114 
Mr. Brown’s Observations on the 
in its fructification or habit, any of the three genera of which, as 
has been shown, Calea was originally composed. This fourth 
species, which he had at first referred to Chrysocoma *, is now 
known to be dioecious;—Browne, by whom it was first described 
and figured, and one of whose specimens I have examined, Lin- 
neus, and even Swartz when he published his Observationes Bo- 
tanicse, being acquainted with the male plant only ; which, how¬ 
ever, all of them considered hermaphrodite: nor is there any 
reason to doubt that Gaertner’s genus Sergilus is also the male of 
this species; although he has ventured to describe the colour of 
the embryo, deceived, probably, by the size of the imperfect 
ovarium, and the colour of its inner surface. 
Professor Swartz has since given a more satisfactory account 
of Calea scoparia, and has referred it to Baccharis' {'; to which ge¬ 
nus as Richard ij: and Jussieu § have proposed to limit it, namely 
to the dioecious species of America, it unquestionably belongs. 
This limitation of Baccharis it may, upon the whole, be expe¬ 
dient to adopt; by doing so, however, a name of Dioscorides 
is applied to a genus of plants found only in the new continent; 
while, notwithstanding the contrary opinion is expressed by M. de 
Jussieu ||, sufficient distinctions exist between those species of Bac¬ 
charis from which the Linnean character was taken, and Conyza 
w r hen reduced to its original species, C. squarrosa and bifrons, and 
a few others since added to the genus : for these differ from Inula 
chiefly in the extreme shortness of their ligulae. 
As no satisfactory character has hitherto been given of Baccha- 
ris , that will serve to distinguish it, as now limited, from the dioe¬ 
cious Gnaphalia , I propose the following. 
* Atnoen. Acad. v. p. 404. etSyst. Nat. ed. 10. vol.ii.p. 1206. 
f Flor. Ind. Occident, iii. p. 1339. | Mich. Flor. Bor-amer. ii. p. 125. 
§ Annal. du Mus. d’Hist. Natur. vii. p. 385. || 1. c. 
Bac- 
