76 APPENDAGES. 



4. Prickles, arising from the bark only, and coming 



off with it, as in the Rose and Bramble, 

 fig. 1, pi. 37. They are either straight or 

 hooked. Simple or triple. 



5. The Tendril, by means of which the Vine, Red- 



berried Briony, and other plants of similar 

 habit are assisted in climbing, fig. 2. It is 

 a production of the leaves in some plants ; 

 of the petioles in others. It is either simple, 

 as in Bryonia, fig. 2, compound, as in the 

 Tufted Vetch, (Vicia cracca) fig. 3,^ or fur- 

 nished with leaves, as in some species of 

 Lathy rus. 



6. Glands, or small tumours, as on the stem and 



calyxof the Moss-rose ; the leaf-stalks of 

 the common Guelder-rose ; the serratures 

 of the leaves of the Willow ; at the base 

 of the leaf in the Bird-cherry, (Prunus 

 padus) ; at the back of the leaf in Tama- 

 risk ; on the surface of the leaf in Sundew ; 

 on the Stipulse in the Dog-rose, fig. 1, pi. 

 36 ; on the receptacle between the stamens 

 in cruciform flowers ; on the petals in 

 Hypericum. 



