294 TEA-LEAVED WILLOW, ETC. 



above ; with rather prominent venation, bluish-glaucous, 

 but not silky, beneath, with the principal veins yellowish 

 and hardly prominent. Stipules obsolete or very small, 

 lanceolate, erect. Not black when dry. Petioles very 

 short, about 1 cm., villous. There are no upper stomata. 

 Autumn leaves yellow. Venation as in 8. nigricans. 



[S. nigricans and S. phylicifolia offer peculiar difficul- 

 ties, owing to their great variability. As a rule the more 

 equal size, thinner texture, more reticulate and duller upper 

 surface, the more glaucous under surface, the blackening 

 on drying, and the broader toothed stipules, as also 

 more pubescent shoots and twigs, distinguish the former. 

 Both offer difficulties of transitional characters towards 

 S. Myrsinites and 8. Caprea and their allies.] 



(0) Leaves exstipidate. 



[For ** see * Shoots or leaves, or both, spinescent or 



P- 299 -] thorny. 



t Shoots leafy or leaf-like ; some or all of them 

 converted into thorns or spines. 



Leaves deciduous, oblong - lanceolate to 

 linear-lanceolate, silvery scaly or bronzed 

 beneath ; shoots thorny and covered with 

 waxy bloom or with bronze scales. 



Hippophae rhamnoides, L. Sea Buckthorn (Figs. 113 

 and 114). Much branched thorny shrub, with bronzed or 

 silvery shoots and leaves. Leaves 1 6 cm. (4 5 cm. x 

 5 6 mm.), sub-sessile, obovate, narrow oblong-lanceolate 

 to linear-oblong, or even linear; obtuse, sub-coriaceous, 

 deep green and nearly glabrous or white dotted with 

 scattered stellate hairs, silvery grey with scaly scurf be- 

 neath, the midrib with rusty scales. Thorns axillary, or 

 terminating the shoots. Petiole 1 3 mm., with rusty 



