THE LEAF BUD. 



45 



Plaited or plicate, eaci 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 

 Iievolute,-with. both margins rolled go 8i 



outwards and backwards, as in the 

 dock, willow, rosemary. 



77 TS 79 



Vernation. 77, of bii-oh l^if ; 78, of lilac, (imbricate) ; 79, cherry leaves, (convolute) ; 

 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 gj. vernation of Sy. 

 its unfolded margins, as in the privet and iris. 



Obvolutb, 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 equjtant 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, Cicutabulbifera, 

 and Aspidium bulbiferum, the axillary buds spon- 

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

 These remarkable little bodies are called bulblets. I 



1, 84, Showing the process 

 of "budding." 



