VI QUESTIONS ON 



MOKPHOLOGY OF THE LEAF. 



239. What is the blade ? What is the petiole ? 

 Explain the meaning of the word sessile. Petiolate. 



240. What are stipules ? How many to each leaf, if any ? 

 Explain the meaning of the word exstipulate. Stipulate. 



241. Name the three distinct parts of a complete leaf. 



242. To what transformations are they liable ? 



OF THE PETIOLE. 



243. What is the more common form of the petiole ? 

 What is peculiar in the petiole of the aspen ? 



244. What is there peculiar in the petioles of the Asters, etc. ? 

 "What peculiarity in the leaves of the mullein ? 



245. How is the amplexicaul petiole, or leaf, described ? 

 What constitutes a sheath ? (See figs. 102, 104.) 



246. In what sort of leaves do we find compound petioles ? 



OF THE STIPULES. 



247. What is the location of the stipules? Appearance ? 

 What is remarked of their presence or absence ? 



248. What of the stipules of rose (fifc. 100) ? Of pansy (fig. 102)? 



249. What plants exhibit ochrece ? What their nature ? 



250. When the leaves are opposite, what are their stipules called ? 



251. The ligule of grasses, what is it? What are stipels? 

 Explain fig. 102. 103. 104. 105. 



OF THE VEINS. 



253. How do you distinguish a simple leaf? A compound? 



254. Of what is the frame-work of the leaf composed ? 



255. Why are they called veins rather than ribs ? 

 What is denoted by the term venation ? 

 Name the four organs of venation. 



256. Please describe the mid-vein. What leaf has such? 



If there be several such, as in maple, what are they called? 



257. What branches shall we call the veinlets ? The veinulets ? 



258. The venation of the Exogens name and describe it. 

 The venation of the Endogens name and describe. 

 The venation of the Cryptogamia name and describe. 

 Name the three forms of the reticulate venation. 

 Now please describe them the feather-veined. 



260. The palmi-veined. The tripli-veined. 



262. What varieties in the parallel venation ? 



What venation in fig. 106? 107? 108? 109? 110? 



FORM, OR FIGURE. 



263. Can you show the connection between the figure of the leaf and its venation? 



264. On what principle shall we arrange or classify leaf-forms? 



265. The first class, or feather- veined leaf-forms, define it. 

 Name and describe the three forms belonging to it. 



a. Define the second class of feather- veined leaf-forms. 



Name and describe the four forms belonging to this class. 



