GLOSSARY 155 



Toothed. Having small projections along the margin like 



the teeth of a saw, as in Fig. 100. 

 Top-shaped. A somewhat globular structure which tapers 



regularly to a narrow base, like an inverted geometrical 



cone. 

 Triangular. Of the general shape of a triangle, as in 



Fig. 127. 

 Trunk. The main stem of a tree, usually restricted to 



mean the part below the crown. 

 Twice compound. With leaflets attached to the secondary 



axes of the leaf (i. e., the main axis divides before it 



bears leaflets), as in Fig. 546. 



Twig. A young shoot. Sometimes used with reference to 

 the branchlet without the leaves. 



Unsymmetrical. With the two sides unlike, as in Fig. 262. 

 Vein. One of the ribs or thickened lines in a leaf-blade. 



Wavy. Alternately concave and convex along the margin, 

 as in Fig. 46. 



Wedge-shaped (leaf). Tapering regularly from a broad 

 apex to a pointed base. A wedge-shaped base is 

 pointed (often bluntly), with the margins straight or 

 nearly so, like the sides of a wedge, as in Fig. 153. 



Whorled. With three or more leaves around the stem at 

 the same node, as in Fig. i. 



Wing. Any thin flat appendage attached to a thicker 

 main structure. 



Woolly. Covered with tangled or loosely matted hairs. 



