438 The Trees of Great Britain and Ireland 



tips. Rachis of the leaf not winged. Leaflets fifteen to twenty-seven, 

 membranous ; under surface without glands and glabrous except for stellate 

 pubescence on the nerves and in their axils. Fruit, | inch broad, 

 glabrous ; wings semi-orbicular. In cultivation. See description below. 

 "'■* Bjuis long, conical, beaked at the apex, enclosed during summer and autumn 

 by a membranous funnel-like covering, composed of several scales. 



6. Pterocarya macroptera, Batalin, Act. Hort. Petrop. xiii. lOO (1893). China: 

 mountains of Kansuh. 



Small tree, about 20 feet in height. Twigs glabrous. Rachis of the leaf 

 not winged, rusty - tomentose. Leaflets nine to eleven, acute, rusty- 

 tomentose on the midrib and nerves beneath. Fruit : nut pubescent, 

 wings broadly ovate, pilose, \\ in. long by i inch broad. Not introduced. 



7. Pterocarya rhoifolia, Siebold et Zuccarini. Japan. 



Tree, rarely attaining 100 feet. Twigs glabrous. Rachis of the leaf not 

 winged. Leaflets fifteen to twenty-one ; under surface glandular with 

 tomentum along the midrib and veins and in their axils. Fruit, i inch 

 wide ; wings rhombic, broader than long, glabrous. Introduced. See 

 description below. 



PTEROCARYA CAUCASICA 



Pterocarya caucasim, C. A. Meyer, Verz. Pflanzen Caucasus, 134 (183 1); Loudon, Arb. et Frut. 



Brit. iii. 1452 (1838). 

 Pterocarya fraxinifolia, Spach, Hist. Nat. Veg. ii. i8o (1834); Lavallee, Arb. Segrez. Icones. 73, 



t. 21 (1885). 

 Pterocarya Spachiana, Lavallee, op. cit. 69, t. 20. 



Pterocarya sorbifolia, Dippel {non S. et Z.), Laubholzk. ii. 327 (1892). 

 Juglans fraxinifolium, Lamarck, Encyc. Meth. iv. 502 (1797). 

 Jriglans pterocarpa, Michaux, Fl. For. Am. ii. 192 (1803). 

 Rhus obscura, Bieberstein, Ft. Taur. Cauc. i. 243 (1808). 



A tree attaining 100 feet in height and 10 feet or more in girth, usually 

 however smaller, and tending to branch into several stems at no great height above 

 the ground. Bark dark grey and furrowed. Shoots glabrous. Leaves (Plate 125, 

 fig. i) 16 to 20 inches long, on a stalk 2 to 3 inches long, only slightly swollen at 

 its base; rachis not winged. Leaflets fifteen to twenty-seven, opposite or sub- 

 opposite, sessile or sub-sessile, 3 to 5 inches long ; oblong or oblong-lanceolate ; acute, 

 acuminate, or obtuse at the apex ; unequal and rounded or narrowed at the base ; dark 

 green above ; under surface lighter green, without glands, glabrous except for some 

 stellate pubescence along the nerves and in their axils ; thin in texture ; sharply and 

 finely serrate. Stamlnate catkins several, each in the axil of a leaf-scar on the 

 preceding year's shoot, rarely one or more on the current year's shoot ; scale usually 

 five-lobed, stamens twelve to fifteen. Fruiting catkins up to eighteen inches long. 



