it succeeds even less 

 than V. Rotundifolia. It originates from the swampy dis- 

 tricts, the tropical climate, and the very fertile siliceous 

 soils of Florida. 



The few vines which were planted in 1888 at the School 

 of Agriculture, Montpellier, died two years after. This 

 species belongs to the same botanical group 

 as the V. Rotundifolia, from which it is dis- 

 tinguished by its vegetation being generally 

 more slender, by its bunches composed of a 

 great number of berries, which are small p ig . 4 ._s e ed of 

 instead of large, by its very small seeds v Munsoniana. 

 (Fig. 4); the teeth of its leaves are straight instead of being 

 convex on the sides, and are normal to the limb, instead of 

 being disposed obliquely. 



V. LABRUSCA. 



(a) Description. Stump, vigorous; habit, spreading; 

 trunk, strong; canes rugose, with numerous thick hairs; 

 tendrils continuous and opposite each leaf (Fig. 5), contrary 



* A cryptogamic disease, attacking both European and American vines and caused 

 by the development of different fungi [Deinatophora nnatrix (R Hartig), Agarwus 

 Melleus (L.), Rottef* hypogcea (Thum. and Pass.)] often taken for ordinary root 

 rot. (Trans.) 



