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A TEXTBOOK OF THEORETICAL BOTANY 



its embryonic character during the whole period of the development of the 

 leaf, which therefore increases progressively in length, like a Fern leaf, and 

 is indeed usually circinate like the leaves of that group, the growing apex 

 being thus protected by being rolled up within a covering of older, more 



Fig. 965. — Drosera iudica. Showing apical growth of circinate leaves. 



[After Diels.) 



resistant parts. Such is the case in the long leaves of Drosophyllum, which is 

 a close relative of the insectivorous Drosera, and it is also true of leaves of 

 some species of Drosera (Fig. 965), and of Utricularia. Leaves are normally 

 organs of limited growth, but in this latter genus the place and functions of 



f 



