290 OBSERVATIONS ON THE NATURAL FAMILY 



alternd) indivisa. Capitula ovata, terminalia, terna {vel 

 solitaria). Palese lanceolatcB. Corollse albidcs. Antherse 

 basi truncates. 



Obs. I have so constructed the generic character of 

 Isocarpha as to include Spilanthus atriplicifolius of 

 Linnaeus, which, however, differs very remarkably from 

 Calea oppositifolia in having alternate leaves and soli- 

 tary capitula, as well as in the texture and form of its 

 palese. 



The pappus, consisting of three or four very minute 

 aristae, described by Swartz^ in Calea oppositifolia, I have 

 not been able to observe in any of the specimens that I have 

 examined. 



The tJiird species, Calea Amellus, is probably the same 

 plant as Bidens scandejis, which Linnseus described in 

 Hortus Cliffortianus, but, having no specimen in his own 

 collection, appears to have forgotten. The original speci- 

 men in Clifford's Herbarium, now in the possession of Sir 

 Joseph Banks, evidently belongs to the same -species, and 

 perhaps to the same individual, with a specimen in Miller's 

 collection, which Mr. Dryander compared, and considered 

 to agree with Calea Amelhs of the Linnean Herbarium. 

 The true synonym, therefore, of Calea Amellus is " Bidens 

 ui] sufFruticosus yimineus, fohis oblongo-ovatis oppositis, flo- 

 ribus comosis" of Browne f while Linnseus has quoted and 

 even derived his specific name from the same author's 

 " Amellus ramosus, foliis remotis terminalibus, fulcris longis 

 divaricatis "^ which, instead of belonging to Bidens 

 scandens, I believe, for the following reasons, to be Bidens 

 nivea. 1st, The figure in Burmann's Thesaurus Zeylani- 

 cus,* quoted by Browne for his plant, though belonging to 

 Lavenia erecta, is at the same time a good representation 

 of Bidens nivea, and very unlike Bidens scandens. 2dly, 

 Browne's description in most respects very well agrees with 



1 In Obs. Bot. p. 302. ^ Browne, Jam. 317. ^ I. c. 



' Eupatoriophalacrum sorophularia; aquaticae foliis oppositis, Burm. Thesaur. 

 Zeyl. p. 95, t. 42. 



