400 DESCRIPTIONS OF NEW SPECIES 



Hab. 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 masculine, and a third set have about ten tubular, 

 hermaphrodite florets, and three or four female ones, all smooth, 



Artemisia longifolia, (Nutt. Gen. Am.) In this species, which is wholly 

 herbaceous, the leaves are long, linear and acuminate, revolute on the margin, 

 tomentose beneath; though often entire, they are also as often 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. 



Artemisia Ludoviciana, (Nutt. Gen. Am.) 



Hab. 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. /3. '^latiloha; 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, apparently polygamous. — Hab. With the above, 

 in the Rocky Mountains: if not the .5. cana of Pursh it may perhaps prove new. I have seen a 

 second specimen in Dr. Torrey's herbarium, which difl"ers in being less tomentose above. 



Artemisia ^heterophjlla; 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, cylindric-ovate, and small; sepals oblong, sca- 

 riose, few-flowered. 



Hab. In the Rocky Mountains, by streams. A tall plant, somewhat allied to A. vulgaris, but 

 still more to ^. integrifolia. Remarkable for its small, sessile, erect capituli, which are very 

 numerous; the plant is also gigantic, 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. 



Hab. In the central chain of the Rocky Mountains, in Thornberg's Pass, near the great passage 

 to the plains of the Oregon. At first sight it somewhat resembles some .variety of Jl. vulgaris, 

 but is very distinct. Remarkable for its smoothness. Height one to two feet ; segments of the" 

 leaves a line wide. 



