1git] NELSON—IDAHO PLANTS 269 
paler, pinkish or even white, on drying. GREENE is the only writer who has 
mentioned a western form (California) in which the petals remain yellow, or 
turn a deeper yellow, but he referred this to the misunderstood Oenothera 
grandiflora Ait., which Miss Vatt (Torreya 5:9. 1905) has since definitely 
located for us. It seems strange, however, that neither HowELL nor PIPER 
make any mention in their floras of the large-flowered species representes by 
this and the next. 
MacsrivE reports this species as scattering in the foothills but more abun- 
dant upon the adjacent mountain slopes, near Boise, Idaho; no. 262, June 18, 
IgIo. 
Onagra (OENOTHERA) Macbrideae, n. sp.—Annual, from a 
rather slender, vertical taproot: stem simple below or sometimes 
with one or two smaller accessory erect stems from the crown, 
usually sparingly branched above, 4-8 dm. high, glabrate in appear- 
ance but with a sparse crisped pubescence and a few longer cilia- 
tions: leaves glabrate or more evidently pubescent, especially on 
the midrib or veins which are often substrigose; the radical leaves 
narrowly oblanceolate, tapering above to the acute apex; cauline 
leaves similar but smaller and passing into the sessile bracts: 
inflorescence open from the first: calyx lobes nearly glabrous, about 
3cm. long, shorter than the glabrous slender tube, the linear tips 
short: petals yellow, thin, fading to a deeper yellow or orange red, 
obovate-obcordate, about 4 cm. long, twice as long as the filaments: 
anthers more than 1 cm. long: pistil not protruding from the bud, 
about equaling the petals: capsule moderately fusiform, nearly 
straight, and 8-costate, 2-3 cm. long: seeds apparently wing-angled. 
Two such splendid plants as these by one collector, seem quite an achieve- 
ment for one season. In so limited a genus, since both are from the same 
State, one might suspect that they should be united, but that is impossible, 
for one is a coarse, pubescent, spreading biennial with woody stems and crowded 
inflorescence: the other a glabrate, erect, herbaceous annual with few and 
much larger flowers. 
That this species is indigenous can scarcely be doubted, It was secured 
more than 50 miles from a railroad in a practically uninhabited desert area 
in the Owyhee Mountains, Idaho. It affords me much pleasure to dedicate 
it to Mrs. C. M. Macarme, who so industriously and discriminatingly assisted 
her son in the field work during most of the season of 1910. Type no. 473, 
Twilight Gulch, July 27, rg10. 
Dodecatheon dispar, n. sp.—Glabrous throughout, obscurely, if 
at all, granular-glandular in the inflorescence: rootstock short, thick, 
