];lj;s and leaves. 



never do. The liorsc-cliestniit, owing to this accommodating 

 faculty, lias become one of the most prized ornaments of 

 our avenues and gardens; while the orange, after years and 

 years of endeavor on the part of horticulturists, thrusts its 

 young buds into the chilly air to perish at the first breath 

 of Jack Frost. 



SECTioiq- II. — The Leaf. 



59. The leaf next claims our attention. All leaves are 

 not i^acked up alike. Each species of tree differs as much 

 in that respect as in any other. In fact, there is notliing 

 which charms a botanist more than this endless variety. 

 From the infinitesimally small grain of pollen to leaves, 

 boughs, and roots, each tree has its own undeviating form, 

 its characteristic peculiarity that never varies. 



60. Thus the rose family invariably fold their leaves 

 upon themselves, and hence their leaves are said to be con- 

 diqjlicated, from the Latin conchijMcare, to double, to fold 

 up. 



61. When the surface of the leaves are applied to each 

 other without being rolled up, they are said to be appressed 

 (Latin, appi^essiivi, pressed to). AVhen they lie over each 

 other, like tiles on a roof, they are called imbricated {imhri- 

 catuSy covered with tiles). When the margin of the leaves 

 roll inward they are involute; Avhen outward, revolute; 

 when one leaf incloses the margin of the opposite leaf it is 

 oibvolute ; when they overlap, or ride each other, they are 

 called equitant (Latin, equitarc, to ride). When they are 

 rolled from the apex downw^ard they are circinate. 



62. This arrangement of leaves within their buds is called 

 vernation or perfoliation. 



59. What is the subject of this section ? Are all leaves packed up iu their 

 buds alike ? 



60. How is the rose family folded ? 



61. What are their leaves said to be ? AVhat is appressed ? Involute? Revo- 

 lute? Obvolute? Equitant? Circinate? 



62. "What is this arrangement of leaves within their buds called ? 



