174 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
bels with unequal rays, no involucre, and involucels of several linear 
bractlets; rays 4 to 12 mm. long; fruiting pedicels 38 mm. long; flow- 
ers white; fruit nearly orbicular, 4 mm. long, each carpel with usually 
5 more or less undulate wings. 
Type locality, ‘* Hills of Bear River [southern Idaho], in the Rocky 
Mountain range;” collected by Vuttall; type in Herb. Philad. Acad. 
In the Yellowstone National Park and adjacent Idaho, Wyoming, 
and Montana. 
Specimens examined: 
Ipano: Type specimens as cited under type locality. 
Wyomina: Northwestern Wyoming, Rose 533, September 7, 1893. 
Montana: Near Red Lodge, Rose 48, July, 1893. 
The specimens collected by Rose match exactly with Nuttall’s type and with a 
Nuttall specimen in the Gray Herbarium. 
51. AULOSPERMUM ©. & R., gen. nov. 
Calyx teeth evident. Fruit oblong to orbicular in outline, glabrous, 
Fie, 52.—Aulospermum longipes: a, b, x 8. 
Carpel with 8 to 5 usually broad wings, which are very thick at inser- 
tion or not at all, and with narrow or broad intervals. Stylopodium 
wanting. Oil tubes several in the intervals (solitary in A. jonest2), two 
or more on the commissural side. Seed not dorsally flattened or but 
slightly so, the face usually with a narrow and deep sulcus. 
Caulescent or acaulescent plants, with more or less pinnately dis- 
sected leaves (or primary division ternate), mostly no involucre, invol- 
ucels of small narrow bractlets, which are not at all hyaline, and 
white, yellow, or purple flowers. Name from avdos, groove, and 
