84 Muhlenbergia, Volume 4. 
ceolate or oval, attenuate at both ends, acuminate, entire, plane, 
sparingly ciliate, green, striate with approximate lines, 5 lines 
long, a litie and more wide. Pappus sessile, white, plumose- 
serrate, equalling the disk corollas, 1-serial. Florets yellow, the 
tube pilose; disk hermaphrodite, 2 lines long (without the akene); 
limb turbinate, 5-toothed, the teeth short, lanceolate, subciliate; 
rays few, 8, ligulate, pistillate, without vestige of anthers; twice 
longer than the scales of the involucre, oblong, the apex obtuse, 
scarcely denticulate, 8-9-nerved, 7-9 lines long including the 
tube. Akenes (not yet mature) linear, angled, striate, glabrous, 
2 lines long. 
Differs from 4A. Chamtssonis Lessg. for the most part: 1) 
in the form and relative dimension of the leaves; 2) the involu- 
cre I-serial (not 2-serial) and in the few scales (not numerous; 3) 
the akenes glabrous (not pilose). 
\/ ACHILLEA BOREALIS 149. Stems teretish, sulcate, striate, 
villous with soft white hairs, a line and more in diameter. 
Leaves sessile, pinnatisect; segments bipinnatifid, the lobes lin- 
ear, acute, mucronulate, pubescent. Flowers corymbose, white, 
the size of those of A. atrata. Peduncles branched, villous-pu- 
bescent. Scales of the involucre imbricate, unequal, the outer- 
most ovate obtusish, the inner ovate-oblong, more acute, here 
convex, there concave, the midvein prominent, shorter than the 
disk flowers. Ray florets ligulate; the limb obovate, entire, 
4-nerved, twice longer than the tube, 2 lines long, and a line 
wide. Disk flowers tubular, subinfundibuliform, 5-fid; the lobes 
lanceolate, tube elongated, nearly as long as the akenes. Akene 
attenuate at the base, glabrous, nearly 3 lines long. Pappus 
none. | . 
The plant was collected by Kastalasky on the island of 
Sitka; but where it was not observed by Mertens. 
