523 



Betula glandulosa Mx. Fl. V>ov. Aujct. ii, l!St) (18(i;i). 



A shrub 1 t(j 1.5 iii. high. Roihlbrd, altitude 1,(500 ui., July 11' (No. 1007). 



Corylus rostrata Ait. Ilort. Kew. iii, 364 (1789). 



litre and there iu tlie hills, but not coiiimou: Elk Cauyon, altitude 1,200 m., 

 dune 29 (No. 1008). 



Ostrya virgiuiaua (Mill.) Willd. Sp. PI. iv, -109 (1805); Cariylnns rirfjiiiiaua Mill. 

 Diet. ed. 8, no. 1 U"68)- 



Among the foothills: Eapid City, altitude 1,000 ni., June 25 (No. 1009). 



Queicus macrocarpa Mx. Hist. Chen. Amer. ii, 2 (1801). 



In the foothills. In most places only shrubby, 3 to G ni. high, hnotty. On the 

 u|iper Squaw Creek, east of Custer, there Avere good-sized trees. Hermosa, altitude 

 1, 100 m., June 21 ; Elk Canyon, altitude 1,200 m., June 29 (No. 1010). 



At the lirst place specimens. occurred which had more narrowly lobed leaves and a 

 more straight and vigorous growth. Only young trees were seen (No. 1011). 



SALICACEiE. 



Salix bebbiana Sargent, Gard. A Fur. viii, 403 (1895); Salix roslrala Richards. 

 App. Frankl. Journ. 753 (1823), not Thuil. Fl. Par. 51(3 (1790), nor Schleich (1S07); 

 S. vayuna occidintalis Anders. Kougl. Akad. Stock. Forh. (1858), not S. occidenialls 

 Bosc. in Koch, Sal. Com. 1(5 (1828). 



A shrub 1 to 3 meters high. Custer, altitude 1,700 m., May 30 (No. 1012) ; June 6 

 (No. 1013). In fruit aud leaf: Elk Canyon, altitude 1,200 m., June 30 (No. 1016); 

 Hermosa, altitude 1,100 m., June 24; Custer, altitude 1,700 ni., August 16; Hot 

 Springs, altitude 1,100 m., August 7 (No. 1018). A few specimens with thick leaves 

 as in S. hnmilis and S. tristis were collected at Rochford, altitude 1,700 m., July 12. 

 Even these have been refterred to .S'. rostrata by Mr. Bebb (No. 1019). 



SaUx discolor Muhl. Neue Schrift. Gesell. Naturf. Freuude Berlin, iv, 234 (1803). 

 A shrub 2 to 8 m. high. Custer, altitude, 1,700 m., June 4 (No. 1014). 



SalLx cordata Muhl. Neue Schrift. Gesell. Naturf. Freunde Berlin, iv, 236(1803). 

 Near water: Custer, altitude 1,7(J0 m., June 4 (No. 1015); leaves, Lead City, alti- 

 tude 1,600 m., July 9 (No. 1017). 



Salix fluviatilis Nutt. Sylva, 73 (1842); S. loufjij'olia Muhl. Neue Scrift. Gesell. 

 Naturf. Freunde Berlin, iv, 236 (1803), not Lam. 

 K'ochford, altitude 1,650 m., July 11 (No. 1020). 



Populus tremuloides Mx. Fl. ii, 243 (1803). 



Common in the higher parts of the Black Hills. Custer, altitude 1,700 in., June 4, 

 female llowers (No. 1021). 



Populus deltoides Marsh. Arb. Amer. 106 (1785); /'. mouU'iJ'era Ait. Ilort. Kew. 

 iii, 406 (1809). 



Common in the foothills: Hot Springs, altitude 1,100 m., .June 17, iiuit; August 3, 

 leaves (No. 1022). 



One tree, with unusually narrow crown, was found in a canyon east of Hot Springs, 

 Augu.st 3. Of this all the leaves were longer than broad, cuneate at the base, with 

 long acumiuation and with larger teeth than usual (No. 1023). 



Populus acuminata Rydberg, Bull. Torr. Club, xx, 50 (1893). 



This is the same as No. 372 of my western Nebraska collection, but the leaves are 

 broader and with shorter acumination. Only three trees found, near Hot Springs, 

 altitude 1,100 m., August 3 fNo. 1024 ). 



Populus aiigustifolia James, Long Exped. i, 497 (1823). 



Common along Little Elk Creek, altitude 1,100 m., June 28 (No. 1025). 



