GLOSSARY. 301 



Tent-caterpillars. Caterpillars that build silky-iike tents on trees 

 and other plants. 



Tliorn. A hardened sharp-pointed branch. 



Tomentose. Clothed with matted woolly hair. 



Top-worked. Said of trees that are grafted or budded at some dis- 

 tance above the ground. 



Transpiration. The process by which water is taken up by the roots 

 of plants, and given off to the air through the leaves and 

 branches. 



Tree. A perennial woody plant with a single stem which from 

 natural tendencies generally divides into two or more branches 

 at some distance from the ground. 



Tree-crown. That part of a tree that is branched, forming a head. 



Tree-digger. Ordinarinarily a plow-like implement having a shaTp 

 knife-like blade that is drawn through the soil bv a team and 

 cuts the roots off the trees at a distance from the base of the 

 tree-trunk. Where large quantities of trees are to be dug this 

 is a most important implement. There are various kinds; one 

 style cuts on both sides of the row at one time. 



Tri. Prefix meaning three. 



Turgid. Distended; applied to leaves and other parts when filled 

 with water. 



Umbel. An umbrella-like form of inflorescence, (e. g. flower clusters 

 of Caraway. Parsnip.) 



Unisexual. Bearing either male or female organs, not both, (e. g. 

 flowers of Willows.) 



Variety. A distinct and valuable variation from the original. 

 JPage 32.) 



Valve." One of the parts of a dehiscent pod. 



Valvate. Opening bv valves. 



Water capital. The entire water of the earth, 



Weed. A plant out of place, a generally troublesome plant, not of any 

 appreciable economic value. 



Whorl. Applied to leaves when arranged in a circle around the stem. 



Wings of a leaf. The expanded portion; the blade. 



Windbreak. A single row or belt of trees, which serves as a protec- 

 tion from wind. 



Wood. The hardened tissue of a stem. A forest. 



