100 NOMENCLATURE OF THE APPENDAGES. 



BUD OR GEMMA. 



4. We have already mentioned buds as being of three 

 kinds, viz. the leaf-bud, the flower-bud, and the com- 

 pound-bud. We have now to mention, that buds may 

 be opposite, alternate and spiral, and sessile or stalked, 

 solitary and aggregate. 



a. Opposite placed exactly on the same line, on opposite sides 

 of the stem or branch. 



b. Alternate placed alternately, although on opposite sides. 



c. Spiral placed round the stem or branch in such a manner, 

 that a cord wound round it in an oblique direction, would touch 

 each gem. 



d. Solitary when only one gem is to he seen in the axilla of 

 each leaf, as in the greater number of instances. 



e. Aggregate when, as in some plants, two, three, or even more 

 are protruded at the same time, thus we find two in the common 

 elder, three in the broad-leaved birth-wort, and many in the tooth- 

 ache-tree. 



f. Sessile when they rise with a broad base from the surface 

 where they are protruded, and consequently are in close contact 

 with it, as with the gems of most trees and shrubs. 



g. Stalked or pedicillated when they are distant and supported 

 on a short foot-stalk, as in the common alder. 



LEAF-STALK, PETIOLE, OR PETIOLUS. 



5. The foot-stalk or petiole, is generally distinguished 

 into the apex, or part which it is inserted into the leaf, 

 and the base which comes from the stem or branch. 



The petiole or leaf-stalk, is very frequently called the foot -stalk 

 of the leaf; and again, the peduncle or flower-stalk of the (lower, is 

 also called Icefoot -stalk of the flower. 



6. There are three circumstances attending leaf-stalks, 

 which have given rise to botanical language ; these art, 

 their figure, insertion, and composition. 



