Rvdberg: Studies on the Rocky Mountain Flora 272 



aments 3-4 cm. long at the ends of short leafy branches : bracts 

 yellow, oblanceolate, deciduous, acute, 2-2.5 ^^- long- rather 

 sparingly silky-villous : pistil green, about 4 mm. long, glabrous- 

 except the swollen portion at the end just below the red stigma: 

 stipe about i mm. long : style none : stigma minutely 4-lobed : 

 fruit glabrous, narrowly ovoid-conic, about 6 mm. long, and 1.5 

 mm. in diameter : staminate aments 2-3 cm. long, 5 mm. in diam- 

 eter : bracts like those of the pistillate aments, but more obtuse 

 and more villous : stamens 2, about twice as long as the bracts : 

 filaments slightly hairy, especially below. 



This species is a member of the longifolia group and nearest 

 related to .S". exigjia Nutt., at least as understood by Professor 

 Rowlee ; but differs in the narrower leaves, the distinct stipe and 

 the peculiar swelling just below the stigma. It grows on river 

 banks up to an altitude of 2500 m. 



Colorado: Cuchara River, below La Vcta, 1900, Rydberg & 

 Vreeland, 6jp2 (staminate flowers) and 6jpj (pistillate, type) ; 

 Mancos, 1898, Baker, Earlc & Tracy, 12 j (staminate) and 102 

 (pistillate in fruit). 



New Mexico: 185 1-2, Wright, 1874 and iSyj ; 1847, Feitd- 

 Icr, 813. 



Arizona: San Francisco Mountains, 1881, Rusby, jyi. 



Salix padifolia sp, nov. 



A shrub 1-7 m. high, with light brown smooth bark. Young 

 twigs strict, glabrous and shining, yellow, or often brown or purple : 

 stipules ovate or rounded, glandular-dentate : leaves with petioles 

 5 8 mm. long ; blade oval or broadly elliptic, crenate, short-acute 

 or obtusish, rounded at the base, 3-5 cm. long, 1.5-2 cm. wide, 

 when young sparingly covered with silky hairs, but soon glabrate, 

 dark green above, paler beneath : pistillate aments 3-4 cm. long, 

 densely flowered, appearing usually before the leaves, borne on 

 very short branches and subtended by 1-4 small leaves : bracts 

 obovate, fuscous, covered on the outside with white wool : pistils 

 nearly sessile, glabrous : style about 1.5 mm. long : stigmas 2, 

 nearly i mm. long, 2-cleft : capsules ovate-conic, about 6 mm. 

 long: staminate aments almost sessile, 2-3 cm. long, 10-12 mm. 

 in diameter : bracts as those of the pistillate aments : stamens 2; 

 filaments glabrous. 



This is a species of the cordata group and nearest related to 

 5. Mackenziana ; but differs in the shorter oval leaves, the shorter 

 and thicker aments and the exceedingly short stipes. It has gen- 



