Ball — Notes on Some Western Willoics. 79 



S. vagans var. rottrata (Richards.) Anders., Monog. Sal. 87. 1867. — 

 Andersson, DC. Prod. 16* : 227. 1868. 



S. livida var. occidentalis Gray, Man. Bot. 464. 1867 (ed. 5). 



S. Bebbiana Sarg., Gard. and For. 8:463. 1895. —Sarg., Silva 9:131. 

 pi. 477. 1896. 



The numerous large, elevated leaf scars, which have been 

 emphasized for this species, are very conspicuous on the 

 usually short branchlets. On slender vigorous shoots they 

 are often small or lacking. On the closely related S. Jiaves- 

 cens Nutt. and iS. macrocarpa Nutt. they are also large and 

 conspicuous though not usually so numerous. In most 

 western specimens the leaves are only sparsely downy above 

 and silky below, much less so than is common in eastern 

 forms. When dry the leaves often have a decided slaty-blue 

 color below. Petioles slender, ^ in. long. Stipules usually 

 fugacious. In Pammel's No. 198, Fl. Wyo., they are small, 

 polymorphous (semicordate), coarsely dentate, and silky; 

 numerous on the young leafy twigs. 



The staminate aments vary from ^-1 in. long, sessile or 

 short-peduncled, bracteate, yellow, slender until the long 

 capillary filaments become spreading. The filaments are, as 

 noted under S. flavescens, frequently pubescent at the base. 

 It was true in four of the seven staminate specimens examined, 

 as follows. — Pubescent: Baker, 6; Hall and Harbour, 522; 

 Heller, 3609; Jones, 1751. Glabrous: Elmer, 72; Jones, 

 5170; Nelson, 211. The Hall and Harbour specimen cited 

 above was a mature one from the Parry herb., la. State Coll. 

 The 522 in the Engelmann herb., Mo. Bot. Garden, is very 

 young and the filaments are glabrous. 



Specimens examined. — Baker, PI. No. Colo., (Rowlee 4, 6, S,) ( ), 



1896. — Baker, Earle & Tracy, 570, PI. So. Colo., ( ). 1898. — Brande- 



gee, 1010, 1012, S. livida vsiT occidentalis, Co]o. 1874; Colo. FL, Canon City, 

 1877. — Elmer, 72, Fl. Whitman Co., Wash. 1897. — Engelmann, H., Lieut. 



Bryan's Exped. ( ), Black Hills, Aug. 1, 1856.— Engelmann, G., Rocky 



Mt. Fl. ( ), Clear Creek above Empire, Aug. 4, 1874; No. 4, 7, Colo. 



1881.— Fendler, 815, PI. Novo-Mex. 1847. — Hall and Harbour, 322, Rocky 

 Mt. Flora, 1862. — Heller, 3524, 3609, N. Mex. PL, S. Nuttallii, 1897.— 

 Jones, I75i, Fl. Utah, 1880; 5i 76>, West. FL, 1894. — Nelson, 272, FL Wyo. 

 1894. — Pammel, 212, 213,214, '^15, PL No. Colo. 1896; 198,199,203, 

 211, VI. Wyo. 1897. 



