362 DESCRIPTIONS OF NEW SPECIES 



two wide, acute, concave, foliaceous teeth, retrorsely ciliated on the margin. 

 Palese of the receptacle oblong, membranaceous, embracing the fruit. — Pe- 

 rennial, smooth herbs, with capillary, or linear, opposite, pseudopinnated 

 leaves, and few-flowered, dichotomal branched stems; flowers few, long pe- 

 dunculate, yellow, with a brown disk ; the ray in the second species said to 

 be wanting. 



Cosmidium filifolium. Coreopsis filifolia; Hooker. 



Hab. In Arkansa plains, near the outlet of the Kiamesha, Red Eiver. Flowering in May. Pe- 

 rennial and very smooth, about two feet high, with a rather slender, terete stem. Leaves oppo- 

 site and fasciculate, petioles connate at base, pseudo-bipinnate, with long, linear, capillary, grooved 

 segments ; secondary divisions and uppermost leaves trifid, ultimate pairs simple ; branches tricho- 

 tomal, uppermost dichotomal; the flowers few, upon very long peduncles. Outer and inner calyx 

 each eight-leaved; exterior segments linear-lanceolate, acuminate, a little shorter than the inner, 

 which are lanceolate-oblong. Rays about eight, almost equally three-lobed, sulphur yellow, neu- 

 ter. Discal florets dark brown, with a slender tube, the upper part campanulate, and cleft nearly 

 to its base, in five linear, reflected segments, the tube of anthers brownish-black, and exserted, 

 with distinct ovate cusps. Stigmas hirsute with golden hair, each terminating in a slender conic 

 point. Achenium subcylindric, pale brown, somewhat curved, tubercular or rough, somewhat 

 carinated internally, indurated into a nut, with a thickish shell, almost as in Sclerocarpus, with 

 here and there a few scattered hairs, terminated above in two sublanceolate, concave, large teeth, 

 edged with golden yellow, reflected hairs; the proper seed with its integuments within the indu- 

 rated envelope. Paleae wide, oblong and membranaceous, obtuse, with a dark rib in the centre, 

 and embracing the back of the achenium, but not extending over the front. 



Cosmidium gracile; glaucous; leaves pinnately dissected in five divisions, 

 segments narrow linear, entire; capituli discoid? bractes scarcely one-third the 

 length of the involucrum. Bidens gracilis; Torrey, in Ann. Lyceum, New 

 York, Vol. II., p. 215. 



Hab. Rocky Mountains. (James.) 



LEPTOSYNE. (Decand.) 



Coreopsis, but with the rays styliferous. Receptacle conic, paleaceous; palese 

 oblong, obtuse, flat, three-nerved. Achenium obovate, compressed, some- 

 what curved, scabrous, with at length a broad, fungous margin and centre,, 

 the centre terminated by a minute, entire cup; the radial fruit imperfect, and 



