6oo 



SALICACEAE. 



Vol. I. 



Salix squamata Rydb., with fruiting aments persistent until September on leafy branches, 

 the yellowish scales longer than the pedicels, is probably a state of the preceding species. 



23. Salix humilis Marsh. Prairie 

 Willow. Fig. 1473. 



Salix humilis Marsh. Arb. Am. 140. 1785. 



A shrub, 2°-8° tall, the twigs tomentose 

 or pubescent, terete. Leaves mostly oblanceo- 

 late, petioled, rather firm in texture, 2-6' long, 

 4"-8" wide, acute at both ends or the lower 

 broader and obtuse at the apex, sparingly den- 

 ticulate, the margins slightly revolute, the 

 upper surface dark green, dull, puberulent or 

 glabrous, the lower densely and persistently 

 gray-tomentose ; petioles 2' -5" long; stipules 

 obliquely lanceolate or ovate, acute, commonly 

 persistent; aments unfolding much before the 

 leaves, sessile, ovoid-oblong, dense, the pis- 

 tillate about 1' long in fruit; stamens 2; fila- 

 ments glabrous ; stigmas nearly sessile ; capsule 

 narrowly conic, densely pubescent, much longer 

 than its pedicel. 



In dry soil, Newfoundland to Ontario, North 

 Carolina, Tennessee and Kansas. Hybridizes 

 with 5 1 . discolor. Low or bush-willow. April-May. 



24. Salix tristis Ait. Dwarf Gray Willow. Sage Willow. Fig. 1474. 



Salix tristis Ait. Hort. Kew. 3: 393. 1789. 



S. humilis tristis Griggs, Proc. Ohio Acad. 4: 301. 



1905. 



A tufted, slender shrub, i°-2° tall, the twigs 

 terete, puberulent, the roots long and thick. 

 Leaves oblanceolate or linear-oblong, acute or 

 obtusish, somewhat undulate, green and puberu- 

 lent or glabrous above, persistently white- 

 tomentose beneath, crowded, I '-2' long, _ their 

 margins revolute; petioles i"-3" long; stipules 

 minute, deciduous; aments expanding much be- 

 fore the leaves, dense, very small, few-flowered, 

 sessile, the pistillate globose-ovoid and about ¥ 

 long in fruit; bracts persistent; stamens 2; fila- 

 ments glabrous; stigmas sessile or nearly so; 

 capsule ovoid with a long, slender beak, tomen- 

 tulose, about 3" long, much longer than its fili- 

 form pedicel. 



In dry soil, Nova Scotia (?), Maine to Minnesota, 

 Florida, Tennessee and Nebraska. March-April. 



25. Salix phylicifolia L. Tea-leaved 

 Willow. Fig. 1475. 



Salix phylicifolia L. Sp. PI. 1016. 1753. 



A shrub i°-io° high, much branched, the twigs 

 glabrous, dark purple-greeny sometimes glaucous. 

 Leaves oblong, lanceolate or elliptic, acute or obtuse 

 at the apex, minutely repand-crenulate or entire, 

 narrowed at the base, bright green and shining 

 above, pale and glaucous beneath, i'-3' long, i'-i' 

 wide; petioles 3"-8" long; stipules minute, fuga- 

 cious, or wanting; aments sessile, dense, oblong- 

 cylindric, the staminate 1' or less long, the pistil- 

 late 1-2' long in fruit; bracts villous, persistent; 

 stamens 2; filaments glabrous; style rather longer 

 than the stigmas; capsule conic, acute, pubescent 

 or tomentose, 2i" long, much longer than its pedicel. 



Swamps, Labrador to Alaska and the mountains of 

 Maine, New Hampshire and Vermont. Europe. Summer. 



Salix chlorophylla Anders., does not appear to be 

 specifically distinct. 



