158 HORSE-CHESTNUT 



lanceolate, or cuneate-obovate, tapering below and sud- 

 denly acuminate at the apex, unequally serrate, coarse ; 

 green above, paler below, at first woolly hairy, but eventu- 

 ally glabrous. The central leaflet the largest, the lower- 

 most the smallest. Leaves emerging early in spring, the 

 leaflets at first erect, but soon deflexed on the rachis, 

 somewhat like a half-closed umbrella: they turn yellow 

 and brown and fall early in autumn, the leaflets disarticu- 

 lating from the rachis (Fig. 4). 



Venation of leaflet conspicuously strict-pinnate, with 

 pubescence in the axils of the veins. The secondaries 

 numerous, 12 20 or more pairs, strong, parallel and 

 straight to the margin and there ending in teeth, as 

 do a few branches from their outer sides. Tertiaries 

 numerous, forming incomplete cross-ties and a fine re- 

 ticulation. 



B. LEAVES ALTERNATE, AND SPIRALLY INSERTED, AT 



ANY RATE ON THE ERECT SHOOTS. 



[For (2) (1) Leaves pinnate, all with a terminal odd 



see p. 175.] leaflet i.e. imparipinnate. 



[In those cases where the leaflets are three only, the 

 trifoliolate leaf is almost always pinnate, though it often 

 appears as if built up on the palmate type : see also 

 Ampelopsis, p. 175.] 



(a) Leaflets three i.e. the leaf is trifoliolate. 



(i) Leaves and shoots devoid of prickles or 

 glandular hairs : leaflets small and delicate, 

 more or less elliptic, and silky-pubescent 

 beneath. Plants not prostrate or scram- 

 bling. 



