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138 



Larrea Mexicana, Moricand,pl. nov. t. 48 "Creosote plant.' Io- 

 deodondo of the New Mexicans. Used externally for rheumatism. 

 A shrub from three to six feet high. Abundant from the upper 

 waters of the Arkansas and valley of the Del Norte, to the great 

 sandy deserts of California. It likewise occurs in the northern 

 parts of Mexico. The plant abounds in a strong smelling resinous 

 matter. No animal seems to feed on it, and it is useless for fuel, 

 as it can scarcely be made to burn. 



ANACARDIACE.E. 



Rhus glabra, Linn. From the upper part of the Arkansas to 

 longitude 107°. 



R. laurina, Nutt. A large shrub. Mountains of California, 

 towards the sea coast. 



R. trilobatAj JVutt. On the Gila. A shrub 18 inches high, found 

 late in the autumn, with staminate aments nearly matured for the 

 following spring. The whole plant is clothed with a dense velvety 

 pubescence. It is, perhaps, a distinct species from R. trilobata. J 



MALVACEAE. 



Malva Munroana, Dougl. High sandy plains, and in the valley 

 of the Gila. Flowers bright rose color. 



M. pedata, Torr. and Gr. Upper part of the Arkansas. 



Sphjeralcea stellata, Torr. and Gr. Near Santa F6, &c, High- 

 lands between the Del Norte and the Gila. 



Sida coccinea, DC. On the Raton mountain. Several other un- 

 determined Malvaceae occurs in the collection. 



SAPINDACEiE. 



Sapindus marginatus, Willd (soap berry.) Valley of the Gila. 



RHAMNACE.E. 



Ceanothus ovalis, Bigel., Torr. and Gr. On the Arkansas. A 

 small scrubby species of this genus was found on the Cordilleras 

 of California, towards San Diego. It has thorny branches, small 

 ovate tioriaceous, smooth entire leaves, which are supported on 

 short petioles. The branches are glabrous and glaucous. There 

 were neither flowers nor fruit on the specimen. 



C. ovalis, var. intermidius, Torr. and Gr. On the Arkansas. 



LEGUMINOS^. 



Sesbaniamacrocarpa, Muhl. On the Gila. In fruit November 

 20. 



Glycyrrhiza lepidota, JVutt. Near Santa Fe. Not found in 

 flower. 



Psoralea esculenta, Pursh. (Pomme de Prairie.) On the Ar- 

 kansas. § 



P. floribunda, JVutt. With the preceding. 



Amorpha fruticosa Linn. On the Gila. The specimens were 

 without flower and fruit, and we therefore cannot be certain of the 

 species. 



