I 



f 



Ex. Doc. No. 41. 143 



another work This species, from the scales of the involucre bein^ 

 m a single wheel, we propose to call H. monogyra, Torr. and Gr 

 It was found in various parts of the valley of the Gila 

 Franseria Hookeriana. Jfutt. (Yerba del Sapo ) ' 



Mrosia acanthocarpa, Hooker. Very abundant from Santa Fe 

 to the 66d parallel of latitude. 



Another species of this genus, and apparently an undescribed 

 one, exists in the collection. It is suffretescent hoary, with the 

 leaves bipinnatifidly, divided into very small obtuse segments. The 

 flowers are wanting. 



Ambrosia artemisieefolia, Linn. Eanks of the Gila. 



DicoRis, Torr. and Gr. Another new genus, allied to Ira of 

 Which a full description and figure will hereafter be given. It was 

 found in the valley of the Gila, and in the desert of drifting sands 

 west ot the Colorado. (5 to 6 inches long, and 4 to5 wide.) 



\Nyethia ovata, n. sp., Torr. and Gr., {?ied. Stem very stout, 

 eaves orbicular, ovate, entire; somewhat coriaceous, pubescent, 

 ^as are also the petioles and branches,) scales of the involucre lan- 

 ih^^^ P'^PPus of 3 to 4 acute rigid teeth, one of which'is longer than 

 the others. Abundant on the western side of the Cordilleras of 

 California. 



Silphium laciniatum, Lhin. (Pilot weed.) On the Arkansas and 

 Its tributaries. 



Another Silphium, with large ovate undivided leaves, was found 

 on tariso creek. 



Englemannia pinnatifida, Torr. and Gr. Ji. JV. ^m. 2, p. 2S3. 

 Aributaries of the Canadian. ^ 



Puj?h^''^'ll ^°^^°inaris, Torr. and Gr. Rudheckia columnaris. 

 xswll ^ ^^y^ ^"y ^^°^ ^^^"g wholly yellow to entirely pur- 

 pnsh brown From the head waters of the Canadian to Santa Fe. 

 diner /arinosa, Gray, ined. An aromatic shrubby plant; exu- ' 



softu/ r °'^'''^ ^^'^° f^°"^ thebraches. The leaves are ovate, 

 culJ? P^^^^^^nt, and hoaryonbothsides, with 3 to 5 prominent reti- 

 u y serves underneath. 



valley ol-^the t?^*''^^^'"^^' '^''^'- ^PP^' P^^^ °^ ^^e Arkansas, and 



H- lenticularis, DougL With the preceding, 

 ^oreopsis palmata, JVutt. Turkey Creek. 



foiin?^^-^* A ^^yless, and probably new species of this genus, was 

 hrlTrh''' ^?^^e^ of the Agua Caliente, November 28th. It is a 

 ered -"Ik ^ ' ^"^^^^ slender bark of the irregular twigs is cov- 

 scarceT ^ whitish, very scabrous pubescence. The leaves are 

 a'nd J.\.^^ ^"^^ ^°°Sj ovate, entire obtuse, with short petioles, 



the ohT ."^ ^"^ ^°^^ ^'^^^- ^^^ff of the receptacle, embracing 

 *i% ||;j^^^ >chenium, the margin of which is furnished with long 



Wulfia 7 ^^ • /. , 



genus h\ fP^cimens of a plant with the floral characters of this 

 tiehpr T ^j . different foliage, were found in abundance on the ► 

 Leibh,-/""?'^f -^ bordering the valley of the Gila. It also resembles 

 5 ^la, Dut is destitute of a pappus. Some of the genera, t# 



