598 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 :— 
1. Afocarya, De Candolle, Prod. xvi, 3, pi [44 . . 
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 oliveformis, Nuttall. 
Buds greyish, densely pubescent, without glands. Leaflets, eleven to 
thirteen, rarely nine; margin densely ciliate. 
2. Carya amara, Nuttall. 
Buds yellowish, slightly pubescent, glandular. Leaflets, seven to nine; 
margin irregularly ciliate. 
II. Zucarya, De Candolle, Prod. xvi. 2, Pp. 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. 
kX 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.) 
1 Carya aquatica, 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, of. ca¢. 1444, mentions a tree of this species 40 feet high growing 
at Milford near Godalming ; but his identification was probably incorrect. 
