28o The Trees of Great Britain and Ireland 



JUGLANS SIEBOLDIANA, Siebold's Walnut 



Ji/_i;-Ians Siel'oldiu/ia, :Maximowicz, Mil. Biol. viii. 633 fig. (1872): Lavallee, Arbor. Segrezianum, 



p. I, tab. I. et II. (1885); Ga?-den, 1S95, xlvii. 442. 

 Ji/glans allantifolia, Hort. Sieb. ex Lavallee, loc. fit.; and Carriere in Jitvi/e Horticole, 1878, p. 414, 



figs. 85 and 86. 



A tree attaining 50 feet in height and 5 feet in girth. 



Leaves with thirteen to fifteen leaflets, which are sub-opposite, oblong, acuminate 

 at the apex, with base rounded and unequal, sub-sessile, the petiolule being less 

 than Y^y inch ; serrations fine, shallow, and irregular, directed forwards, ciliate 

 between the teeth ; upper surface finely pubescent, with both single and tufted hairs ; 

 lower surface pale in colour, covered with numerous stellate hairs, denser close to 

 the midrib on which there are glandular hairs ; rachis with long brown glandular 

 hairs and a few small glands near its base. Young shoots green, with long white 

 glandular hairs and white sessile glands ; lenticels at first white, becoming brown, 

 conspicuous. Leaf-scars obcordate, three-lobed, deeply notched above, and with a 

 transverse band of pubescence along the upper edge. 



Flowers : staminate catkins very long, up to 12 inches, with bracts obtuse at the 

 apex and very villous, scale five-lobed. Pistillate spikes, five to twenty flowered, the 

 rachis and flowers covered with rufous tomentum. 



Fruit in long racemes which are ten to twenty inches long ; globose to ovate- 

 oblong, shortly acuminate at the apex, viscid and covered with stellate hairs. Nuts 

 ovoid or globose, rounded at the base and acuminate at the apex, with thick wing- 

 like sutures, very slightly wrinkled and pitted, not ribbed, rather thick-shelled. 



Identification 



This species seems to be practically identical in leaves and shoots \n\\}\ Jnglans 

 mandslmrica, and differs little in these respects ^xom Jiiglans cordifornns, except 

 that the leaflets of the latter are distinctly cordate at the base. All three species 

 differ, however, remarkably in fruit, and must be kept distinct on that account. 

 They belong to the section of walnuts with bearded leaf- scars, and are readily 

 distinguished imm Jiiglans cincrea, the other species of this group, by having the 

 leaf-scars deeply notched above. 



In winter the following characters are available :— Twigs stout, brown, glabrous 

 except near the tip, where the pubescence of summer is retained. Leaf-scars large, 

 on very slightly raised pulvini, obovate, two-lobed above ; upper margin convex, 

 with a central notch, and surmounted by a raised band of pubescence ; bundle-dots 

 in three groups. Terminal bud brownish, elongated, covered with a dense minute 

 pubescence ; outer pair of scales lobed at the apex. Lateral buds arising at an 



