64 



THE VEGETATIVE SHOOT 



GROUP III. 



BUDS ARRANGED SPIRALLY ON THE TWIGS (Fig. 28). 

 To this group belong :- - 

 Birch. 



i 



Fig. 28. 

 Twig of Plum 

 tree, showing 

 .spiral arr.inge- 

 tnent of buds. 



Walnut. 



Oaks. 



Willows. 



Poplars. 



Alder. 



Wild Service. 



White Beam. 



Mountain Ash. 



Hawthorn. 



Blackthorn. 



Plums. 



Cherries. 



Pear. 



Apple. 



Black Currant. 



Red Currant. 



Gooseberry. 



Raspberry. 



Blackberry. 



Barberry. 



1. Pith divided into cliaml)ers. 



Walnut {/tig/ans regia L.). Young twigs thick, 

 leaf-scars very large. Lateral buds small, round, 

 black and smooth, the terminal one much larger 

 and hairy. 



2. Buds naked, i.e. without protecting bud-soales. 



Black alder [Rhamnus Frangula L. ). Young twigs 

 reddish. 



3. Buds distinctly stalked. 



(a) Apparently only one bud-scale visible. 



Alder {Alnus glutinosa Gaert. ). Young twigs iiTegu- 

 larly triangular in section, brown or reddish-brown 

 in colour. The buds are angular, dark brownish- 

 red, and their stalks J-inch or more long. 



(fi) Several bud-scales visible. 



Black Currant {Ribes nigrum L. ). Twigs smooth, 

 pale brown or pale greyish buff; buds plump, 

 round, blunt at tips, bud-scales dark pink or 

 brownish-pink, sometimes greenish. With aid of 

 a lens yellow glands are visible on the bud stalks 

 and scales. 

 Red Currant {Ribes rubrum L.). Twigs with loose, 

 fluffy, ashy grey bark ; buds thinner, longer, and 

 more pointed than black currant ; their scales 

 dark chestnut brown, with fine woolly hairs. 



