154 JOURNAL OF THE ARNOLD ARBORETUM [vol. i 



same place, date and colL (No. 653 fr.; A.; No. 661, fr. adult.; A.; ramulis pilosis, 

 probabiliter ad S. Barclayi referenda). 



3. S. monticola Bebb apud Coulter, Man. Rocky Mts. Bot, 336 (1885). 

 Ball ai)ud Coulter & Nelson, New Man. Rocky Mts. Bot. 134 (1909). 

 Wooton in Bull. New Mex. ColL Agric. i^xxvii. 46 (1913). — Rydberg, 

 Fl. Rocky Mts. 104 (1917), prob. tantum ex parte. — S. padifolia Rydberg 

 in Bull. Torr. Bot. Club, xxviii. 272 (1901), non Andersson. — S, pado- 

 phylla Rydberg, L c. 499 (1901), FL Rocky Mts. 194 (1917). 



Of these species I have seen the type mentioned below and the different 

 co-types in Bebb's herbarium. Ball was the first to recognize its wide dis- 

 tribution, I have tried to give its main characters in the key, but I think 

 that iS, monticola is one of those species which need careful observation in 



the field. Many specimens In the herbarium are easy to recognize, while 

 quite a number of them cannot be identified properly on account of the lack 

 of mature leaves or of flowering branchlets. Sterile specimens often are 

 similar to forms of other groups especially those of sect. Cordatae, In its 

 normal state the leaves are not large w^hile on offshoots they reach a great 

 size, and therefore may appear different. I believe that the following speci- 

 mens can be taken for typical S. monticola but some of them need further 

 observation- The enumeration of the specimens clearly shows the geo- 

 graphical distribution of the species, which probably occurs in other locali- 

 ties in the Rocky Mountains where the centre of its distribution seems to 

 be Colorado. Its northern limits are still uncertain, and I have seen speci- 

 mens of the northern Rockies as far as Alberta (Banff, Cave Avenue, July 4, 

 1891, J. Macoun [Nos. 40 and 41, fr,, st., C] ), which I am not able to de- 

 termine properly at present. 



Montana, Madison County: 10 mi. east of Monida, along a creek, June 18, 

 1899, A, & E. Nelson (No. 5427, f.; Cor., S., M., N.; 5446; f.; Cor., G.; the last one 

 has rather long pilose pedicels and may belong to a species of Sect. Cordaiae). 

 Flathead County: Columbia Falls, Juno 5, 1893; /?. S. Williams (No. 970, m., 

 f.; Cor.); Summit, G. N. Ry,, July 25, 1894, same coll. (m., fr.; Cor.). Gallatin 

 County r Bozeman, April 26, 1900» BlanJcinshtp (f.; Cor.). 



Southern Wyoming. Carbon County: Battle, Continental Divide, 3000 to 

 3500 in., July 17, 1891; F, Tweedy (No. 4534, fr.; N., W.). Albany County: 

 Medicine Bow Mts., Nasli's Fork, common, July 28, 1900, A. NeUon (No. 7781. 

 fr.; Cor.; "in clumps, 1.2 to 2.4 m. high"); Sand Creek, moist ground, very common, 

 May 30, 1900, same coll. (No. G964, fr., m. ; C, Cor., G., H., W.). Centennial 2700 m., 

 August 19, 1918, J. G, Jack (No. 1062, st.; A.; ^'bushes 3 to 3.0 m. high, bright yel- 

 low green branches"; forma porro observanda). 



NouTHEUN Wyoming. Eastern slopes of the Big Horn Mts., headwaters of Clear 

 Creek and Crazy Women River, about 2300 to 3000 m., July 20 to August 15, 1900, 

 F. Tweedy (No. 3428, st.; N.; forma incerta parvifolia). 



Colorado. Lari mer County : Estes Park, June 10, 1910, E. L. Johnston (No. 

 860, f. ; G., W.); same place, Thompson's River bank, August 11, 1910, same coll. 

 (No. 7GG, St.; N.; forma rnihi quamvis incerta); Chamber's Lake, about 3150 m., 

 July 13, 1896, C. F, Baker ([Rowlee 3], fr.; N.); Sheep Creek, above Campton's, 

 August 4, 1896, same coll. ([Rowlee l]st.; N.). Grand County: east of Middle 

 Park, Beaver Dam, 1861, C. C Parry (No. 342, m., f.; G.); on Grand River near Hot 

 Sulphur Spring. August 1, 1881, G. Engehnann (No. 5, st.; C, G.; "bark yellow, 



stem 1-U inch thick, 6-8 feet high, dcni^ely ccspitose bushes"); Middle Park, 



