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thers yellow. Branches of the style tapering into a subulate-lanceolate point, hairy above the middle. Achenia obcompressed, scarcely winged, scabrous; the outer integument thin; those of the ray naked, of the disk with a single awn.
, Gaillardia amblyodon, Gay. On the upper part of the Arkansas. This species has been beautifully figured by Dr. Gray in Mem. Jlmer. acad. (n, ser.) t. 4.
G. pulchella, Foug.    Valley of the Del Norte.
Palafoxia linearis, Lag.    New Mexicd.
Hymenoxys odorata, DC.    Great desert west of the   Colorado.
Artemisia filifolia, Torr. in Jinn. lye. N. York,2]). 211. Valley of the Del Norte, and along the Giia; abundant.
A. dracunculoides, Pursh. Table lands of the Del Norte and Gila. A very common species of underwood, often called sage by the hunters.
A. cana, Pursh.    On the Raton mountains.
Senecio longilobus. Benth. in pi. Hartweg. A bushy species about three feet high, growing abundantly in the region between the waters of the Del Norte and the Gila.
Tetradymia, (sub-genus Polydymia.) Heads about 16-flowered; the flowers all tubular and perfect. Involucre of 15 to 16 oblong obtuse coriaceo-chartaceous scales which are slightly concave but not carinate. Receptacle naked. Corolla with rather slender tube; the lobes short, ovate, erect, furnished with long villous hairs externally. Anthers included. Branches of the style tipped with a very short obtuse pubescent cone. Achenia oblong-turbinate, villous with short hairs. Pappus of numerous, somewhat rigid, denticulate bristles. A suffrutescent prostrate much branched plant, canescently and densely tomentose; the leaves broadly obovate, toothed, narrowed into a petiole. Heads on short peduncles, terminating the somewhat corymbose branches.
T. (Polydymia) ramosissima, n. sp. Hills bordering the Gila. Stem spreading, with very numerous matted branches. Leaves about three-fourths of an inch in length, the lamina broader than long, wkh 5 7 indistinct rounded teeth, abruptly narrowed into a longish petiole. Heads about one-third of an inch in diameter, ovate. Involucral scales in several series, the exterior ones shorter than the interior. Hairs of the achenium smooth, slightly bifid at the summit. Pappus longer than the achenium. This plant is clearly allied to Tetradymia, but differs in the many-flowered heads, numerous scales of the involucre, slightly cleft corolla-tube, and in several other characters; so that it should perhaps form the type of a distinct genus.
Cirsium undulatum, Spreng. The locality of this plant is not recorded, but it was probably found on the upper part of the Arkansas.
Stephanombria paniculata, Mutt. Ascending the Cordilleras of California.
Mulgedium pulchellum, Nutt.   Pawnee Fork of the Arkansas.
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