ACHILLAEA MULTIFLORA HOOK 297 
pubescentia, bracteis carina viridi flavido-fuscis. Flores radiati 
5-7, involucro multo breviores, albi, parvi, 1-1.5 mm. longi, 
I.5-2 mm. lati, 3—-lobati, lobo medio minimo. Planta odorem 
aromaticum mitem emittens. 
Perrennial from a short rootstock. Stems solitary or some- 
times two, usually simple up to the inflorescence (but occasionally 
divided near the base in 2 or even 3 main branches), corymbosely 
branched above, 0.6-1 m. high, loosely woolly, the more so on 
ridges decurrent on both sides of the bases of the leaves. Leaves, 
basal and those lower of the sterile shoots petioled, those of the 
stem sessile, numerous, linear or narrowly linear-lanceolate, 2—10 
em. long, 0.5-1 cm. wide, on the sterile shoots glabrate, on the 
fertile plants loosely lanate on the upper side, more densely so 
on the lower, with a tendency for becoming more or less smooth, 
pinnately cleft, with the lobes again secondarily cleft in spinulose- 
dentate lobes of variable size. Inflorescence a compound corymb, 
flat-topped or usually with the peripheral branches from its lower- 
most leaf-axils rising considerably higher above the central ones, 
its branches being stiff and stout. Heads numerous, 7 mm. high, 
4mm. wide. Involucre 4 mm. high, 4 mm. wide, broadly campan- 
ulate, pubescent, its bracts yellowish-brown with green keel. 
Rays 5-7, very much shorter than the involucre, white, small, 
I-1.5 mm. high, 1.5—2 mm. wide, 3—lobed, the middle lobe smallest. 
The plant has a faint aromatic odor. 
The first time the writer noticed this plant in the Turtle 
Mountains was on July 7, 1910. I found two plants, both of them 
sterile, “‘fern-like’’ shoots. A thorough search for the fertile plant 
was futile. On July 29, 1910 and on June 4, 1911 I secured one 
shoot at a time. My first successful find was unexpected. On 
May 26, 1912 I drove on a mountain road to Fish Lake (altitude 
2600 feet), and from the carriage I perceived a stiff, cinnamon- 
colored plant about a meter. high, in a distance. I told the driver 
to stop the team and went for it. At last I had found my plant, 
bearing a small green shoot and the faded stem and inflorescence 
from last year, the persistent disks furnishing the bright color. 
If it had had the dull, ashy gray color characterizing the faded 
involucres of A. Muillefolium or A. lanulosa, it would not have 
attracted my attention. Now I had an unmistakable clue, and 
on August 22, 1912, I at last collected the flowering plant in the 
vicinity of St. John, Rolette County. 
