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 a capitulum. Leaves rather rigid. A shrub four or five feet high. 



Artemisia ^trifida; h, canescently sericeous; leaves linear, trifid towards 

 the summit, fl.at 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. 



Hab. 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- 

 lindric, and the capitulum smaller, but still larger than in Jl. Plattensis. From the plains of 

 Lewis' River, in the Rocky Mountains, I have a variety, /3. *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. 



Hab. 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 Jl. 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. 



Hab. 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 

 afiinity with the last.) Somewhat allied to Ji. Chinensis. 



Artemisia Columbiensis, (Nutt. Gen. Am.;) h; 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. 



