Glossary. 229 



Tuber, A prominently thickened root or stem, usually 

 subterranean. 



Umbel. A flower cluster which is flat or flattish on top, 



. and whose pedicels start from a common point, or nearly so. 



Variety-hybrid. A cross between varieties of the same 

 species ; half-breed ; cross-breed ; mongrel. 



Vegetable, i. A plant. 2. In horticultare, an edible por- 

 tion of an annual plant ; kitchen-garden vegetable. In the 

 latter sense, a loose term. 



Vegetable-gardening. The cultivation of kitchen-garden 

 vegetables ; olericulture. 



Vegetation, i. Vegetable or plant life. 2. The process 

 or act of vegetating or growing. 



Veneer-graft. A sort of grafting in which the scion is ap- 

 plied to the side of the stock, only the bark oeing removed 

 between them. 



Viticulture. Grape culture. 



Weed. A plant which grows where it is not wanted and 

 which becomes troublesome. 



Whip-graft. A species of grafting in which the scion is 

 secured to the stock by means of a tongue which Is inserted 

 in a cleft in the stock ; tongue-graft. 



Wilding. A wild or uncultivated plant. Commonly used 

 to designate the wild individuals of a cultivated species. 



Wind-shake. An injury to the trunk of a tree, consisting 

 of the more or less complete separation of Ihe concentric 

 annual layers or of the separation of the Dark from the 

 wood. The injury is commonly ascribed to the wind, but it 

 is oftener due to the frost and other causes. 



Winter-killing. The process or act by which a plant is 

 killed by the climate of winter. 



Worm. A term properly applied to a large class of legless 

 articulated animals, of which the angle-worm, or earth- 

 worm, and trichina are examples. The term is commonly, 

 but improperly, applied to the 'arvae of Insects. 



