OF PLANTS CALLED COMPOSITE. 295 



them an equal number, not one of which belongs to any of 

 the genera formed by the original species, but to four 

 others equally distinct. 



The first of these additional species, taking them in the 

 order in which Willdenow has arranged them, is Calea 

 aspera, which he adopted from Jacquin ; by whom it is 

 well described and figured, though erroneously referred to 

 Calea. 



This, and not (as M. Richard has supposed) the [ns 

 nearly related species of North America, is what Linnteus 

 originally intended by his Bidens nivea, as appears by the 

 specimen in his Herbarium ; by his original reference to 

 Vaillant's " Ceratocephalus foliis cordatis s. triangularibus 

 fiore albo,"^ described from a specimen in Surian's Herba- 

 rium ; and by his afterwards adding as varieties of his spe- 

 cies the two plants from Carolina figured in Hortus 

 Elthamensis. 



Calea aspera is abundantly distinct from Bidens, and 

 has very little affinity with any of the original species of 

 Calea, and least of all with C. jamaicensis, from which the 

 character was taken. Since its appearance in Willdenow's 

 work, however, it has been continued in this genus, in 

 most of the recent catalogues of Gardens, as those of Des- 

 fontaines, DecandoUe, and the second edition of Mr. Alton's 

 Hortus Kewensis; and Lamarck in his Illustrationes 

 Generum has copied Jacquin's figure of it, apparently as 

 the principal example of the genus Calea. 



It is certainly now too late to recur to the name of 

 Amelhs, under which Browne, as I have already attempted 

 to prove, first proposed this plant as a distinct genus; 

 Linneeus having soon after given that generic name to two 

 very different plants, to one of which it is still applied ; and 

 the real plant of Browne having till now been mistaken, 

 owing in part to his having entirely overlooked the pappus 

 which is deciduous. 



Bidens nivea, however, as long ago as 1784 was described 

 by Von Rohr, and pubUshed by him in 1792 in the second 



' Act. Paris. 1720, p. 327. 



