3 12 FLORA. 



Bracts longer than the pedicels ; aments erect. 



28. S. squamata. 



Bracts much shorter than the pedicels ; aments drooping. 

 Mature leaves thin, glabrous. 29. S. perrostrata, 

 Mature leaves firm, pubescent or tomentose beneath. 



30. S. Bebbiana. 

 b. Mature leaves densely white-hairy beneath. 



Leaves white-tomentose beneath. 



Style, if any, less than i mm. long. 



Leaves ovate-lanceolate, slender-petioled. 30. S. Bebbiana. 



Leaves oblanceolate, short-petioled. 



Leaves 5-10 cm. long; fruiting aments 2-3 cm. long. 



31. S. humilis. 

 Leaves 2-5 cm. long ; fruiting aments about i cm. long. 



32. 6'. tristis. 

 Style over i mm. long ; leaves linear or lanceolate. 33. S, Candida. 



Leaves silvery silky beneath. 



Style shorter than the stigma ; leaves serrulate. 34. S. sericea. 

 Style longer than the stigma ; leaves entire-margined. 



35. S. argyrocarpa. 

 B. Capsule subsessile. 

 Style long. 



Tree with linear-lanceolate acuminate silvery leaves. 36. S. viminalis. 

 Low shiubs. 



Leaves glabrous, or when young covered with long white hairs parallel to 

 the midrib. 



Bracts fuscous, obovate, densely white-silky. 



Aments naked, from lateral buds. 37. S. chlorophylla. 



Aments ending short leafy branches. 



Leaves and young twigs darkening in drying. 



Leaf-blade 10-20 mm. long; aments 10-20 mm. 



38. S. Groenlandica. 

 Leaf-blade 25-50 mm. long ; aments 25-80 mm. 



Leaves broadly obovate or obcordate, obtuse. 



39. S. arctica. 

 Leaves narrowly obovate or obovate-lanceolate, often 



acute. 40. S. anglorum. 



Leaves and yellowish or light brown twigs not darkening in 

 drying. 



Leaves obovate or oblanceolate, acute. 



41. S. vacciniformis. 



Leaves broadly obovate, obtuse. 42. S. callicarpaea. 

 Bracts yellow, oblong, white-silky. 



Capsule conic, 7-8 mm. long, grayish pubescent. 



43. S. glauca. 

 Capsule ovoid-conic, 5 mm. long, densely white-villous. 



Leaves broadly obovate, obtuse, not turning black in drying. 



44. S, Waghornei. 

 Leaves broadly oblanceolate, acute, turning black in drying. 



45. S. atra, 

 Leaves permanently hairy. 



Leaves silky-pubescent, oblanceolate or lanceolate. 



46. S. stricta. 

 Leaves with scattered villous hairs spreading in all directions, broadly 



ovate. 47. S. Labradorica. 



Style very short, or generally none. 



Mature leaves covered with long silky hairs beneath. 48. S. vest it a. 

 Leaves, at least in age, not silky beneath. 



Bracts broadly obovate, fuscous, the upper portion at least glabrous. 



49. S. orbicularis. 



Bracts oblong, yellow, densely hairy. 50. S. reticulata. 



2. Filaments united ; pedicel and style none. 51. -S 1 . purpurea. 



I. Salix mgra Marsh. BLACK WILLOW. (I. F. f. 1173.) A tree, with 

 rough flaky dark brown bark, attaining a height of 40 m. and a trunk diameter of 

 I m. Leaves narrowed at the base, serrulate, somewhat pubescent when young, 

 glabrous and green above, somewhat paler, and sometimes pubescent on the veins 

 beneath. 6-12 cm. long. 4-18 mm. wide ; aments expanding with the leaves, on 

 short lateral branches, the staminate 3-5 cm. long, the pistillate 4-8 cm, long and 



