COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAE. 187 
3. Rhysopterus corrugatus (Jones) C. & R. 
Cymopterus corrugatus Jones, Am. Nat. 17%: 973. 1883. 
Leaves becoming 7 cm. long, with a more oblong outline, and more 
dissected; primary divisions or leaflets 5, basal pair the largest, ovate, 
pinnately 3 to 5-cleft, the ultimate divisions cleft and sharply toothed; 
umbels usually solitary and on longer peduncles, with involucels of 
ovate bractlets often cleft at apex into 3 long '!._ar lobes. 
Type locality, ** Rose Creek,” near Humboldt Lake, Nevada; col- 
lected by Jones, no. 3886, June 17, 1882; type in Herb. Jones, dupli- 
vate in U. S. Nat. Herb. 
Only known from the type locality. 
Specimens examined: 
Nevaba: Type specimens as cited under type locality. 
54. PS9EUDOCYMOPTERUS ©. & R. Rev. N. Am. Umbell. 20 and 74. 
1888. 
Calyx teeth evident. Fruit oblong, glabrous. Carpel with very 
prominent and acute (sometimes narrowly winged) dorsal and interme- 
diate ribs, and rather 
broad and thickish lateral 
wings (sometimes not 
much more prominent 
than the dorsals and inter- 
mediates), which are dis- 
tinct from those of the 
other carpel. Stylopodi- 
um wanting. Oil tubes L 
to 4 in the intervals, 2 to 
8 on the commissural side. 
Seed more or less fiat- 
tened, with plane face (Ox- Fig. 56.—Psendocymopterus montanus: a, x 6; b, x8, 
cept in P. bipinnatus). 
Caulescent or acaulescent plants, with bipinnate leaves, no involucre 
(very rarely a bract or two), involucels of mostly linear bractlets, and 
variously colored flowers. 
Type species, Thaspium(?) montanum Gray, Pl. Fendl. 57. 1849. 
A group of 4 species, belonging chiefly to the Rocky Mountains 
and extending from New Mexico and Arizona to Montana and eastern 
Oregon. 
Caulescent and slender; flowers yellow or purple .....------------- 1. P. montanus. 
Acaulescent and cespitose; flowers white or yellow. 
Leaves on long petioles and with pungently acute segments -.....- 2. P. anisatus. 
Leaves on short petioles, very pale or glaucous, not so pungent. 
Peduncles 3 to 5 em. long ...........---.-------------------- 3. P. hendersoni. 
Peduncles 10 to 20 em. long......---.----------------------- 4. P. bipinnatus. 
