THE LEAF BUD. 



45 



Plaited or plicate, each leaf folded like a fan ; vine, birch. 



Circinate, when each leaf is rolled or coiled downwards from the 

 apex, as in the sun-dew and ferns. 



Convolute, the leaf wholly rolled up from one of its sides, as in the 

 cherry. Involute, having both edges rolled inwards as in apple, violet 

 jRevolute, with, both margins rolled go 81 



outwards and backwards, as in the 

 dock, willow, rosemary. 



Vernation. 77, of birch leaf; 78, of lilac, (imbricate); 79, cherry leaves, (convolute) ; 80, dock 

 bud, (revolute) ; 81, balm of Gilead, (involute). 



214. The general vernation is loosely distinguished in descriptive 

 botany as valvate (edges meeting), and imbricate (edges 

 overlapping), terms to be noticed hereafter. The val- 

 vate more often occurs in plants with opposite leaves. 

 Imbricated vernation is 



Equitant (riding astraddle), when conduplicate leaves 

 alternately embrace — the outer one the next inner, by 

 its unfolded margins, as in the privet and iris. 



B2. Vernation of Sy. 

 camore bud. 



Obvolute, or half- equitant, when the outer leaf< 

 embraces only one of the margins of the inner, 

 as in the sage. 



Triquetrous, where the bud is triangular in sec- 

 tion, and the leaves equitant at each angle, as in 

 the Carices. 



215. The principle of budding. Each leaf-bud 

 may be regarded as a distinct individual, capable of 

 vegetating either in its native position, or when 

 removed to another, as is extensively practiced in 

 the important operation of budding. 



216. Bulblets. In the tiger-lily, Cicuta bulbifera, 

 and Aspidium bulbiferum, the axillary buds spon- of "budding." 

 taneously detach themselves, fall to the ground, and become new plants. 

 These remarkable little bodies are called bulblets. 



83, 84, Showing the process 



