v 
of the Class Composite. 281 
libera, complanata, glabra ; articulo superiore longo,:sub- 
stantià crassiore. Anthere in tubum coalite, appendiculá 
ligulatà obtusa callosà rigidà coronate, basi bidentate : 
dentibus brevissimis, setaceis. Stigma bilobum: lobis ob- 
tusis, minute papillosis. .Achenia undique sericeo-villosissi- 
ma. Pappus difformis ; hermaphroditis plumosus, mollissi- 
mus; flosculo disci setosus, radiis subulato-setaceis, recur- 
vatis, rigidis, basi connatis. 
The character of Bacasia appears to have been constructed 
entirely from B. corymbosa, whose only point of distinction would 
consist in the reduced number of male florets, these being soli- 
tary in each capitulum, while in Barnadesia there are several ; 
but this must be admitted to be a character too unimportant to 
be regarded as sufficient to constitute a generic distinction. 
Ruiz and Pavon in their Systema Vegetabilium Flore Peruviane 
et Chilensis added a second species to Bacasia, namely B. spinosa, 
but without altering the generic character previously given in 
their Genera Plantarum. It is evident they had not examined 
this plant with due attention, otherwise it would have been im- 
possible for them to have determined in referring to Bacasia a 
plant which accords in so few particulars with their generic de- 
scription, and which proves to be really a species of Chuquiraga. 
The Diacantha of Lagasca is apparently identical with Barna- 
desia spinosa, but by no means with the Bacasia spinosa of Ruiz 
and Pavon, which he has inadvertently regarded as the same 
plant. The central florets of Barnadesia have eel | hitherto 
described as sterile, but as the anthers ev y contain grains 
of perfect — I have considered them a5 male. 
202 | CHUQUIRAGA. 
