PUBESCENCE. 39 



II. ARMS, (arma.) 

 Weapons of defence. 



1. SPINE, (spina.) PI. 10, fig, 1. A Thorn. This 

 proceeds, not from the bark, but from the wood itself. 

 Ex. Thorn, Cratwgus. 



Observation. Sometimes disappears by culture* 



2. PRICKLE, (aculeus.) PL 10, fig. 2. Arises from 

 the bark only, and conies off with it, having no con- 

 nexion with the wood. Rose and Raspberry. 



Observation. Does not disappear by culture. 



III. SUPPORTS, (fulcra.) 



1. TENDRIX, (cirrus.) PL 8, %. 8. A fibre, in- 

 tended to support weak and climbing plants, upon 

 more firm and sturdy ones. Ex. Pea and Cucumber. 



Observation. 1. The tendrils of the Creeper, Vitis quinquefolia, 

 will adhere to the smoothest flint. 



In some cases, the flower and leaf-stalks perform the part of 

 tendrils, by clinging 1 to other bodies for support, as the leaf- 

 stalks do in the Virgin's-bovver, Clematis Virginiana. 



2. Linnxus applied the term supports, (fulcra) to all the va 

 rious kinds of appendages, but it seems not to apply very proper- 

 ly to any of them except the tendril, 6cc. 



3, The prickles of the Sweet-briar Rose, being recurved like 

 hooks, serve as supports by taking hold of other bodies. 



IV. PUBESCENCE, (pubes.} 



Glands, hair, &c. which are found on the surface of 

 the plant. 



1. GLAND, (glandula) a little tumour discharging 

 a fluid. Ex. On the calyx of the Moss Rose. Pt. 10, 

 fig. 4, a. On the foot-stalks of the Snow-ball, Vibur- 

 num opulus, and the various species of Passion-flower. 

 PL 10, fig. 3. 



2. HAIR, (pilus.) PL 10, fig. 6. The hairs on 

 plants are either simple, serving the purpose of pro- 

 tection from cold, or they are ducts, discharging a fluid. 



Observation, The hairiness of plants is liable to disappear by 

 culture. 



