SALICACEAE. 315 



long, 1-3 cm. wide; petioles 1 cm. long or less; stipules often 1 cm. long, per- 

 sistent or deciduous; aments unfolding long before the leaves, the staminate about 

 3 cm. long, the pistillate 7-10 cm. long; style very short; capsule narrowly ovoid. 

 On river banks, Mo. and Neb. Wood dark brown. March- April. 



13. Salix lutea Nutt. Yellow Willow. A shrub, 2-5 m. high, with light 

 gray rough bark; twigs very light yellow, slender and shining, perfectly glabrous; 

 leaves lanceolate, 4-7 cm. long, 10-18 mm. wide, long-acuminate at the apex, cu- 

 neate at the base, finely serrate, yellowish green and shining above, glaucous 

 beneath, rather thin; stipules small and generally deciduous; aments on short lat- 

 eral branches, short; the pistillate 2-3 cm. long in fruit; style very short; capsule 

 ovoid. On river banks and springy grounds from Neb. to Assiniboia and Mont. 



14. Salix acutidens Rydb. Sharp-toothed Willow. Shrub, 2-3 m. high, 

 bark green or on the younger branches often purplish; leaves rather thin, 6-12 

 cm. long, 3-4 cm. wide, oblong, long-acuminate, rounded or acute at the base, 

 shining above, more or less glaucous beneath, very sharply dentate, the teeth tipped 

 with a small gland; stipules obliquely ovate, large, toothed and persistent; aments 

 leafy-bracted below; fertile ones slender, in fruit 3-4 cm. long; bracts yellow, 

 obovate, hairy; style about 1 mm. long; capsule ovoid. The form of the leaves is 

 intermediate between that of S. cordata and S. eriocephala with the texture of that 

 of S. balsamifera; but the small glabrous short-pedicelled capsule distinguishes 

 the species. Swamps of Conn., N. Y. and Penn. (S. myricoldes Torr. Fl. N. Y. 

 2: 207; not Muhl.) 



15. Salix adenophydla Hook. Furry Willow. (I. F. f. 1203.) A straggling 

 shrub, 1-2.5 m - high, the twigs, petioles, stipules and leaves densely silky-tomen- 

 tose, the silky hairs falling away from the leaves when old. Leaves ovate, acute 

 or short-acuminate, or the lower obtuse at the apex, cordate or rounded at the base, 

 finely serrulate with gland-tipped teeth, 2-5 cm. long, 15-30 mm. wide; petioles 

 stout, 3-6 mm. long, dilated at the base; stipules ovate-cordate, obtuse, serrulate, 

 persistent; aments leafy-bracted at the base, dense, expanding with the leaves, the 

 staminate about 2 cm. long, the pistillate 3-10 cm. long in fruit; style filiform; 

 capsule ovoid-conic, acute, 3-4 mm. long. On lake and river shores, Lab. to Ont,, 

 Penn. and 111. Hybridizes with S. cordata. April-May. 



16. Salix myrtillifdlia Anders. Bilberry Willow. A shrub generally less 

 than I m. high, with erect branches, much resembling Vaccinium Myrtillits in 

 general habit and form of the leaves. Leaves obovate or oblong, 2-6 cm. long, 

 light green, rather thin, obtuse, seldom acute, closely and finely crenate; stipules 

 small, deciduous; aments on short leafy branches; the staminate 1-2 cm. long, 

 the pistillate 2-3 cm. long in fruit; bracts obovate, fuscous, slightly hairy; capsule 

 subsessile. ovate, tapering into a short style. From Lab. to Lower Mackenzie 

 River and Alberta. 



17. Salix Uva-ursi Pursh. Bearberry Willow. (I. F. f. 1205.) A de- 

 pressed or prostrate glabrous shrub, the terete brown branches 15-30 cm. long, 

 diffuse from a deep central root. Leaves obovate or elliptic, obtuse or acute at the 

 apex, narrowed at the base, crenulate-denticulate or entire, 8-20 mm. long, 4-10 

 mm. wide, prominently veined, deep green and shining above, pale beneath; peti- 

 oles 2-4 mm. long; aments leafy-bracted at the base, dense, about 1 cm. long in 

 flower, the pistillate 2-5 cm. long in fruit; bracts obovate. obtuse, densely silky; 

 stamens usually solitary, rarely 2; style short; capsule ovoid-conic, acute, gla- 

 brous, very short-pedicelled. Lab. and Hudson Bay, south to the summits of the 

 mountains of N. Y. and N. Eng. May-June. 



18. Salix herbacea L. Dwarf Willow. (I. F. f. 1206.) A depressed 

 matted shrub, with very slender angled twigs 2-15 cm. long, the youngest foliage 

 somewhat pubescent. Mature leaves glabrous, suborbicular, rounded or retuse at 

 the apex, cordate or rounded at the base, thin, crenulate-denticulate all around, 

 finely reticulate-veined, bright green and shining on both sides, 1-2 cm. in diam- 

 eter; petioles very slender, 4-8 mm. long; aments terminating 2-leaved branchlets, 

 4-10-flowered, 4-8 mm. long; bracts obovate. obtuse, persistent, glabrous or nearly 

 so; stamens 2; style rather longer than the 2-cleft stigmas; capsule narrowly 

 conic, glabrous, nearly sessile. Lab. and Quebec, through Arctic America, and 

 on the White Mountains of N. H. and Mt. Katahdin, Me. Also in Europe and 

 Asia. Summer. 



