AND GENERA OF PLANTS. 399 
Has, On the plains of the’Missouri, and along the Platte to the mountains. seit distinct 
from the .2. cana of Pursn. 
§. *Tanaceum.—Receptacle convex, pilose or lanigerous. Achenium acutely 
costate, terminated by a membranaceous, somewhat lobed margin.—Shrubs, 
with trifid or twice upadly pia dissected leaves. Capituli as in Abro- 
tanum. 
_ Artemisia Fischeriana, and variety 3. vegetior (of BESSER,) sachhig a dis- 
tinct species. — 
Has. The Bay of St. Francisco, Upper California. If the variety 8. agrees in the character of 
the receptacle with the species to which it is referred, I have not seen the plant. 
Artemisia * abrotanoides; »; canescent and pulverulently pubescent; leaves 
pseudopinnate towards the extremity, with a few (two pair) of filiform seg- 
ments; upper leaves entire; panicle simple; capituli hemispherical, large, 
nodding, on bracteolate pedicels; sepals oval, broadly scariose on the margin. 
Has. Near St. Barbara, Upper California, Receptacle somewhat pilose, A shrub with much 
the appearance of .2. 4brotanum. Common. Branches whitely canescent. 
g. ut. Aproranum. (Bess., Decand.) Flowers heterogamous, all fertile. 
Artemisia * pedatifida; very dwarf and suffruticose, somewhat canescently 
tomentose; leaves towards the summit trifid, or more or less subdivided into 
bifid, or trifid, linear, and very narrow segments; stems numerous, subcespi- 
tose, simple, terminating in a short, few-flowered spike; capituli ovate, sessile, 
subtended by simple or trifid leaves; inner scales scariose; florets smooth, about 
ten. 
Has. Arid plains of Lewis’ River, Rocky Mountains. Flowering in August. A very distinct 
and peculiar species, with a stout, woody, exfoliating root, sending out tufts of low stems, about 
three or four inches high, terminating in spikes of from about four to ten flowers; capituli towards 
the summit, conglomerated by threes; leaflets almost filiform-linear, but flat, often only trifid, but 
also with the lateral lobes bifid or trifid. ; 
Artemisia * pumila; herbaceous, very ‘dwarf; leaves linear, sublanceolate, 
nearly smooth or pubescent, tomentose beneath, trifid or incisely subpinnatifid 
with few apiculated segments; axills pseudostipular, the stipules simply subu- 
late, or two or three-cleft; flowers in a simple, leafy spike, sessile, axillary, 
solitary, or in clusters of two or three; capituli roundish-ovate ; inner segments 
of the involucrum oval and scariose; flowers polygamous. 
