Botany of the Southern states . Ternate leaf. lets, it is called a ternate leaf. (Fig. 90.) If subdivided bythree, they are bi-ternate, tri-ternate, &c. (Fig. 91.) 96. Besides the preceding varieties of leaves, which may beconsidered their common forms, they often assume a variety ofmodifications which deserve a special attention. These varia-tions arise from a variety of causes, which will be noticed underthe several examples which we shall adduce. A cohesion of Fig. Biteraate leaf. parts not unfrequently creates a variation from the usual two leaves unite by their bases, they
Botany of the Southern states . Ternate leaf. lets, it is called a ternate leaf. (Fig. 90.) If subdivided bythree, they are bi-ternate, tri-ternate, &c. (Fig. 91.) 96. Besides the preceding varieties of leaves, which may beconsidered their common forms, they often assume a variety ofmodifications which deserve a special attention. These varia-tions arise from a variety of causes, which will be noticed underthe several examples which we shall adduce. A cohesion of Fig. Biteraate leaf. parts not unfrequently creates a variation from the usual two leaves unite by their bases, they are connate. Whenleaves adhere to the stem, forming a kind of wing beneath,then they are said to be decurrent. The bases of the upperleaves of the Caprifolium sempervirens are brought in contactfrom the unusual development of both systems of the leaf, andthey grow together, forming a perfoliate leaf. The same takes When tripinnate ? If farther divided, what are they called ? What isan unequally pinnate leaf ?—95. What is a digitate leaf? When calledternate ? Bi-ternate ? Tri-ternate ?—96. When are leaves said to be con-nate? When decurrent? When perfoliate? 8* 58 LEAVES. place in many other plants, and the occurrence differs in norespect from what happens in the production of twin applesand other similar formations, except in its uniformity, whichDe Candolle denominated constant accidents. Why it shoulduniformly occur, and only in the upper leaves, we are unabl
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