RESISTANT VINES; THEIR SELECTION, ADAPTATION, ETC. 27 



leaves. One should rigorously reject and destroy all varieties having pale 

 green or yellowish, thin leaves. As is the case with the use of all 

 inferior varieties, one courts certain financial loss if such varieties are 

 tried. The selection of only the very strongest growers is perhaps more 

 necessary for the Rupestris than is the case with the Riparia. 



The Vitis Rupestris is divided into two main groups, classed accord- 

 ing to the characters of the leaves. The first group comprises all those 

 varieties whose leaves are quite (comparatively) small; their manner 

 of growth is generally more bushy than those of the other groups. 



This first grand division may be subdivided into: 



(1) Varieties that are very bushy growers, with very numerous 

 secondary and tertiary ramifications. The main branches are relatively 

 short. The leaves are very much folded together, with parallel edges 

 almost touching, so situated as to resemble tiles on a roof. They are 

 frequently dull colored on the superior surface and of a yellowish- 

 green on the inferior surface. These forms are not vigorous, and the 

 leaves are apt to fall, becoming honeycombed, with small black spots 

 (melanose) . As a general rule, this form should be rejected. 



(2) A group of Rupestris which embraces the most vigorous forms, 

 with very large trunks, and principal canes that are less trailing, but 

 with strong and numerous secondary ramifications. The leaves of this 

 group are of medium dimensions in ordinary fertile soils, and are shiny 

 on each surface. Among the best known varieties of this group we may 

 mention the Rupestris Mission, Rupestris du Lot, Rupestris Ganzin, etc. 



The second grand 'division comprises all the large-leaved Rupestris; 

 larger leaved than those of the preceding group when grown on the 

 same kind of soil. They are of bushy growth, and the ramifications 

 are less numerous than those of the preceding. The leaves, while folded 

 together, are more open than in the first grand division. Most all of 

 the Rupestris of this group are very vigorous and large wooded, and 

 are subdivided into: 



(1) Large, thick-leaved varieties, with the superior surface of a quite 

 deep green color and wrinkled. Example: Rupestris Metallica, Violet- 

 leaved Rupestris, etc. 



(2) Varieties with large, fleshy, shiny leaves, whose edges are quite 

 open, and whose surface is sometimes quite wrinkled between the prin- 

 cipal and secondary nerves. Example: Rupestris Ecole, Rupestris 

 Fort Worth, etc. 



(3) Varieties that have very large, fleshy, almost flat leaves, which 

 are almost as wide as long. These kinds do not grow as bushy as the 

 preceding groups, and would certainly seem to be hybrids of some kind 

 with other species. They are commonly considered, however, as pure 

 Rupestris. Examples: Kansas Rupestris, Rupestris No. 62 of Jaeger's 

 catalogue, etc. 



Prof. Pierre Viala, of the Institut Agronomique of France, from whose 

 lectures and most valuable book on "Adaptation " we have taken much 

 that is valuable in this bulletin, has given the following resisting power 

 to the better known Rupestris varieties: (The maximum perfection 

 is 20.) 



Resistance. 



Rupestris Mission 18 



Rupestris du Lot _ _ _ . 16 



Rupestris Ganzin 18 



Rupestris Martin... 18 



The Violet-Leaved Rupestris 18 



