59 8 The Trees of Great Britain and Ireland 



America, four species extending as far north as Canada, and one species confined to 

 the high lands of Mexico. Six species' (Plate 203) are in cultivation in the British 

 Isles, and will be dealt with in the following account. 

 The genus is divided into two sections : 



I. Apocarya, De Candolle, Prod. xvi. 2, p. 144. 



Buds, with four to six valvate scales, which are often obscurely pinnatifid at 

 the apex ; axillary buds, often two to three superposed, the uppermost one 

 stalked. Husk of the fruit thin, and prominently ridged at the sutures. 



1. Carya olivcs/ormis, Nuttall. 



Buds greyish, densely pubescent, without glands. Leaflets, eleven to 

 thirteen, rarely nine ; margin densely ciliate. 



2. Carya amara, NuttalK 



Buds yellowish, slightly pubescent, glandular. Leaflets, seven to nine ; 

 margin irregularly ciliate. 



n. Eucarya, De Candolle, Prod. xvi. 2, p. 142. 



Buds with ten to twelve imbricated scales, the outer falling early, the inner 

 accrescent and becoming much enlarged and reflexed at maturity. Husk of the 

 fruit thick, not ridged at the sutures. 



* Leaflets five, pubescent. 



3. Carya alba, Nuttall. 



Young branchlets with brown stellate hairs ; base of the shoot marked with 

 a dense pubescent ring. Leaflets, stellate-pubescent beneath, ciliate in margin. 



** Leaflets five or seven, glabrous. 



4. Carya porcina, Nuttall. 



Young branchlets glabrous or with only an occasional hair ; base of shoot 

 without pubescent ring. Leaflets glabrous beneath, except for axil-tufts, non- 

 ciliate in margin. 



*** Leaflets, seven or nine, pubescent. 



5. Carya sulcata, Nuttall. 



Branchlets reddish-brown, glabrous towards the tip. Leaves not fragrant ; 

 rachis nearly glabrous ; nerves in upper lateral pair of leaflets more than twenty 

 pairs. 



6. Carya tomentosa, Nuttall. 



Branchlets purplish-grey, pubescent and glandular. Leaves fragrant ; rachis 

 pubescent and glandular ; nerves in upper lateral pair of leaflets less than 

 twenty pairs. (A. H.) 



' Carya aqualica, Nuttall, the water hickory, a native of river swamps in the southern parts of the United States, is not 

 likely to succeed in any part of the British Isles. Loudon, op. cit. 1444, mentions a tree of this species 40 feet high growing 

 at Milford near Godalming ; but his identification was probably incorrect. 



