256 Mr. D. Don’s Descriptions of new Genera and Species 
culum spinulosum, hujus stirpis optimum characterem con- 
stituens, designare volui. 
The Onoseris salicifolia of M. Kunth may pinssitiby belong to 
this genus; but not having had an opportunity of examining a 
sample of it, I am unable to determine this’point at present. It 
cannot belong to Onoseris, which has the habit of the Perdicee, 
and with which tribe the genus must be associated. 
1. C. albicans. 
Hieracium albicans. Herb. R. et P. 
ar Peruvia. Ruiz et Pavon.r. 
CH ETACHLENA. 
Receptaculum favosum. — Flosculi disci hermaphroditi, tubulosi, 
5-dentati ; radii foeminei, ligulati. | 
Involucrum semiglobosum, polyphyllum : squamis numerosis- 
simis, quadruplici circiter serie imbricatis, lanceolatis, in 
setam longam, recurvato-patentem prodeuntibus. Recep- 
taculum favosum, dentato-scabrum. Flosculi radii plures, 
foeminei, ligulati, unilabiati, trilobati, 6-nervii (nervis per 
paria discum laciniarum occupantibus) feminei? staminum 
rudimentis; disci hermaphroditi, tubulosi, 5-dentati, tubo 
. infra medium angustiore, fauce cylindrica, latere exteriore 
» profundiüs fissi: nervis 5- primariis ad laciniarum sinus di- 
visis: dentibus linearibus, obtusis. Anthere appendiculâ 
lineari-lanceolatá, acutiuscula, coriaceá c coronatz, basi setis 
2, longis, tenuissimis, simplicibus munite. Stigma herma- 
phroditis inclusum, emarginatum, obtusum; foemineis ex- 
sertum, magnum, indivisum, clavatum, pruinosum. Achenia 
 euneato-oblonga, pilosiuscula. Pappi radiis persistentibus, 
triplici ordine digestis, copiosis ; interioribus compressis, ri- 
gidis, serrulatis; extimis brevissimis, pilosis. 
Herba 
