62 Rydberg : Rocky Mountain flora 



oblanceolate, 1-2 dm. long, sinuately dentate, densely scabrous 

 with triangular teeth; upper stem-leaves lanceolate, long-acu- 

 minate, pinnatifid with lanceolate or rarely triangular lobes, the 

 lower ones of which are usually large and salient, the base of the 

 leaves, therefore, being very broad and truncate; flowers diurnal; 

 their bracts narrowly linear, entire or with a few narrow lobes; 

 sepals 2-3 cm. long, lance-subulate, long-acuminate, light yellow, 

 about 5 cm. long; outer filaments slightly dilated, the rest fili- 

 form, three fourths as long as the petals; petaloid staminodia none; 

 capsule 4 cm. long, i cm. thick; seeds obovate, winged. 



This species has been confused with A^. laevicaulis (Hook.) 

 Greene, but differs in the pubescent, duller stem (in N. laevicaulis 

 this is glabrous or with a few scattered stiff hairs, very white and 

 shining), broader petals, more deeply divided upper stem-leaves, 

 which are characterized by their acumination and broad almost 

 subhastate bases. A'^. acuminata extends farther eastward and 

 northward than A'', laevicaulis and is lacking in California. 



Idaho: Spokane River, Kootenai County, 1892, Sandherg, 

 MacDougal &' Heller 6ji (type, in herb. N. Y. Bot. Card.) ; Palouse 

 County and Lake Coeur d'Alene, Aiton 6015. 



Montana: Emigrant Gulch, 1897, Rydberg & Bessey 4546; 

 Sedan, 1902, W. W. Jones; Garrison, 1895, Rydberg 2737, and 

 C. L. Shear 5248; Helena, 1892, Kelsey. 



Wyoming: Betw^een Sheridan and Buffalo, 1900, Tweedy 3617; 

 Gardiner River, 1899, Aven Nelson & Elias Nelson 6000. 



Utah: City Creek, 1883, Leonard 116 and 227; Beck's Hot 

 Spring, 1905, Garrett 15Q5; Antelope Island and Stansbury Island, 

 Stansbury. 



Washington: Loon Lake, 1897, Winston; Spokane, 1902, 

 Kraeger j2g. 



ONAGRACEAE 



Boisduvalia salicina (Nutt.) Rydb. 



Oenothera densiflora /3 T. & G. Fl. N. Am. i: 505. 1840. 

 Oenothera salicina Nutt. in T. & G. loc. cit., as a synonym. 



This is quite different in habit from the typical B. densiflora 

 (Lindl.) S. W'ats., having the foliage-leaves narrow, linear or linear- 

 lanceolate. It has a much more northern and eastern range, 

 extending into British Columbia and Idaho. 



