560 
CREPIS OCCIDENTALIS Nutt. 
Plant perennial, 8 to 25 (rarely 40) em. high; stems single or sometimes two or 
three from a single caudex, corymbosely branching above, rarely from near the base, 
bearing like the leaves a close tomentum (this often thin and sometimes with a 
tendency to fall in age), often with glandular bristly hairs above, particularly on the 
peduncles; leaves from runcinately toothed to deeply pinnatifid (especially the cau- 
line), the lobes in the latter case oblong to linear and often themselves toothed; 
involucre 12 to 16 mm. long, calyculate, tomentose like the leaves and stem, and often, 
like the peduncles, bearing a few short glandular bristles; achenia from orange to 
brown in color, 8 to 10 mm. long, fusiform, truncate at the apex, 10- to 18-costate, 
minutely strigose, especially toward the apex between the cost. PLaTE XXI. 
In its normal form C. occidentalis, the most widely distributed of the seven species 
discussed in the present paper, is a tomentose plant with glandular-hirsute inflores- 
cence, 15 to 25 em, high, but in stature it often varies beyond these limits. It is 
essentially a plant of the Great Basin region, in drier and more exposed areas becom- 
ing more tomentose and less glandular-hirsute (as in Hillman’s specimens from Reno, 
Nevada), and in the western extensions of its range, where it penetrates the Sierra 
Nevada and Cascade Range toward the milder Pacific Coast climate, losing to some 
extent its tomentose character, as illustrated by Suksdorf’s specimens from western 
wlikitat County, Washington, and Rattan’s plant from the coast ranges of California. 
SYNONYMY, 
Crepis occidentalis Nutt. Journ, Acad. Phila. vii, 29 (1834). Type specimen in the 
Harvard University Herbarium, collected ‘on the borders and in the vicinity of the 
river Columbia” by Nathaniel B. Wyeth. This single specimen, from which Nuttall 
drew his description, is without basal leaves and has corollas yet unopened. It 
furnishes, therefore, no achenium characters. The involucral bracts and peduncles 
bear a few glandular bristles scattered through the tomentum. A plant collected by 
Thomas Howell in ‘rocky places, eastern Oregon” (No. 140), and distributed as 
Malacothrix crepoides, exactly resembles in size, pubescence, and other characters 
Nuttall’s type specimen, and is from the same region. 
Psilochenia occidentalis Nutt. Trans. Amer, Phil. Soc. ser. 2, vii, 437 (1841). Type 
specimen in the Harvard University Herbarium, collected on the Platte River, prob- 
ably toward its headwaters in Wyoming. The specimen itself is marked “R. Mts.,” 
i.e., Rocky Mountains; but the name of the collector, presumably Nuttall himself, is 
not given. Specimens exactly resembling Nuttall’s plant in all its characters, but 
larger and more fully developed, were collected in the year 1864 in Middle Park, 
Colorado, by C. C. Parry. 
Crepis occidentalis costata Gray, Bot. Cal. i, 485 (1876). Type specimen in the 
Harvard University Herbarium, collected on Stansbury Island, Great Salt Luke, 
Utah, by Sereno Watson, in June, 1869 (No, 715, King Survey). This is a robust 
plant, about 20 em. high, with spreading, stout branches, large leaves, and unusu- 
ally glandular inflorescence, and bearing mature achenia in which the cost are 
fully developed. This plant was again collected in 1883, at the same place, by 
Thomas Meehan. 
SPECIMENS EXAMINED, 
British Columbia: 
Spences Bridge, James Fletcher, 1885. 
Kamloops, John Macoun, 1889. 
Washington: 
“Columbia River,” N. B. Wyeth. 
Whitman County, Wawawai, “ V. Piper, 1894 (No. 1784). 
Klikitat County, near Lyle, W. N. Suksdorf, 1886 (No. 875); near Cleveland, W. N. 
Suksdorf, 1884 (No. 381), The former possibly Crepis bakeri, but with acute 
leaf-lobes. 
