SUMACH, TREE OF HEAVEN, ETC. 211 



Rhus typhina. Sumach. The buds are really naked, 

 on somewhat prominent oblique leaf-bases, and the leaf- 

 traces grouped (Fig. 59 i). Pith large and brownish. 

 Twigs stout, rounded, olive-brown and densely velvety- 

 haired, passing to smooth with prominent lenticels. The 

 terminal or pseudo-terminal bud not larger than the 

 laterals : exposing about 2 leaves. 



Buds almost dome-shaped, exposing 

 about 3 scales, slightly pubescent; 

 leaf -scars shield-shaped, with 7 curved 

 leaf -traces equally distributed; twigs 

 smooth, buds, leaf-bases hardly pro- 

 truding. 



Ailanthus glandulosa. Tree of Heaven (Fig. 59 c). 

 Buds small and all equal in size, red-brown with a grey 

 tomentum. Pith large, brown-orange. Twigs practically 

 glabrous, shining yellowish to reddish brown or olive, 

 with pale scattered and elongated lenticels. 



The terminal bud is usually aborted. The bud begins 

 with two much reduced scales, right and left, followed by 

 a third scale facing the axis, then passing on spirally. 

 The third onwards may show rudiments of the lamina at 

 the apex, and the innermost leaves have minute stipules. 



Twigs devoid of latex, but with chambered 

 pith; leaf -scars broad Y-shaped, with 3 

 compound leaf-traces, on prominent leaf- 

 bases. Buds fat-ovoid, the terminal or 

 pseudo- terminal the larger. 



Juglans regia, L. Walnut (Figs. 108 and 59 d). The 

 true terminal bud is usually aborted, its scar subtending 

 the leaf-opposed side of the large pseudo-terminal bud. 

 Twigs glabrous, shining, with numerous longish lenticels. 

 Pith broad and angular, and broken up into close-set 



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