;88 Trans, Acad. Sci. of St. Louis. 



manu, 8, 1881; Rocky Mt. Flora, Clear Creek, Aug. 21, and Berthoud's 

 Pass, Aug. 13, 1874, — Fowler, Fl. Canad. 8. glauca var. villosa, Bamff. 

 1887. —Jones, 308, Fl. Colo. 1878. — Macoun, Herb. Geol. Surv. Canad, 

 S. glauca var. ri7Zosa, Bonapsrte R., B. C. 1889. — Pammel, 223, 224, PI. 

 No. Colo. 1896. —Pammel, 22oa, 225b, PI. Wyo. 1897. 



S. GLAUCA L. var. ? 



S. glauca var. pullata Anders., Watson in Surv. 40tli Par. 5 : 325. 1871. — 

 Porter and Coulter, Fl. Colo. 128. 1874. 



S. glauca L., Porter and Coulter, Fl. Colo. 128. 1874. 



S. glauca var. villosa Anders., Bebb in Bot. Calif. 2 : 89. 1880 (in part). — 

 Bebb in Coult., Man. Rocky Mt. Bot. 338. 1885 (in part). 



This, the prevailing form of S. glauca L., in the Eocky 

 Mts., is certainly not identical with the S. glauca of Europe. 

 It is, in fact, more nearly related to S. desertorum Richards, 

 than to S. glauca and, as has already been said, no rigid line 

 can be drawn between it and the first-named species. It has 

 small leaves, lanceolate or oblanceolate, 1-2 in. long, scarcely 

 larger than those of S. desertorum, more or less villous on 

 both sides, nerves not elevated below ; aments rather slender 

 and loose, ^-1^ in. long; capsules about 3 lines long; styles 

 entire or divided. True S. glauca of Europe has rather 

 broadly oblanceolate leaves, 1^-3 or 4 in. long; aments ^-1 in. 

 wide, loose, 1-3 in. long; capsules, when nearly mature, 4-5 

 lines long. Our Rocky Mt. form was included under jS. glauca 

 villosa Anders, by Mr. Bebb, but it is certainly not the 

 S. villosa Don described by Hooker (Fl. Bor.-Am. 2:144) 

 and later published by Andersson as jS. glauca villosa (Sal. 

 Bor.-Am. 22). That had long leaves and thick aments 2-3 

 inches long, being thus more closely related to the European 

 S. glauca, 



Andersson considered the jS. glauca of arctic North America 

 to be identical with the European species. This is probably 

 true. The description of the arctic form given in the Illust. 

 Flora fits the European species very well except for the cap- 

 sule *' 3 lines long,*' which is entirely too short, as I have al- 

 ready said. But, to repeat, the Rocky Mt. form of S. glauca 

 is quite difi'erent from the typical S. glauca of Europe 

 and therefore presumably also different from the S. glauca 

 of arctic America. The following specimens may be safely 

 referred to this form of S. glauca. 



