212 Charles V. Piper. 
217. Artemisia atomifera Greenman, |. c., p. 588. 
Cespitose, often in large clumps; stems suffru. scent, mostly simple 
up to the inflorescence, 60 to 120 cm high, coarsely striate, canescent 
or glabrate; leaves numerous, subsessile, firm, and rather rigid, green 
and nearly glabrous above, speckled with numerous white resinous atoms, 
closely white-tomentose beneath, excessively variable as to form, either 
all lanceolate and entire or all dentate or laciniate, or the larger ones 
5 to 7-pinnately divided with narrow lobes, usually the upper ones entire, 
the lower variously dentate or lobed, commonly 2 to 6 cm long; panicle 
oblong or somewhat pyramidal, 10 to 20 cm long, more or less leafy- 
bracted, the heads glomerate or spicate on the ascending branches; in- 
volucre campanulate, canescently tomentose, more or less atomiferous 
like the leaves, 2 to 4 cm high, bracts about 10, ovate, obtuse; flowers 
10 to 25 in each head; mature akenes linear-oblong, glabrous, destitute 
of pappus. 
A species with the habit and appearance of A. ludoviciana Nutt., to 
which it is clesely allied, but apparently well marked by the peculiar 
atomiferous character of the upper leaf surface. The odor is decidedly 
more pungent than that of A. ludoviciana. I have never met the species 
except in Snake River canyon at Wawawai and Almota. 
The type, in the U. S. National Herbarium, is my no. 6466 from 
Wawawai, a good series of which shows the variability of the foliage. 
Other specimens were collected at Wawawai July 19, 1892, and at Al- 
mota under no. 2321. 
218. Senecio Harfordii Greenman, |. c., p. 597. 
Glabrous or essentially so throughout; stem erect or ascending from 
a slender rootstock, 2 to 5 dm high, somewhat glaucous, usually leafy; 
leaves mostly pinnately divided, with irregularly lobed divisions, and 
these in turn dentate, including the petiole 4 to 14 cm long, 1 to 5 om 
broad, thin in texture, and drying pale green; the lowermost leaves often 
undivided, rotund and erenately lobed; uppermost leaves epetiolate: in- 
florescence a terminal corymbose cyme, few to many- (2 to 30-) headed: 
heads mostly less than 1 cm high, including the rays 1,5 to 2 cm in 
diameter; involuere shorter than the flowers of the disk; braets of the 
involuere about 13, narrowly lanceolate, 5 to 5,5 mm long, acuminate, 
acute, glabrose; ray-flowers commonly 5; rays bright yellow; disk flowers 
18 to 25; achens 2,5 to 3,5 mm long, glabrous. 
Oregon: Rocky high lands, Cascade Mountains, May 31, 1869, W. 
G. W. Harford & Geo. W. Dunn 540 (hb. Gray), type; Rooster Rock, 
June, 1877, J. Howell (hb. Gray, and hb. Field Mus.); rocky banks of 
Columbia River, western Oregon, June, 1880. Thomas J. Howell (hb. 
Field Mus.); Bonneville, Multnomah County, July 17, 1885, W. N. Suks- 
dorf 572 (hb. Gray); Multnomah Falls, July 27, 1902, E. P. Sheldon 
11004 (hb. Gray), and at the same locality, June 25, 1904, C. V. Piper 
6212 (hb. Gray). 
Washington: On mountains near the Lower Cascades, May 29, 
1886, W. N. Suksdorf (hb. Gray); in woods, Lower Cascades, May 29, 
