398 DESCRIPTIONS OF NEW SPECIES 
rather longer than the trifid summit; axills full of small leaves, at least before the flowering period; 
branches long and virgate. I have only seen winter vestiges of the flowers; these are apparently 
five or six in acapitulum. Leaves rather rigid. A shrub four or five feet high. 
Artemisia * trifida; h, canescently sericeous; leaves linear, trifid towards 
the summit, flat and obtuse, the upper ones entire; panicle simple, leafy ; flow- 
ers sessile, conglomerated ; capitulum small, cylindric-ovate ; outer sepals lanceo- 
late, pubescent, the inner oblong and scariose. 
Has. Plains of the Rocky Mountains and Oregon. A very dwarf species compared with the 
preceding, six or eight inches high; the leaflets are also broader} the flowering branches also cy- 
lindrie, and the capitulum smaller, but still larger than in A. Plattensis. From the plains of 
Lewis’ River, in the Rocky Mountains, I have a variety, 8. *rigida, in which the leaves are 
shining and silky, rigidly three-forked and acute; but of this I have no flowers. It is, perhaps, 
a distinct species. : 
Artemisia * arbuscula; dwarf and shrubby; canescently sericeous; leaves 
short, cuneate, trifid; segments oblong-linear, obtuse, flat, the lateral lobes 
sometimes bifid or trifid, uppermost simple; capituli racemose, globose-ovate, 
closely sessile, erect, solitary, or in three-flowered, pedicellated clusters; 
_ branches slender, outer sepals tomentose, the inner oblong and scariose; florets 
about ten, smooth. 
Has. On the arid plains of Upper California, on Lewis’ River. A very diminutive shrub, four 
to-six inches high, with a rather thick, woody stem; branches virgate. Allied to the preceding, 
but very distinct; the capituli twice as large, the leaves short, the limb longer than the undivided 
base, and the divisions much broader, &c. Allied to &£. mendozana. 
Artemisia * tridentata; h; canescently tomentose; leaves cuneate, three- 
toothed at the summit, upper ones entire and obtuse; flowers paniculate; capi- 
tulum sessile, ovate and tomentose, small; inner sepals scariose, linear-oblong. 
Has. Plains of the Oregon, and Lewis’ River. A low, but rather stout shrub, white with a 
close tomentum. Leaves rather more than an inch long, about two lines wide, more or less deeply 
three-toothed, sometimes entire, the upper ones always so. Panicle much branched, the flowers 
small. (I have not seen them in a perfect state, and therefore class this species by its apparent 
affinity wi the last.) Somewhat allied to 2. Chinensis. 
Artemisia Columliensis, (Nutr. Gen. Am.;) k; canescently tomentose ; leaves 
long : and acute, lanceolate-linear, all entire, not revolute, and equally pubes- 
, cent; panicle simple, subracemose; capituli ovate, erect, small, sessile; sepals 
tomentose, the outer lanceolate, the inner oblong, obtuse, scariose on the mar- 
gins; florets five to six, smooth. 
