NOTES ON WILLOWS OF SECTIONS PENTANDRAE 
ND NIGRAE 
CARLETON R. BALL 
(WITH FOUR FIGURES) 
In 1905 the writer began a series of contributions under the 
title, Notes on North American Willows, of which three were pub- 
lished.t This general title has been dropped because of the great 
disadvantage of not being able to indicate clearly, in the title, the 
content and scope of each paper. For this reason the most recent 
contribution appeared under a specific title,? as does the present 
“one. These data have been derived from studies incident to the 
treatment of the genus Salix in various floras and manuals of 
botany.’ 
The location of the herbarium specimens cited is -as follows: 
B, herbarium C. R. BALL; C, Canadian Geological Survey, Ottawa; 
D, herbarium C. C. Dream, Indiana; F, Field Museum, Chicago; 
FBb, Bebb Herbarium in Field Museum; I, Iowa State Agricultural 
College; N, United States National Herbarium; N.D., North 
Dakota Agricultural College; N.M., New Mexico Agricultural 
College; R, Rocky Mountain Herbarium, University of Wyoming. 
SALIX SERISSIMA (Bailey) Fernald.—S. arguta* S. pallescens 
. Anderss. Svensk Vetensk. Acad. Handl. 6:32. 1867.—S. lucida 
serissima Bailey in ARTHUR, Bull. Geol. Nat. Hist. Survey Minn. 
t Bot. Gaz. 40:376-380. pls. 12, 13. 1905; 60:45—-54. figs. 3. 1905; and 60: 
391-399. 1915. 
2 Batt, C. R., Undescribed willows of the section Cordatae. Bor. Gaz. 71: 
426-434. fig. I. 1921. 
3 Barr, C. R., Salix in Courter and Netson, Man. Bot. Rocky Mt. Region, 
pp. 128-139. 1909. 
, Salix in Prrer and BEartie, Flora of the Northwest Coast, pp. 113-118. 
IQI5. 
———, Salix in P. C. Stanpey, Flora of Glacier National Park, Contrib. U-S. 
Nat. Herb. 22:319-324. 1921. 
, Salix in Cuas. C. Dean, Trees of Indiana, revised ed., pp. 34-45. Pls. 
IO-I4. 1921. m 
Botanical Gazette, vol. 72] 220 
