BOTANICAL REPORT. 
445 
This is the “Wild Sage” of the Upper Missouri (above the mouth of the Yellow¬ 
stone) and the Yellowstone River, and of the Laramie Plains, but it does not seem to 
occur west of the Rocky Mountains, as Torrey and Gray (£. c.) already state, and 
Nuttall (l. c.) must have confounded it with other species, when he contends that it is 
“still more abundant on the barren plains of the Columbia River”, and that it grows 
6 to 8 or 12 feet high. 
Artemisia tridentata, Nuttall in Trans , Amer. Phil Soc. (n: ser.) 7, p. 398; Torrey 
and Gray, FI. 2, p. 418.—Trunk, bark, and wood very similar to that of the last species, 
but trunk often larger, and usually even more twisted and knotty, with very numerous 
short and stunted branches, which are repeatedly divided into a great many smaller 
branchlets; ultimate annual branchlets fascicled, erect, only 3-6 inches long, canescent 
or silvery, very leafy at base, rather naked upward, bearing strict, rather compact, pan¬ 
iculate spikes, composed of sessile or usually pedunculate spikelets or glomerules of 3 
to 6 or 8 sessile heads. Leaves silvery-white on both surfaces, crowded at the base of 
the branches, and often fascicled on short or stunted sterile branches, narrowly wedge- 
shaped, 1^—2 lines wide at the obtuse: tridentate or trilobed end, narrowed down into 
a more or less distinct petiole; usually 3-6, rarely 8, lines long. Inflorescence inter¬ 
spersed with short and narrow, undivided, cuneate or spatulate obtuse leaves. Heads 
of flowers narrow, obovoid, nearly lines long, not much more than half as wide, 
with short and obtuse, canescent, exterior scales, and longer, scarious, interior scales, 
ciliate on the sides. Flowers in some specimens 3, in others often 4-5 in each head, 
all perfect, scarcely more than 1 line long; ovary quite glandular and with the odor 
of turpentine. 
This is the “ Wild Sage” of Utah, and, perhaps, of the whole region west of the 
Rocky Mountains, where it seems to supplant the more eastern A. cana. Nuttall, who 
first described it, calls; it a shrub about a foot high, and as such it appears in the 
mountains of Colorado; but in ; Utah it is; the largest and most abundant species, 
usually 2-4 feet high, rarely attaining a height of 6 feet, and then not straight, and 
with trunks of 3-6 inches diameter; sometimes the smallest bushes have trunks fully 
as thick as .the tallest ones, short and; chunky. East of the mountains, in the range of 
A. cana, it ever remains an inconspicuous shrub, lost among the more common species. 
Near Camp Floyd, specimens were collected bearing white tomentose excrescences of 
the size of a pea, or larger, undoubtedly galls caused by the sting of insects; the same 
have been observed on this species in Colorado. 
The other species of; Artemisia, collected by the expedition were A. Canadensis , 
Michx., at Bridgets Pass; A. Ludomciana, Nutt., at Sweetwater, Bridgets Pass, Round 
Prairie, etc.; A, dracunculoides, Pursh, on the Sweetwater; and A. frigida, Willd., on the 
Upper Sweetwater River 
QHENOPODIACE^E. 
Sarcobatus vermiculatus, Torrey in Emory's Report (1848), p. 149. Batis (?) 
vermiculata, Hooker, Flor ; . Bor-Am. 2,p. 128 (1840); Sarcobatus Maximiliani, Wees in 
Pr. Maximil Trav. Engl ed. p. 518 {ex Torrey ), Seubert in Bot. Zeitung , 1844, p. 753, cum 
tab., Lindley in Hooker, Lond . Journ. Bot. IV, p. 1 (1845); Fremontia vermicularis, 
