AND GENERA OF PLANTS. 313 



Division III. — CHRYsocoMEiE. 



Receptacle naked. Capitulum wholly yellow, with or without rays, rays neu- 

 ter or feminine. Pappus paleaceous or pilose, rarely wanting; similar or 

 dissimilar in the ray and disk. In the section Chrysopsidece double, the ex- 

 terior short and chaffy. 



BRACHYRIS. 



Brachyris Eutliamice. 



Hab. In the Rocky Mountains, towards the upper branches of the Platte. Suffruticose. 



Brachyris * divaricata; suffruticose, glutinous, corymbosely and divaricately 

 branched; leaves narrow linear, acute; flowers nearly all pedunculate; involu- 

 crum turbinate, the scales ovate, rays about six, discal florets about seven or 

 eight, pappus of the ray somewhat shorter, the rest elongated. 



Hab. With the above, in the Rocky Mountains, to which it is nearly allied, but with larger and 

 seldom sessile flowers. Very resinous and heavy-scented. 



*AMPHIACHYIIIS. 



(Decand. Vol, v., p. 313, as a section of Brachyris.) 



Character nearly that of Brachyris, but with the involucrum obovate and 

 bracteolate, scales few and obtuse, not herbaceous at the points. Recepta- 

 cle deeply alveolate. Rays feminine, eight to ten, oval. Discal herma- 

 phrodite florets twenty -five to thirty, small. Pappus of the discal florets 

 united at base, dividing into about six entire setse. Radial florets, with a 

 very minute crown of scarcely visible setse. — A very distinct genus, allied to 

 Hemiachyris, but wholly different in the pappus, which scarcely differs from 

 that of Grindelia, but it is united at base, and quite persistent. 



Amphiachyris dracunculoides. (Decand., under Brachyris, Vol. V., p. 313.) 

 I collected this plant in 1818, on the margins of ponds, near Salt River of Ar- 

 kansas. Flowering in September. 



VII. — 4 D 



