natural Family of Plants called Composite. 107 
of its pappus being plumose through their whole length, as in 
Craspedia, from which it is distinguished by the want of paleae on 
the partial receptacles, and very remarkably in habit. 
I have selected the foregoing genera as having been either pub¬ 
lished under different names, or, as it appears to me, unnecessarily 
subdivided. In this extensive class it would not be difficult to 
point out a much greater number consisting of species impro¬ 
perly united. One very remarkable case of this kind is the genus 
Calea, 
to which, as I intend to enter fully into the history and affinities 
of its species, I shall confine myself. 
This genus was established by Linneus in the sixth edition of 
his Genera Plantarum, where the natural character is given: but 
the following essential character, which is still retained, appears 
for the first time in the twelfth edition of Systema Naturae, in the 
third section of Polygamia aequalis : 
“ R eceptaculum paleaceum, Pappus pilosus, Calyx imbricatus.” 
The species originally referred to Calea , in the second edition 
of Species Plantarum, are C.jamaicensis , oppositifolia, and Amellus , 
described from specimens in Browne’s Jamaica Herbarium, which 
he had received a few years before, and incorporated with his 
own. 
These three plants Linneus had originally referred to Santolina*, 
for which it seems to me rather less difficult to account than for 
his afterwards uniting them together to form his genus Calea; 
two of them, according to his descriptions-^, though in reality one 
only, being without pappus, and in other respects corresponding 
with the generic character of Santolina ; and the third, which 
* In Amoenit. Acad. vol. v. p. 404. 
p 2 
f Loe . eit . 
Browne 
