362 DESCRIPTIONS OF NEW SPECIES 
two wide, acute, concave, foliaceous teeth, retrorsely ciliated on the margin. 
Palew 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 filifohum. Coreopsis fihfoha; Hooker. 
Has. In Arkansa plains, near the outlet of the Kiamesha, Red River. 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 seattered 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. Palee 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. IL, p. 215. 
Has. Rocky Mountains, (Jamzs.) 
LEPTOSYNE. (Decanp.) 
Coreopsis, but with the rays styliferous. Receptacle conic, paleaceous; palex 
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 
