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thers yellow. Branches of the style tapering into a subulate-lan- 

 ceolate 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 Mexico. 



Hymenoxys ouorata, DC. Great desert west of the Colorado. 



Artemisia filifolia, Torr. in Ann. lye. N. York, 2 p. 211. Val- 

 ley of the Del Norte, and along the Giia; abundant. 



A. dracunculoiJdes, 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. Ilartweg. 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 ex- 

 ternally. Anthers included. Branches of the style tipped with a 

 very short obtuse pubescent cone. Achenia oblong-turbinate, vil- 

 lous with short hairs. Pappus of numerous, somewhat rigid, den- 

 ticulate bristles. A suffruttscent prostrate much branched plant, 

 canescently and densely tomentose; the leaves broadly obovate, 

 toothed, narrowed into a petiole. Heads on short peduncles, ter- 

 minating the somewhat corymbose branches. 



T. (Polydvmia) ramosissima, 7i. 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, with 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 diifers .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. 



Ciksum undulatum, Spreng. The locality of this plant is not 

 recorded, but it was probably found on the upper part of the 

 Arkansas. 



Stephanomeria paniculata, Nutt. Ascending the Cordilleras of 

 California. 



Mulgedium pulchellum, Nutt. Pawnee Fork of the Arkansas. 



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