IN AMPELOGEAPHY. 85 



Rupestris du Lot. 



VITIS RUPESTRIS.* AMERICA. 



HABIT. Very erect, the principal ramifications only 

 spreading on the ground. 



LEAVES. Very slightly folded along the mid-rib, 



margins undulating, shiny, light metallic 

 reflection, relatively thin, the square shape, 

 as it were, is broken by the tooth forming the 

 terminal lobe. 



Petiolar sinus, bracket shaped. 

 WOOD. Hazel colour, knotty, much ramified. 



The Rupestris du Lot has only male flowers. This 

 character enables it to be distinguished from certain Ru- 

 pestris which have leaves of almost the same shape, but 

 which are fertile. It never has phylloxera galls on the 

 leaves. This is the only American vine, like the European 

 vines, which completely resists the formation of galls re- 

 sulting from the puncture, by phylloxera, of the herbaceous 

 organs. The leaves on extreme ramifications are greatly 

 reduced in size. Under the influence of excessive drought, 

 the leaves of Rupestris du Lot become strongly folded 

 along the mid-rib, and lose their metallic lustre. 



* The Vitis Rupestris present the following descriptive characters : 

 HABIT. Bushy, secondary ramifications short and very numerous. 



LEAVES. Generally small, often wider than long, folded along the mid- 

 rib, parchment -like, shiny, very glabrous, never with stiff 

 hair on the ridge of veins of the under face, sub-veins trans- 

 parent, sunk in the limb. 



UPPER PORTION OF GROWING SHOOT. Terminal bud scarcely 

 completely enveloped by the young leaves. Young leaves 

 very shiny and transparent. 



BUDDING. Carmine. Young grapes protruding from young leaves, deep 

 carmine. 



WOOD. Knotty, iuternodes short. 



