DESCRIPTIVE NOMENCLATURE. 269 



PAGE 



These three are the essential parts of a stem. 

 But besides these, it has, when largely 

 developed, a permanent form : namely, 



IV. The Trunk. — A non-advancing mass of 



collected stem, arrested at a given height 

 from the ground 155 



The stems of annual plants are either leafy, as of 

 a thistle, or bare, sustaining the flower or flower- 

 cluster at a certain height above the ground. 

 Receiving therefore these following names : — 



V. The Virga. — The leafy stem of an 



annual plant, not a grass, yet growing 

 upright 164 



VI. The Virgula. — The leafless flower-stem 



of an annual plant, not a grass, as of a 

 primrose or dandelion 164 



VII. The FlLUM. — The running stem of a 

 creeping plant 



It is not specified in the text for use; but 

 will be necessary : so also, perhaps, the Stelechos, 

 or stalk proper (26), the branched stem of an 

 annual plant, not a grass ; one cannot well talk of 

 the Virga of hemlock. The ' Stolon ' is explained 

 in its classical sense at page 158, but I believe 

 botanists use it otherwise. I shall have occasion 

 to refer to, and complete its explanation, in speak- 

 ing of bulbous plants. 



