VII] NUMBERS OF BUD-SCALES 53 



Vine Poplars Willows 



Guelder Rose Ampelopsis Hawthorn 



Mulberry Hop Magnolia 



Beech Ailanthus. 



The number of bud-scales varies considerably. While 

 the Willows, for instance, only present a single scale to 

 the external view really formed of two scales fused into 

 one the buds of many Pines and Firs may have as many 

 as a hundred to three hundred and fifty. Very useful 

 characters for diagnostic purposes are afforded by the 

 practically constant number of scales observable externally 

 in each species. Thus, there is but one scale exposed in 



Willows Guelder Rose. 



Two or three scales are visible in 

 Lime Alder Plane 



Sarothamnus Bittersweet Fig 



Vine Ampelopsis Hippophae 



Laburnum Chestnut. 



There are about two to four exposed in 

 Dogwood Privet Ash. 



The following have several scales, i.e. about five or six 

 to ten or a dozen visible : 



