336 BOTANICAL GAZETTE [april 



August 30, 1871, Coulter (no. 5, st.; C; forma porro observanda) ; Carbon 

 County, near Red Lodge, July 28, 1893. /. N. Rose (no. 50. fr. adult.; forma 

 aliquid incerta); Gallatin County, Bozeman, Gallatin River, low ground, 

 October 4, 1905, /. W. Blankinship (no. 465, St.; A.; forma incerta ad 5. 

 longifoliam pedicellatam spectans) ; Rosebud County, Forsyth, north of town, 

 toward river, 1908, C. R. Ball (no. 1305, St.; G.; "6 ft. high"; forma porro ob- 

 servanda). — Utah: Cache County, Logan Canyon, above Logan, August 8, 

 1914, C. R. Ball (no. 1864, fr. ; W.; forma glabra pro 5. exigua determinata, 

 porro observanda). 



This variety needs further observation in the field, and some of 

 the specimens cited are uncertain owing to the lack of fertile 

 material. Some forms of S. longifolia pedicellata are extremely 

 alike, but the leaves show a more or less prominent (often very fine) 

 venation, while in the leaves of var. tenerrima the lateral veinlets 

 are scarcely visible and finely impressed; the fruits of both are 

 sometimes almost identical, and I am not yet sure of the true 

 affinity of var. tenerrima. G. J. Jack, August 16, 1918, collected 

 on the Laramie River, Laramie, Albany County, Wyoming 

 (no. 1017), sterile specimens of a form of which I am not sure 

 whether it is var. tenerrima or var. pedicellata, neither of which has 

 hitherto been reported from southeastern Wyoming. Professor 

 Jack says: "Slender, coarse, grasslike, 2-3 ft. high, covering wide 

 sandy areas," and he told me that it is a very distinct low form. 

 There are now living plants in the Arnold Arboretum which I hope 

 will prove useful in determining its real afiinity. 



There is still one form which needs a few words. It was col- 

 lected by S. M. Tracy and F. S. Earle in western Texas, Jeft" Davis 

 County, Limpia Canyon, April 24, 1902 (no. 210, fr. ; C, G. ; dis- 

 tributed as " 5. longifolia opaca Ands."), and it seems to be 

 identical with Mexican specimens mentioned by me in Box. Gaz. 

 65:23. 1918, under 5. taxifolia. The habit and the leaves agree 

 well with those of that species, but the fruits in no. 210 are much 

 more like those of 5. exigua with short sessile stigmas. It looks 

 almost like a new species closely related to S. exigua, which 

 seems to show a variability remarkable even among willows. 



7. S. MELANOPSis Nuttall, N. Am. Sylva 78. pi. 21. 1843; 

 Rowlee in Bull. Torr. Bot. Club 27:256. pi. g, fig. 16. 1900, pro 

 parte; Piper and Beattie, Fl. Palouse Reg. Wash. 53. 1901; Piper 

 in Contr. U.S.N. Herb. 11:213 (Fl. Wash.). 1906, pro parte; Ball 



