184 The Botanical Gazette. [June, 
Atlanthus glandulosus; Ulmus fulva Michx., fig. 3). While 
in many species all, or almost all, of the tips of the branches 
are thus affected, in others (species of sculus) only one 
half the tips of the branches are thus terminated, while the 
remainder show the usual terminal scaly buds 
In other species the tip of the branches shrivels up at a 
very early date, before summer, but is not cast off, the shriv- 
eled tip remaining through the winter (Déospyros Virgini- 
ana Linn.; species of lilac). o 
3. Again in other cases the tiny tips are not killed in early 
spring, but quite a considerable portion of the more devel- 
oped branch is killed back by the frosts of autumn. 
. Lastly, in the great majority of species, terminal scaly 
Me 
i 
Hamamelis Virginica Linn.) In certain species the stipules 
are represented by thorns, as in Robinia Pseudacacta er 
and Xanthoxylum Americanum Mill. When these stip¥ 
thorns are aborted, as occurs at times in the latter speci® 
bark. Most ligneous plants never have stipules. 
VI. The presence of thorns in general ofte 
sixth means of distinguishing plants. Thorns re : 
stipules have already been mentioned. They often alee we 
resent small axillary branches, usually supplemented by 0 
mal leaf buds at their base. The relative position 4 f 
means ° 
distinguishing species. Thus, in Gleditschia 1 jacanthes 
n provides a 
presenting 
5 
bud, and is often decidedly removed from the s 
