NOMENCLATURE OF THE LEAF. 53 



or its parts, variously doubled together. There are two 

 varieties of it; the doubled and plaited. 



a. Doubled, or condnplicate wben the two sides of the leaf lie 

 parallel to each other ; as in the oak, the cherry, the rose, the wal- 

 nut, the beech, and the lime. ( F. 37. ) 



b. Plaited, or plicate-when the leaf is folded up like a fan, as in 

 many of the palm tribe, in the birch, and lady's-mantle. (F. 44.) 



4. Overlapping: In this species of foliation, the mar- 

 gins of the leaves overlap those within them, or opposite 

 to them, without being rolled. There are three varie- 

 ties; the imbricate, the equitant, and the ob volute. 



a. Imbricate when the edges of two opposite leaves touch each 

 other, embracing those within them, which they cover, like tiles. 

 In some instances, the edges of the one leaf extend a little over those 

 of that to which it is opposed; while in others, the opposed edges 

 scarcely touch. The privet and lilac will afford specimens of the im- 

 bricated foliation. (F.41.) 



b. Equitant when the leaf is so folded that the two sides deeply 

 embrace the opposite leaf, which in its turn encloses the one opposed 

 to it ; and so on to the centre of the bud. It is beautifully exempli- 

 fied in the day lily, in the iris tribe, and in Solomon's-seal. (F.37,b.) 



c. Obvolute when one leaf, doubled lengthways, embraces within 

 its doubling one half of the opposite leaf, folded in the same manner, 

 as in the genus valerian, scabious, teasel, and sage. (F. 42.) 



5. Rolled: This division contains all those buds in 

 which the leaves are rolled, either on their lateral mar- 

 gins, or from the apex to the base. There are five varie- 

 ties ; viz. the convolute, the involute, the revolute, the 

 circinal, and the reclinate. 



a. Convolute in which the leaf is rolled lengthways in a spiral 

 manner, one margin forming the axis round which the other turns ; 

 as in the plum genus, the lettuce tribe, the cabbage, Indian corn, and 

 many grasses. (F.38.) 



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