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 BO 

 joined at the edges as to form u 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. 8.5 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 LadyVslipper 

 (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 ? Stipules of Grass what called ? 



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 dfwribed ? 



