400 DESCRIPTIONS OF NEW SPECIES 
Has. In the Rocky Mountains, Lewis’ River, by ponds, or in depressions. About six or eight 
inches high. Leaves about a quarter of an inch wide, the upper ones simple, all acuminate; an 
inch or more long. Raceme few flowered; flowers sessile, exterior sepals ovate. Some plants 
with the flowers apparently all feminine, others all rhaseuline, and a third set have about ten tubular, 
hermaphrodite florets, and three or four female ones, all smooth. 
Artemisia longifolia, (Nur. Gen. Am.) In this species, which is wholly 
rba ceous, the leaves are long, linear and acuminate, Be on the margin, 
tomentose beneath ; though ion entire, they are also as off en trifid, or forked 
towards the summit, the central segment, also, now and then subdivided; the 
segments all linear, about half a line wide; the simple leaves not apparently 
nerved. 
Pi 
Artemisia Ludoviciana, (Nutr. Gen. Am.) 
Has. Along the plains of the Platte, to the Rocky Mountains. From half a foot to three or four 
feet high; herbaceous, whitely tomentose on both sides; the lower leaves laciniated, lanceolate, 
upper entire; capitulum roundish-ovate. 8. * Jatilobas leaves tomentose, whitely so beneath, the 
lower dilated and pinnatifidly lobed, the upper trifid and cuneate, uppermost, oblong-lanceolate, 
rather acute; flowers. in a close, narrow panicle, sessile ; capituli globose-ovate, tomentose, the 
inner scales scariose ; florets numerous, smooth, apparent y polygamous.—Has. With the above, 
in the Rocky Mountains: if not the 4. cana of Pursh it may perhaps prove new. I have seen a 
second specimen in Dr, ‘Torrey’s herbarium, which differs in being less tomentose above. 
Artemisia * heterophylla; stem stout, and herbaceous; capituli and the upper 
surface of the leaves smooth; leaves long lanceolate, acuminate, irregularly and 
sparingly laciniate, above entire, beneath whitely tomentose; capituli com- 
poundly and closely paniculate, ee and small; sepals oblong, sca- 
riose, few-flowered. 
Has. In the Rocky Mountains, by streams. A tall plant, somewhat allied to 4. vulgaris, but 
still more to 4. integrifolia. Remarkable for its small, sessile, erect capituli, which are very 
reeset the plant i is hao oe three or four feet high. 
“Artemisia * incompta; herbaceous; smooth, except the under surface of the 
leaves, which is a little tomentose; leaves almost simply pinnatifid, trifid or 
laciniate, sessile, the segments rather broad, linear and acute; flowers panicu- 
lated; capituli subglobose, pedicellate, erect; sepals ovate and scariose; florets 
numerous, smooth. 
itn the central chain of the Rocky Mountains, in Thornberg’s Pass, near the great p passage 
ains of the Oregon. At first sight it somewhat resembles some variety of Eps ‘vulizeteh 
“but is very distinet. Remarkable for its smoothness. Height one to two feet; segments of the 
leaves a line wide. 
