Q24 OP THE FULCRA, 



The permanent footstalks of the Gum 

 Tragacanth shrub, Astragalus Traga- 

 cantha, are hardened into real spines, as 

 are the flowerstalks in Pisonia, as well 

 as the stipulas of Xanthium spinosum and 

 the Mimosa. — Linn. Mss. 



4. Acidens, a Prickle, arises from the bark 

 only, and comes off with it, having no 

 connection with the wood, as in Rosa, 

 Rubus (the Bramble Raspberry, &c), and 

 Zizyphm, Willd. Sp. PL v. 1. 1102. 



This is not liable to disappear by cul- 

 ture, being very distinct in nature from 

 the last. 



Cirrus* A Tendril. This is indeed pro- 

 perly called a fulcrum or support, being 

 intended sole! y to sustain weak and climb- 

 ing stems upon more firm and sturdy ones. 

 By its means such climbers often reach, 

 in tropical forests, to the summits of lofty 

 trees, which they crown with adventitious 

 blossoms. Tendrils or claspers when young 

 are usually put forth in a straight direc- 

 tion; but they presently become spiral, 



