322 



COVILLE 



Kearney (No. 1875), Trelease and Saunders (No. 3373), Brewer and 

 Coe (No. 380). 



Kotzebue SouJtd. — On Chamisso Island, Berthold Seemann, 1848— 



1850. 



In addition to these localities, the plant is reported from the Upper 

 Yukon valley. 



There is a tendency among American willow students to exclude 

 Salix glauca from the North American flora, but our Alaskan speci- 

 mens show so close an agreement with some European material of this 

 species that I am unwilling to separate them. A Salix seemanmi'h^.s 

 been described very recently,^ the type specimen collected at Dawson, 

 Yukon Territory, by R. S. Williams, June 11, 1899. The species is 

 credited also to Kotzebue and Norton sounds, Alaska, on the basis of 

 collections made by Berthold Seemann. No comparison of the differ- 

 ences between glauca and seeuiannii is made by the author, nor am 

 I able to find in the description a record of any characters that serve to 

 distinguish the specimens assigned to the latter species from forms of 

 glauca found in America and Europe. 



II. SALIX NIPHOCLADA Rydberg. Mouseleaf Willow. 

 Salix iiiphoclada Rydberg, Bull. N. Y. Bot. Gard. i : 272. 1899. 



An erect bushy willow, at least half 

 a meter in height, the twigs and lower 

 surfaces of the leaves in dried specimens 

 very gray, almost mouse-colored, from their 

 glaucousness and appressed hairs, and the 

 darkening of the tissues in drying. The 

 leaves are oblong-lanceolate to ovate- 

 lanceolate, acute at the apex, rounded or 

 cordate at the base, on petioles 2 mm. or 

 less in length, entire or with a few ob- 

 solescent teeth toward the base, commonly 

 1.5 to 3.5 mm. long, the lower surface 

 very glaucous and, in all except some of 

 the lowermost rudimentary leaves, with a 

 rather sparse, permanent, rather appressed 

 pubescence of somewhat curly hairs, the 

 upper surface green and with a sparse (except in the upper leaves of 

 vigorous twiga) pubescence of longer appressed hairs like those on 

 the twigs. The slender catkins, about 4 to 6 mm. in diameter, are 

 1 Rydberg, Bull. N. Y. Bot. Gard. 2 : 164. 1901. 



Fig. 20. Salix niphoclada 

 Rydberg : a, pistillate flower- 

 ing twig, natural size; b, pis- 

 tillate flower, enlarged six 

 diameters ; c, mature leaf, 

 natural size. 



