402 . DESCRIPTIONS OF NEW SPECIES 
fringed at the apex. Receptaculum eetllose, naked. Involucrum round- 
ish-ovate, imbricate; sepals from five to ten ina single or double series, ob- 
tuse, and broadly scariose on the margin. Achenium turbinate and smooth, 
three to five-angled, with a vesicular testa, terminated with a small, paleace- 
e, 
ous, unequal cup of three to five, or more, acute scales.—Low alpine, ceespi- 
“tose or suffruticose perennials, canescently tomentose, with simple scapoid 
stems, terminating in a single spherical, or somewhat round lobed cluster of 
capituli. Leaves alternate, cuneate, pseudopetiolate, once or twice trifid, 
with the segments linear and entire; florets yellow. Allied to Artemisia, 
and with the same aroma, but with a different habit.—(The name in allu- 
‘sion to its capitate inflorescence.) ie cd 
Spheromeria * capitata; dwarf and cxspitose, canescently sericeous; leaves 
once or twice trifid towards the summit, sheathing at the base, segments linear- 
oblong; leaves of the scapoid stem simple; se conglomerated into a sphe- 
rical head ; involucrum about five-leaved. © 
Has. Ona i hill, near the Red Butes of ht Platte, towards its northern sources on the 
Sweet Water. — ~ Flowering i in June. Growing on the summit of a rocky hill, in round tufts of 
densely matted herbage, soft, silky and hoary with pubescence; scapes or scapoid stems slender, 
three or four inches high, the spherical cluster about the size of a small cherry. Scales of the in- 
voluerum oval, concave, hairy on the margin. Radial florets short and truncated, two or three- 
toothed, becoming enlarged and indurated at base. Discal florets about eight or ten, mostly 
infertile, with rudimental achenia. Style of the ray bifid, obtuse, cleft half way down, minutely 
pencillate at tip. Achenium somewhat three-sided, the angles terminating in a minute crown of 
acute pappus. The seed (at least in a young state,) enveloped in a utricular loose testa. The 
odour of the plant agreeable, almost like that of chamomile. 
L \Sphceromeria’ *argentea; suffruticose and somewhat cespitose, whitely and 
_ closely tomentose; leaves cuneate, entire, or three-cleft at the summit, the up- 
permost also minute and undivided ; stem simple, terminating in a single, rather 
round cluster of capituli; involucrum biserial, ten-leaved. 
Has. In i Rocky Mountains, near the sources of the Pisiié, and Colorado of the West. 
Flowering in July.—A very elegant and diminutive shrub, with the taste and odour of wormwood, 
_ but more E screeably aromatic; the flowers bright yellow. Leaves about half an inch long, one to 
two l s wide. Stem about four inches high, very slender, like a leafy peduncle, terminating in 
a rout or hemispherical cluster of three to five capituli. Outer scales of the involucrum ovate. 
Radial florets about five. Achenia about five-angled, with an unequal pappus of five or more 
parts, longest on the angles; testa loose and utricular. Receptacle papillose. Discal florets nume- 
rous. Stigma truncate, and minutely pencillate. 
