76 Trans. Acad. Set. of St. Louis. 



1891. — Bebb in Contr. U. S. Natl. Herb. 4:198. 1893. — Nelson, Prelim. 

 Fl. Wyo. 179. 1894. 



S. Nuttallii Sargent, Garden and For. 8 : 463. 1895. — Sarg., Silva 9 : 141. 

 pi. 482. 1896. 



Fairly common in its different forms thiroiighout the West 

 from New Mexico and California to and into the British pos- 

 sessions. Like its near relative, S. rostrata, it has the habit 

 of a tree rather than that of a shrub and, indeed, it attains a 

 height of seventy feet sometimes, according to Sargent. It 

 is grouped systematically with S. rostrata and 8. macrocarpa 

 by the following common characters : capsules tomentose, 

 pedicels slender, styles obsolete or none. To these may be 

 added filaments frequently pubescent. This seems to be con- 

 stant in S. macrocarpa^ general in 8. rostrata and less fre- 

 quent in the present species. Of the four staminate specimens 

 examined, one showed distinct pubescence, two a slight pubes- 

 cence of the extreme base, and one was wholly glabrous. 



There is some difference between the forms of the Rocky 

 Mts. and those of the coast region. For the greater part the 

 plant as found in the lower plains of the coast is referred to 

 the variety cajjreoides which is discussed below. The more 

 typical Jiavescens of the mountains has large, broad, fertile 

 aments, 1-^2 inches in length; capsules 3-5 lines long; ped- 

 icels about 1 line; scales obovate or narrower, densely villous, 

 sometimes dark only at the tip and along the nerves. 

 Nelson's 1255 is a variation of larger dimensions. The 

 mature aments are of only normal length but the buff capsules 

 are 5-6 lines long; pedicels comparatively short, less than 

 1 line; scales linear-oblanceolate, acute. 



Specimems examined. — Baker, Earle, and Tracy, 554, Pis. So. Colo., 

 1898. — Crandall, Fl. Colo., Larimer Co. Mts., Jly. 2, 1896. — Elmer, 84, Fl. 



"Whitman Co., Wash., 1897. — Engelmann, Rocky Mt. Fl., Colo. ( ), opp. 



Empire, Sept. 13, 1874. — Engelmann, Bard Creek, Empire, Aug. 6, 1874. — 



City Canon, near Salt Lake, Utah, June 29, 1880. — Hayden, ( ), Laramie 



Mts., Aug. 24 (1860?) . — Jones, Fl. Nev., Carson City, June 2, 1897.— Nelson, 

 Fl. Wyo., 74, 1894; 1255, S. macrocarpa, and 1586, 1895. — Pammel, 216, 

 PI. No. Colo., 1896. 



S. FLAVESCENS var. CArREOiDES (Auders.) Bebb. 



S. Jiavescens var. capreoides (Anders.) Bebb, Garden and For. 8:373. 

 1895. 



S. Scouleriana Barratt in Hook., Fl. Bor.-Am. 2: 145. 1838 (in part). 



