306 COVILLE 



exceeding the scale and sometimes becoming 

 twice or three times as long. 



S. bebbiana^ p. 306. 

 Stalk of the ovary not more than twice or 

 sometimes three times the length of the 

 nectary but always shorter than the scale. 

 Plant an erect shrub ; leaves permanently 

 clothed on the lower surface, and some- 

 times also the upper, with a usually sparse 

 covering of long appressed hairs ; scales 

 of the catkin light brown to straw-colored. 

 Leaves wedge-shaped at the base, on peti- 

 oles several millimeters in length. 



6". glauca^ p. 321. 

 Leaves rounded or cordate at the base, on 

 very short petioles, those on our speci- 

 mens 2 mm. or less in length. 



S. niphoclada^ p. 322. 

 Plant prostrate ; leaves often with some long 

 silky hairs when young but glabrous at 

 maturity, or with hairs only on the 

 margins or midrib ; scales of the catkin 

 almost always black. 

 Leaf-blade 1.2 cm. or less in length; cat- 

 kin short, ovoid-globose ; , style reduced 



to a mere neck S. glacialis^ p. 329. 



Leaf -blade usually much larger ; catkin 

 elongated, cylindrical ; style well de- 

 veloped S. arctica^ p. 326. 



I. SALIX BEBBIANA Sargent. Bebb Willow. 



Salix rostrata Richardson in Franklin, Journ. Pol. Sea 753. 1823 ; not 



Thuill. 1799. 

 Salix bebbiana Sargent, Gard. & For. 8 : 463. 1895. 



A small tree w^th leaves elliptical-lanceolate or ovate-lanceolate, 

 either rounded or acute at the base, acute or acuminate at the apex, 

 sparingly pubescent when young, becoming nearly smooth in age, 

 usually crenate-denticulate, but sometimes entire, commonly 3 to 5 cm. 

 long. The pale brown or straw-colored catkin scales, the pubescence 

 of the slender ovaries, their very long slender pedicels, and the almost 

 complete absence of a style are especially characteristic of the species. 

 It is widely distributed, extending almost entirely across British 



