162 PROCEEDINGS OF THE AMERICAN ACADEMY 



62. CoREX)CARPUS HETEROCARPus (sp. nov.) : annua; foliis mem- 

 branaceis punctatis bipinnatifidis, segmentis brevibus hinc inde denta- 

 tis ; acheniis exterioribus obovatis ala pinuatisecta cinctis, interioribus 

 longioribus clavatis plerumque exalatis nunc tuberculosis exasperatis, 

 omnibus calvis. — Herba gracilis, pedalis, capitulis corymbosis, involu- 

 ci'o 2 lin. longo, ligulis 2-4, lineas 3 longis. — I am confident that 

 Bentham's Goreocarpus parthenioides, and his Acoma dissecta, along 

 with the present plant, belong to one genus, for which, from its analogy 

 to Coreopsis, the name of Coreocarpus may be preferred. Its nearest 

 relationship is with Leptosyne on one hand, and, still more, with Chry- 

 santhellum and Heterospermum on the other. In the next complete 

 revision of the Bidentoid or Coreopsoid genera with fertile rays, I ex- 

 pect to see all these four and some others reduced to one {Heterosper- 

 mimi), which will be the analogue of Coreopsis, and about equally 

 polymorphous in the achenia, &c. — Although the Coreocarpus (Acoma) 

 dissecta is described as a " suffrutex," with linear entire lobes to the 

 leaves, and the achenium with a narrow entire wing, yet I am not sure 

 that it is really distinct from the present plant. The indurated stems 

 and roots of some annuals of a dry region are not rarely described as 

 fruticose ; and the achenia of Bentham's plant, I suspect, were far from 

 mature. Yet our specimens are those of a tender and slender annual, 

 and even the ovaries show the rudiments of the lobed wing, which at 

 maturity is dissected in the manner of most Coreopsides of the section 

 Coreoloma, only more coarsely. The inner disk-achenia are longer and 

 much narrower than the rest, are more or less roughened or tuberculate, 

 and mostly quite wingless. The disk-corollas show a bearded ring at 

 the summit of the proper tube. This Beutham describes, but the artist 

 Las neglected to delineate, in his G. parthenioides ; on the other hand, 

 the artist delineates the same thing in the Acoma dissecta, while it is 

 not noticed in the description. Of the latter plant, also, the appendages 

 of the style are described as " vix puberula," while the artist makes 

 them hairy? In our plant these appendages are elongated linear-subu- 

 late and minutely hispid. 



63. Heterospermum Xanti (sp. nov.) : tenue, glabrum ; foliorum 

 segmentis paucis angustissime linearibus integerrimis ; pedunculis fili- 

 formibus ; involucri exterioris squamis baud ciliatis interiores vix 

 tequantibus; ligulis 7-8 elongatis ; acheniis radii calvis ala lobata, 

 disci linearibus longiuscule biaristatis. — Only a single specimen was 

 collected, of a slender annual, 6 or 7 inches high, hardly suflScient for 



