GLOSSARY. 195 



Tomentum. Woolly pubescence. 



Toothed. With the margin cut in, but not deeply enough for 



lobing, as applied to leaves. 



Torulose. Constricted between swollen parts (fruit of radish). 

 Tracheae. The same as ducts. 

 Tracheides. Short wood-cells, replacing ducts or tracheae in 



conifers as water channels : characteristically marked by 



microscopic bordered pits, spiral thickening, etc., like the 



ducts. 



Trailing. With elongated stems spreading on the ground. 

 Translucent. The same as pellucid. 



Trifoliolate. Of three leaflets, as applied to compound leaves. 

 Triple-nerved. With three palmate nerves, or with two strong 



branches from the lower part of the midrib. 

 Truncate. Cut off rather abruptly, as applied to base or apex 



of a leaf. 



Trunk. The main stem of a tree. 

 Tuberculate. Warty with rounded prominences (twigs of elder 



etc.). 

 Tubular. Cylindrical, without a spreading border, as applied to 



calyx or corolla : here used rather loosely. 

 Turbinate. Top-shaped or inversely conical. 

 Twigs. The finer or finest branches of a stem. 

 Twining. Coiling about a support like the stem of morning- 

 glory : some tendrils also twine about supports. 

 Twinned fruits. Formed from connate ovaries surmounted by 



separate calyxes and corollas (partridge berry). 

 Twinned hairs. Characteristic hairs of dogwood ; a simple 



form of stellate pubescence with only two rays, in a straight 



line. 

 Umbel. A flat- or round-topped flower-cluster with the stalks 



rising from one point, as in the carrot. 

 Unarmed. With neither spines nor prickles. Some Herbs and 



tropical woody plants (nettles) are protected by stinging 



hairs. 



