273 Rvdberg: Studies on the Rocky Mountain Flora 



erally been referred to 5". cordata ; but has much thicker and 

 shorter ainents and the leaves are quite different, thin, very short 

 and broad, never acuminate and never sharply serrate. It grows 

 along streams at an altitude of 2000-3000 m. 



Colorado : Tributaries of Turkey Creek, 1900, Rydbcrg & 

 Vrceland, 6j8g (fruit, type); Ojo, 6j86 (staminate) and 6j8/ 

 ( pistillate ) ; Pass Creek, 6j88 ( pistillate ) ; Los Pinos, 1 899, Baker, 

 2^1 ; Bob Creek, ]Sg8, Baker, Earlc & Tracy, IJS ; Silverton, 

 1895, F. Tweedy, 268 ( ? ). 



Wyoming : Golden Gate, 1899, Avcn & Ellas Nelson, jS-fg. 



Montana : Ten miles east of Monida, 1899, Aven & Ellas 



Nelson, S427- 



Salix flava sp. no v. 



A shrub or small tree, 4—7 m. high, \vith grayish yellow rough 

 bark. Branches short and divergent, light yellow, smooth and 

 shining : stipules rounded, entire : leaves with petioles 2-6 mm. 

 long ; blades lanceolate, short-acuminate or acute, entire or indis- 

 tinctly crenulate, rather firm, yellowish green, glabrous on both 

 sides, ■^—y cm. long : pistillate aments 2-3 cm. long, almost ses- 

 sile, subtended by 1-2 leaves or naked : bracts very short, obo- 

 vate, fuscous, densely long-woolly : pistil stipitate, glabrous ; stipe 

 in fruit often 2 mm. long: style about .5 mm. long: stigmas ob- 

 long, subentire : capsule ovate, about 6 mm. long : staminate 

 aments 2—3 cm. long, sessile : bracts as in the pistillate aments : 

 stamens 2 ; filaments glabrous. 



This is also a member of the cordata group and nearest re- 

 lated to 5". hitca Nutt., differing in the less acuminate and suben- 

 tire leaves, which are not paler beneath, and the longer stipes. It 

 grows along streams at an altitude of i 500-2000 m. 



Wyoming: Green River, 1895, /?jv//w^ (type) ; Spread Creek, 

 1897, F. Tweedy, J02. 



Montana: Boulder River, 1888, F. Tweedy, 6j. 



Idaho: Beaver Canon, \?,g^, Rydbei-g. 



Nevada: Unionville, 1868, S. Watson, logy. 



Utah: Wahsatch Mountains, 1869, S. Watson, iog6, in part. 



Colorado : South Park, 1873,/. Wolfe ; Cucharas Valley, near 

 LaVeta, igoo, Rydbcrg & Vrecla)id,6j7j ; Manitou, 1878, J:/! E. 

 Jones, JO. 



Blitum hastatum sp. nov. 



A slender annual, 2—4 dm. high. Leaves very thin ; blades 



