BUDS 



183 



Notice the manner in which the separate leaflets are folded 

 in the bud and make a diagram of it ; how does it differ 

 from that of the buckeye ? (Vernation 

 is always best observed in partly ex- 

 panded buds.) This kind of vernation, 

 in which each leaf or leaflet is rolled 

 over from one side to the other, is called 

 convolute. Plum, apple, canna, calla 

 lily, offer good examples of it. 



Are there any flower clusters in your 

 hickory bud ? if not, look for one that 

 has them. Are they axillary or ter- 

 minal.'' Will they stop the further ^ j ^ . 



-' ^ 335. — Expanding bud 



development of their branch .? Why of English walnut, show- 



Or why not.? '"S twice conduplicate 



J vernation. 



257. Buds with Stipular Scales. — Sketch a bud of the 

 tulip tree, or other magnolia, on the outside. (The India 

 rubber tree, oak, beech, and hack- 

 berry, furnish other examples of stip- 

 ular scales.) How does it differ in 

 appearance from the ones already ex- 

 amined .' Remove the outer pair of 

 scales and observe that (in the tulip 

 tree) their edges do not overlap as 

 in the imbricated' arrangement, but 

 merely touch, or in 

 botanical language, 

 are valvate. Notice 

 the difference in coior 

 between the outer 

 Why are the outer 

 pair so hard and thick ? Draw a cross 

 section of the bud as it appears under 

 the lens, showing the small round objects 

 that appear here and there between the 

 scales. Can you make out what they are ? Draw a verti- 

 cal section. Do you see anything Hke a flower bud ? If 



336. — Bud of tulip 

 tree, showing stipular 

 scales : :>•, j-, stipules. 



and inner scales. 



337, — Diagram o^ 

 tulip tree bud in cross 

 section, showing suc- 

 cessive leaves (1-7) 

 with stipules (6i?.5,etc.). 



