222 DIOECIA— DIANDRIA. Salix. 



cottony hairs, which retain all their whiteness when the green 

 parts turn black, and this soon happens in drying. Leaves 

 elliptic-oblong, a little heart-shaped, or cut away, at the base, 

 from 2 to 3 inches in length, and at least one in breadth, sharp- 

 pointed, flat ; bordered with shallow serratures, or blunt notches ; 

 the upper surface of a dull green, minutely hairy ; under pale or 

 glaucous, more densely downy, particularly the rib and veins, 

 which last are reticulated like the foregoing. Footstalks stout, 

 densely downy, half an inch long. StipuUts large, half-heart- 

 shaped, acute, wavy and partly toothed, veiny, green, almost 

 entirely smooth, contrasted remarkably with the white down of 

 the adjoining branch and footstalks, which constitutes a striking 

 character of the species. Catkins nearly sessile, cylindrical, an 

 inch or more in length, vvith small hairy hracteas. Scales black- 

 ish, bearded with long hairs, obovate ; the lower ones often 

 tapering to a point. Nect. roundish, papillary. Sta)n. swelling 

 upwards, twice as long as the scale. Anth. large, yellow. 



55. S. rupestris. Silky Rock Sallow. 



Stem trailing. Leaves obovate, acute, serrated, flat, even, 

 silky on both sides. Stipulas hairy. Branches miniuely 

 downy. Germen stalked, awl-shaped, silky. Style as 

 long as the blunt undivided stigmas. 



S. rupestris. Bonn Cant. ed. 5. 231. Engh Bof. r. 33. t. 2342. 

 Comp. ed. 4. 163. Rees's Cijd. n. 123. Hook. Scot. 285. 



On rocks in the Highlands of Scotland. 



Discovered in the Highlands, by the late 3Ir. George Anderson. On 

 the rocks of Craig Challoch and Mael Ghyrdy. Mr. W. Borrer. 

 Near Blanchland, Northumberland. Mr. Winch. 



Shrub. May. 



Stems trailing, or depressed, with dark-coloured hranches, very 

 finely downy when young. Leaves about an inch long, obovate, 

 or elliptical, acute, even and flat, veiny, but not wrinkled, finely 

 and regularly serrated, beautifully silky with depressed hairs, 

 more especially beneath, and when young. Footstalks downy 

 in the manner of the branches. Stipulas ovate, very minute, 

 externally hairy, often wanting. Buds small, brisdy. Catkins 

 rather before the leaves, sessile, ovate, thick, half an inch long ; 

 the fertile ones soon becoming thrice thatlength, and more lax j 

 the hracteas of all oblong, smooth above, very silky at the back. 

 Scales blackish, obovate, more or less bluntly pointed, bearded 

 with long hairs. Nect. papillary. Stam. twice the length of 

 the scale, capillary, with ovate yellow anthers. Germ, on a 

 longish hairy stalk, ovate-awlshaped, clothed v.ith silky hairs, 

 and projecting far beyond the scales. Style smooth, twice or 

 thrice as long as the blunt undivided stigmas. 



