SALICACEiE 131 



ovary covered with white tomentum ; alpine pastures. S. 

 phylidfoUa, L. (including Weigeliana, Willd.) ; similar, 

 but catkins thick, dense, sessile ; Tirol. .S. Myrsinites, 

 L. (including ovata, Sen, and Jacquiniana, Willd.) ; stem 

 prostrate, leaves green and shining on both sides, catkins 

 on long stalks, ovary at first woolly; alpine pastures, 

 frequent. S. daphnoides, Vill. ; catkins appearing before 

 the leaves, branches glaucous-blue ; sub-alpine. 6'. Lap- 

 ponum, L. {helvetica, Vill.) ; leaves elliptic-lanceolate, 

 densely white-tomentose beneath, stipules half-cordate, 

 catkins sessile ; high, moist, frequent. 5. glauca, L. ; 

 leaves narrowly lanceolate, silky on both sides, after- 

 wards glabrous, stipules ovate, acute, catkins on long 

 stalks ; alpine pastures ; Switzerland, Tirol. 



C. Catkins terminal, at the apex of shoots of the same 

 year; low shrubs: — S. reticulata, L. (PI. 106); leaves 

 large, elliptic, entire, with prominent nerves and white 

 tomentum beneath, catkins silky, on long stalks; high, 

 frequent. 6'. vestita, Pursh. ; resembling the last, but 

 leaves more woolly, catkins on short stalks, tomentose; 

 Salzburg, rare. kS. herbacea, L. ; stem prostrate, leaves 

 very small, nearly orbicular, crenate-serrate ; very high ; 

 Switzerland, Dauphiny, Pyrenees. S. retusa, L. (including 

 Kitaibeliana, Willd.) ; leaves obovate, entire, truncate, 

 with parallel nerves; high, frequent. S. serpyllifolia, 

 Koch ; leaves smaller, acuminate, catkins very few- 

 flowered, stems interwoven; high, frequent. 



The lowland Swiss species may be arranged under the 

 following groups : — 5. triandra, L. ; stamens 3. .S. pen- 

 tandra, L. ; stamens usually 5. S. fragilis, L., Withy; 

 leaves lanceolate-acuminate, stipules half-cordate, deci- 

 duous. 5. alba, L., White Willow ; leaves narrowly Ian- 



