88 PRACTICAL BOTANY. 



appear anywhere on stem and branches, sometimes even 

 on roots (which, as has been stated, are naturally un- 

 productive of buds), where they have been wounded or in 

 some way mutilated. We see them frequently on the 

 trunks and roots of Poplars, Willows, Chestnuts, etc. 

 From buds of this sort spring slender, beautiful twigs on 

 the trunk and on stout branches of the Elm. 



Accessory or swpernumera/i'y huds are those which 

 spring from a leaf-axil, in pairs, threes, etc., in place of 

 the single one. They are found in the Honey-Locust, the 

 Walnut and Butternut, the Birthwort, etc. 



Latent we call those axillary buds which suspend their 

 activity from year to year, and sometimes, indeed, so long 

 that their capacity for growth becomes extinct. 



B. INFLOKESCENCE. 



167. Inflorescence is the term employed to designate 

 the arrangement of flowers upon the stem or branch. 



As has been intimated in § 166, a flower^ud is analo- 

 gous to a leaf-bud, and a flower is a sqrt of leafy branch. 



Flower-buds occupy either the extremity of the stem 

 or branch, or the axils of leaves. 



A flower with a stalk is called a ped uncled or pedi- 

 celled flower ; that without a stalk is said to be sessile. 



168. When a stalk bears a cluster of flowers, it is 

 known as a general or main peduncle, while the stalk of 

 each particular flower of the cluster is called pedicel — that 

 is, a partial peduncle. A stalked solitary flower is said 

 to be peduncled, and a stalked flower of a cluster, pedi- 

 celled. 



That part of the general peduncle which gives rise to 

 the flowei-s is called the axis of inflorescence. The axis 

 of inflorescence is termed rhachis when the flowers at- 



