ARRANGEMENT OF THE LEAVES. 35 



has its stipules adnate ; that is, growing to the petiole. The 

 Pansy has large stipules deeply cleft into many segments. 



47. Figs. 85-88 are very instructive. Fig. 88 is a 

 Pear leaf, with an ovate blade, a slender, cylindric petiole, 

 and a pair of small, narrow stipules (s). Fig. 86 is a Knot- 

 grass leaf, with an ochrea (s) ; that is, a pair of stipules so 

 joined at the edges as to form a sheath around the stem. 

 Fig. 87 is a Grass leaf, linear, with a ligule (s) supposed to 

 be the top of a doubled stipule. Fig. 85 is a very compound 

 leaf of Conioselinum, having a broadly winged, sheathing 

 petiole. 



LESSON IX. 



ARRANGEMENT OF LEAVES AND BUDS. 



48. If you carefully notice how the leaves are distributed 

 over any plant, — the Corn plant, for example, — you will soon 

 admire their order and exactness in this respect. At first 

 view, we might suppose their positions all accidental ; but it 

 is not so, and much of the peculiar aspect of the plant de- 

 pends upon this circumstance. 



49. In the Corn plant, or in this figure of Lady's-slipper 

 (89), we find the leaves alternate, — that is, one on this side, 

 the next one higher and on that side, and so on. So it is in 



46. Stipules ; can you repeat the definition ? Describe the stipules of the 

 Rose. Describe the stipules of the Pansy. 



47. Describe the stipules of the Pear. Stipules of Knot-grass — what 

 called ? Stipi^es of Grass — what called 1 



48. Are the positions of the leaves on the plant accidental ? 



49. Can you describe the alternate arrangement ? How is this arrange- 

 ment more accurately described? 



