longer teeth of the achenes, though as these are described 
as sometimes absent in C. aristosa, that character will not 
avail much. 
C. aristosa is said to be a swamp plant in America, but it 
has flourished in the herbaceous ground at Kew, where the 
soil is anything but moist, attaining a height of three feet ; 
it is described as a biennial, but it is annual here, and 
flowers in September and October. 
Desor. A tall slender annual or biennial, with erect wiry 
red-brown stems, two to three feet high, quite glabrous, 
except for a few hairs chiefly towards the bases of the 
leaves and nodes. Leaves opposite, once or twice pinnati- 
“sect; the segments five to seven, rather distant, one to 
three inches long, lanceolate, acuminate, deeply serrate, 
entire towards the narrowed bases. Heads golden-yellow, 
nearly two inches in-diameter, in panicled corymbs; pedun- 
cles very slender, wiry, tortuous, with a few small distant 
simple leaves. Involwcre of many bracts ; outer numerous, 
leafy, spreading and twisted, linear, obtuse; inner erect 
with involute margins above the middle. Ray-flowers about 
eight, neuter, with a short tube and large elliptic lanceolate 
acute flat five-nerved limb. Di¢sk-flowers small, tubular. 
Style-arms acute. Achenes flattened, broadly oblong, hispid, 
the margins thickened and produced upwards each into an 
erect hispid awm as long as the achene (awns sometimes 
four or wanting, according to descriptions).—J. D. H. 
Fig. 1, inner involucral bract; 2, scales of receptacle ; 3, ray-flower ; 4, disk- 
flower; 5, style-arms ; 6, achene :—al/ enlarged. 
