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. 
