304 MANUAL OF AMERICAN GRAPE-GROWING 



and character of the pubescence. Shoots may be glabrous, 

 pubescent or hairy and even spiny. 



The tendril is one of the organs most used in determining 

 species and varieties of grapes. In some species, as F. Labrusca, 

 there is a tendril or an inflorescence opposite nearly every leaf, 

 continuous tendrils. All other species have two leaves with a 

 tendril opposite each and a third leaf without a tendril, inter- 

 mittent tendrils. To study this organ it is necessary to have 

 vigorous, healthy, typical canes. Tendrils may be long or 

 short, stout or slender ; simple, bifurcated or trifurcated ; or 

 smooth, pubescent or warty. 



The number of inflorescences borne by species is an impor- 

 tant character in some cases. All species, excepting F. Labrusca, 

 average two inflorescences to a cane, but F. Labrusca may 

 bear from three to six inflorescences, each in the place of a 

 tendril opposite the leaf. 



The bud. 



Bud: An undeveloped shoot. 



Fruit-bud: A bud in which a shoot bearing flowers originates. 

 Wood-bud: A bud in which a shoot bearing only leaves originates. 

 Latent bud: A bud which remains dormant for one or more seasons. 

 Adventitious bud: A bud arising elsewhere than the normal position 

 at a node. 



Eye: A compound bud. 



Main bud: The central bud of an eye. 



Secondary bud: The lateral bud of an eye. 



Buds of different species of grapes vary greatly in time of 

 opening as they do somewhat in varieties, so that the time the 

 buds begin to swell is a fine mark of distinction. The angle at 

 which the bud stands out from the branch is of some value in 

 determining species. Differences in color, size, shape, position 

 and amount of pubescence of buds must all be noted in describ- 

 ing grapes. The scales of the buds vary more or less in size 

 and in thickness. 



