523 
Betula glandulosa Mx. Fl. Bor. Amer, ii, 180 (1803). 
A shrub1 to1.5m. high. Rochford, altitude 1,600 m., July 12 (No. 1007). 
Corylus rostrata Ait. Hort. Kew. iii, 364 (1789). 
Here and there in the hills, but not common: Elk Canyon, altitude 1,200 m,, 
June 29 (No. 1008). 
Ostrya virginiana (Mill.) Willd. Sp. Pl. iv, 469 (1805); Carpinus virginiana Mill, 
Dict. ed. 8, no. 4 (1768). 
Among the foothills: Rapid City, altitude 1,000 m., June 25 (No. 1009). 
Quercus macrocarpa Mx. Hist. Chen. Amer. ii, 2 (1801). 
In the foothills. In most places only shrubby, 3 to 6 m, high, knotty. On the 
upper Squaw Creek, east of Custer, there were good-sized trees. Hermosa, altitude 
1,100 m., June 24; Elk Canyon, altitude 1,200 m., June 29 (No, 1010). 
At the first pluce specimens occurred which had more narrowly lobed leaves and a 
more straight and vigorous growth. Only young trees were seen (No. 1011). 
SALICACEA. 
> 
Salix bebbiana Sargent, Gard. & For. viii, 463 (1895); Salix rostrata Richards. 
App. Frankl. Journ. 753 (1823), not Thuil. Fl, Par. 516 (1790), nor Schleich (1807) ; 
S. vagans occidentalis Anders. Kongl. Akad. Stock. Férh, (1858), not S. occidentalis 
Bose, in Koch, Sal. Com. 16 (1828), 
A shrub 1 to 3 meters high. Custer, altitude 1,700 m., May 30 (No. 1012); June 6 
(No. 1013), In fruit and leaf: Elk Canyon, altitude 1,200 m., June 30 (No. 1016); 
Hermosa, altitude 1,100 m., June 24; Custer, altitude 1,700 m., August 16; Hot 
Springs, altitude 1,100 m., August 7 (No. 1018). A few specimens with thick leaves 
as in S. humilis and S. tristis were collected at Rochford, altitude 1,700 m., July 12. 
Even these have been referred to 8. rostrata by Mr. Bebb (No. 1019), 
Salix discolor Muhl. Neue Schrift. Gesell. Naturf. Freunde Berlin, iv, 234 (1803). 
A shrub 2 to 8m. high. Custer, altitude, 1,700 m., June 4 (No, 1014). 
Salix cordata Muhl. Neue Schrift. Gesell. Naturf. Freunde Berlin, iv, 236 (1803). 
Near water: Custer, altitude 1,700 m., June 4 (No. 1015); leaves, Lead City, alti- 
tude 1,600 m., July 9 (No, 1017). 
Salix fluviatilis Nutt. Sylva, 73 (1842); 8. longifolia Muhl. Neue Scrift. Gesell. 
Naturf. Freunde Berlin, iv, 236 (1803), not Lam. 
Rochford, altitude 1,650 m., July 11 (No. 1020). 
Populus tremuloides Mx. I'l. ii, 243 (1803). 
Common in the higher parts of the Black Ilills. Custer, altitude 1,700 m., June 4, 
female flowers (No. 1021). 
Populus deltoides Marsh. Arb. Amer. 106 (1785); P. monilifera Ait. Hort. Kew. 
iii, 406 (1809). 
Common in the foothills: Hot Springs, altitude 1,100 m., June 17, fruit; August 3, 
leaves (No. 1022). 
One tree, with unusually narrow crown, was found in a canyon east of Hot Springs, 
August 3. Of this all the leaves were longer than broad, cuneate at the base, with 
long acumination 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 (No. 1024). 
Populus angustifolia James, Long Exped. i, 497 (1823). 
Common along Little Elk Creek, altitude 1,100 m., June 28 (No. 1025). 
34 
