392 DESCRIPTIONS OF NEW SPECIES 
bescent, the teeth linear and acuminate. Stigmas exserted, hirsute and fili- 
form, subacute. Involucrum ovate, five-leaved, sepals lanceolate, embracing 
the achenium. Receptacle naked, alveolate, excepting a verticillated, pent- 
angular, five-toothed cup, interposed between the ray and disk. Achenium 
of the ray obovate, three-sided, rugose and naked, with a minute rostrum ; 
that of the disk turbinate, crowned with a ne a hes of four or five long; sca- 
tuse, ciienaed scales.—An olegatet and delicate annual, of a sips fal and 
most agreeable odour; stem divaricately branching from near the base, 
branches almost capillary ; flowers solitary, terminal, fastigiate, white in 
a both ray and disk ; involucrum viseidly glandular, subtended by three acerose 
braetes. Leaves alternate, linear, hirsute, entire. Allied to Calycadenia, 
but with the discal florets perfect, the palea of the receptacle united, and the 
pappus double. —(The name from osuy, odour, and adyy, a gland; in allusion 
to the ‘fre grance of its glandular exudation.) 
Osmadenia * tenella. 
Has. St. Diego, Upper California. Flowering in May. Root simple, tap-shaped, slender. 
Radical and lower stem leaves crowded, somewhat hirsute and strongly ciliate, two or three inches 
long, less than half a line wide, and revolute on the margin. Branches very divaricate; upper 
stem leaves rather distant and acute, rigid, almost acerose. Stem six inches to a foot high, nearly 
smooth and brown, spreading out usually more than its height, Three or four leaf-like narrow 
bractes usually beneath the involucrum. Sepals lanceolate, shorter than the internal leaf-like invo- 
lucrum. Rays about the length of the involucrum, flat, cleft into three lanceolate segments down 
_ to the base, the tube very slender, about the length of ihe border, nearly smooth. Stigmas of the 
2 ‘ ray very long, filiform, equal and smooth. Stamens yellow. Achenium of the ray without pappus, 
black, smooth, and shining, rugose, obovate, short, and three-sided, with a minute, projecting 
epigynous disk, and a prominent narrow cicatrice at the base. Discal florets six to eight, the 
achenium cylindric, turbinate, thinly villous, crowned with a pappus of four or five acuminated, 
thick, scabrous, rigid awns, twice its length, between which are interposed alternately, and in- 
ternally as many, or a fewer number, of obtuse fimbriated scales, less than a fourth their length; 
the florets longer than the pappus, narrow tubular, with remarkably long, linear, acuminated, 
it teeth; the stigmas exserted, long filiform, hirsute, rather acute. 
