COULTER AND ROSE—-NORTH AMERICAN UMBELLIFERAE. 175 
oréppa, seed, referring to the narrow and deep sulcus of the seed 
face. 
Type species, Cymopterus longipes Watson, Bot. King Surv. 124. 
1871. 
A group of 9 species, ranging from Idaho to southern California in 
the Great Basin region. 
The genus Cymopterus, with its thick corky wings and very flat seed with plane 
face, is very different from Aulospermum, whose closest affinity is with Ptery.ia, 
from which it differs chiefly in its less flattened seed with usually narrow and deep 
sulcus, and in general in its leaf habit. 
The cluster of pinnate leaves and peduncles borne at the summit of a more or less 
elongated stem, which is conspicuously sheathed at base. 
Flowers yellow. 
Involucre wanting .....----------------------------+-+-------- 1. A. lorgipes. 
Involucre resembling the involucels ......---.---------------- 2. A. glaucum. 
Flowers white. 
Scabrous puberulent .......----.------------------------------ 3. A, watsoni. 
Glabrous and glaucous .......----------------++---+----------- 4. A, ibapense. 
Leaves clustered at base. 
Wings much thickened at insertion. 
Flowers greenish yellow; fruit 10 mm, long......--------- 5. A, panamintense. 
Flowers purple; fruit 6 to 8 mm. long. 
Foliage glabrous.........---------------- -------+-------+------ 6. A. jonesii. 
Foliage with fine rough pubescence......---.-------------- 7. A. cinerarium. 
Wings thin at insertion. 
Leaves twice or thrice pinnate. .......---.------------------ 8. A. purpureum. 
Leaves pinnate, with lobed or divided pinne .......-.------------ 9. A, rose. 
1. Aulospermum longipes (Watson) C. & R. Fig. 52. 
Cymopterus longipes Watson, Bot. King Sury. 124. 1871. 
Glabrous and glaucous; leaves pinnate to bipinnate, the ultimate seg- 
ments oval and mucronulate; fruiting peduncles longer than the leaves 
10 to 25 cm. long; umbels 5 to 10-rayed, with no involuer e, and invo- 
lucels of subulate acuminate bractlets; rays 12 to 4¢ mm. long; pedi- 
cels 4 to 6 mm. long; fruit 6 to 8 mm. long, the 5 carpel wings 
broad and thin, somewhat unequal; oil tubes 3 in the intervals, 6 on 
the commissural side; seed face with deep and narrow sulcus, which 
broadens into a central cavity. 
Type locality, ‘* Wahsatch Mountains, near Salt Lake City [Utah], 
and on Antelope Island;” collected by Watson, no. 451, May, June, 
1869; type in U. S. Nat. Herb. 
Utah, northern Colorado, and southwestern Wyoming. 
Specimens examined: 
Uran: Wahsatch Mountains, Watson 451, in 1869; Captain Bishop 25,in 1872: 
Juab, Jones, April 3, 1880; Fairview, Jones 5554e, June 30, 1894, and 56276, 
July 13, 1894; Sandy, Jones, May 24, 1895; City Creek Canyon, Jones, April 
4, 1896. 
CoLtorapo: Yampa River, Routt County, Alice Eastwood, July 15, 1891. 
Wyomina: Piedmont, Uinta County, Nelson 4574, 4575, June 7, “808. 
