62 RypBERG: 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, 1 cm. thick; seeds obovate, winged. 
This species has been confused with N. 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. N. acuminata extends farther eastward and 
northward than N. laevicaulis and is lacking in California. 
_IpaHOo: Spokane River, Kootenai County, 1892, Sandberg, 
MacDougal & Heller 651 (type, in herb. N. Y. Bot. Gard.) ; Palouse 
County and Lake Coeur d’Alene, Aiton 6015. 
Montana: Emigrant Gulch, 1897, Rydberg & Bessey 4540; 
Sedan, 1902, W. W. Jones; Garrison, 1895, Rydberg 2737, and 
C. L. Shear 5248; Helena, 1892, Kelsey. - 
Wyominc: Between Sheridan and Buffalo, 1900, Tweedy 3617; 
Gardiner River, 1899, Aven Nelson & Elias Nelson 6000. 
Uta: City Creek, 1883, Leonard 116 and 227; Beck’s Hot 
Spring, 1905, Garrett 1595; Antelope Island and Stansbury Island, 
Stansbury. 
WasHINGTON: Loon Lake, 1897, Winston; Spokane, 1902, 
Kraeger 529. 
ONAGRACEAE 
Boisduvalia salicina (Nutt.) Rydb. 
Oenothera densiflora 8 T. & G. Fl. N. Am. 1: 50s. 1840. 
Oenothera salicina Nutt. in T. & G. loc. cit., aS a synonym. 
This is quite different in habit from the typical B. densiflora 
(LindI.) 5. Wats., having the foliage-leaves narrow, linear or linear- 
lanceolate. It has a much more northern and eastern range, 
extending into British Columbia and Idaho. 
