OF PLANTS CALLED COMPOS LIVE. 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 cue nearly related species of North America, is what Linnaeus originally intended by his Bidens nivea, as appears by the specimen in his Herbarium ; by his original reference to Vaillant's " Ceratocephalus foliis corclatis s. triangularibus flore albo," 1 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, Decandolle, and the second edition of Mr. Aiton's Hortus Kewensis ; and Lamarck in his Illustrationes Generum has copied JacqmVs figure of it, apparently as the principal example of the genus Calea.
It is certainly now too late to recur to the name of Amelias, under which Browne, as I have already attempted to prove, first proposed this plant as a distinct genus ; Linnaeus 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 published by him in 1792 in the second
1 Act, Paris. 3 720, p. 327.
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