igig] SCHNEIDER— AMERICAN WILLOWS 327 



Jack and also by Rehder on Grant's Pass, Oregon. The female 

 plants show almost the same stigmas as in S. exigua, and S. argo- 

 phylla looks often quite intermediate between this species and S. 

 sessilifolia. 



So far as can be judged at present by the specimens enumerated, 

 its range seems to extend from Bonneville County in eastern Idaho, 

 along Snake River to Canyon, Washington, and Nez Perces coun- 

 ties, and into adjacent Washington (Walla Walla, Whitman, 

 and probably also Franklin and Lincoln counties) as far as 

 western Klickitat County, while in Oregon the species occurs in 

 Sherman and Wasco counties, the forms from Klamath and 

 Josephine counties being rather uncertain. The male specimen 

 from British Columbia cited later looks much like S. sessilifolia, 

 but Professor Piper, with whom I have had an opportunity to dis- 

 cuss the matter, believes it is better referred to S. argophylla for 

 geographical reasons. Only a close study in the field, especially of 

 the forms of southern Washington and northern Oregon in the region 

 of the Columbia and its tributaries, can elucidate the relationship of 

 5. argophylla with S. sessilifolia and the limits of their geographical 

 distribution. At present I can hardly do more than to indicate 

 what form has to be taken for Nuttall's S. argophylla, and how it 

 seems to be related to and connected with either S. sessilifolia or 

 S. exigua. It would be rather misleading to make too decisive 

 statements as long as one's information is merely based on 

 herbarium material. 



Specimens examined.— Idaho : Bonneville County: Idaho Falls, among 

 rocks, along river, luly 4, 1901, E. D. Merrill and E. N. Wilcox (no. 803, m.; 

 G.; "4-5 ft."); Canyon County: Falk's Store, slough and creek banks, alt, 

 660m., July II, 1911, A. Nelson and Macbride (no. 1057, fr.; G., M., St.); 

 along the river, same alt., June 7, 1910, /. F. Macbride (no. 228, m.; G., M., 

 St.); Caldwell, irrigation ditch, October i, 1910, C. R. Ball (no. 1705, fr.; W.; 

 " 10 ft. ") ; Washington County: Weiser, alt. 660 m., July 5, 1899, M. E. Jones 

 (no. 6554, f., fr.; W.); ?Nez Perce County: Clear Water River, June 18, 

 1894, L. F. Henderson (f., fr.,nonm.; W.; same as no. 2878 in C; forma satis 

 ad S. exiguam spectans). — Washington: Walla Walla County: Waitsburg, 

 June 24, 1897, R. M. Horner (R. 454, B. 451, m.; G., W.); Whitman 

 County: Wawawai, July 9, 1901, C. V. Piper (no. 3592, m.); same place and 

 collector, June 13, 1901 (no. 3595, m.); West Klickitat County: Columbia 

 River, damp or wet places. May 31, July 1884, W. N. Suksdorf (m., f., fr. ; C, 



