34 Rydberg: Studies on the Rocky Mountain Flora 



ceolate in outline, tapering at both ends, often 2 dm. long : the 

 upper lanceolate with a broad base : all pectinately laciniate with 

 linear-oblong divergent obtuse lobes ; hypanthium cylindrical, 

 15-18 mm. long; sepals ovate- lanceolate, acute, 4-5 mm. long: 

 petals obovate, light yellow, about 8 mm. long : seeds irregularly 



mu 



This species is perhaps nearest related to M. albicauhs, but 

 differs in the large size of the plant, the diffuse habit, and the larger 

 flowers. It was collected on railroad banks and in loose barren 

 soil on hillsides, at an altitude of 1800-2 100 m. 



Colorado : On Cucharas River, below La Vera, 1900, Rydberg 

 & Vredand, 5769 (type) ; near Walsenburg, 3768. 



Impatiens aurella sp. nov. 



A slender glabrous annual, about 6 dm. high. Petioles 1.5 — 3 

 cm. long : leaf-blades ovate or oval, thin, bright green, a little paler 

 beneath, 4-5 cm. long, coarsely toothed, acute ; teeth and apex 

 finely mucronate : peduncles ascending, mostly 2-flowered : bracts 

 minute, linear, about 2 mm. long : flowers orange, not mottled : 

 sack conical, about 1 cm. long and 6 mm. broad at the base ; its 

 spur recurved, about 8 mm. long. 



This is nearest related to /. biflora, but differs in the much 

 smaller flowers, which are scarcely more than half the size of that 

 species and without any spots, the comparatively longer spur and 

 less pale leaves. It grows in swamps at an altitude of about 600 m. 



Idaho : Priest River, 1900, D. T. MacDougal, 20. 





Geranium nervosum sp. nov. 



A 



tall perennial with thick root and short caudex. Stems 4-8 

 dm. high, minutely retrorsely strigose, in age more glabrate : basal 

 leaves with petioles 2-4 dm. long ; blades reniform in outline, 8- 

 12 cm. in diameter, finely strigose on both sides, divided to near 

 the base into 5-7 obovate -cuneate or oblanceolate-cuneate divisions 

 which are again 2-3-cleft and coarsely toothed : stem-leaves none, 

 except those subtending the inflorescence ; these sessile, 3-5 -cleft ; 

 branches of the cymes and calyx very densely glandular pubes- 

 cent : sepals oval, 8-9 mm. long, terminated by a filiform tip, I- 

 2 mm. long : petals broadly obovate, 15-18 mm. long, pale violet 

 or almost white, with dark purple streaks : carpels as well as their 

 column densely glandular ; the latter nearly 2 cm. long : style be- 

 yond the column about 5 mm. : seeds glabrous, minutely reticulate. 



This species is somewhat intermediate between G. viscosissimum 



