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A TEXTBOOK OF THEORETICAL BOTANY 



Fig. 911. — Hippophae rhomnoides. Leafy shoot with thorn branches bearing leaves 



and secondary branches. 



modified leaves or stipules, but thorns arise from leaf-axils and often bear 

 leaves or flowers as evidence of their branch nature. The thorns of Hippophae 

 (Fig. 911) and Crataegus (Fig. 912) are examples. They commence in spring 

 as axillary shoots with normal leaves and with an apical bud, and if the shoot 



( 



