[7] 



152 



EUPHORBIACE.E. 



Eremocarpus setigerus, Benth. in Bot. of Sulpk., p. 53, t. 26. 

 Plains of San Diego, California. 



Hendecandra Texensis, Klotzsch. H. multijlora, Torr. inFrem. 

 1st report. Croton muricatum, Nutt. Valley of the Del Norte. 



Another species of this genus, allied to H. procumbens, was 

 found on the Cordilleras of Mexico, but the materials are scarcely 

 sufficient for determining it satisfactorily. 



Stillingia spinulosa, n. sp. SufTruticose? leaves rhombic-ovate, 

 rigid, narrowed at the base, prominently 3-nerved, mucronately 

 acuminate, dentate spinulose on the margin; spikes axillary and 

 terminal; sterile flowers sessile; bracts acuminate, with a stipitate 

 gland on each side at the base. Abundant in the desert west of 

 the Colorado. Stem (apparently) about a span high, with spread- 

 ing branches. Leaves an inch or more in length, sessile, neatly 

 margined with spreading spinulous teeth, glabrous on both sides. 

 Spikes numerous; with solitary fertile flowers at the base. Sterile 

 flowers about as long as the scale. Perianth hemispherical, irreg- 

 ularly lobed and undulated. Stamens 2. Fertile flowers imperfect 

 in our specimens. Fruit glabrous > 



Euphorbia herniaroides, Nutt. Banks of the Gila. A pubes- 

 cent variety of this species was found in the desert west of the 

 Colorado. 



CUPULIFER^. 



Quercus Emoryi, n. sp. Leaves coriaceous, oblong, on very 

 short petioles, remotely and repandly toothed, the serratures mu- 

 cronate, smooth on both sides; fruit pedunculate, solitary and in 

 pairs, gland ovoid-oblong, mucronate; cup hemispherical, the scales 

 appressed. Common in the elevated country between the Del 

 Norte and the Gila. This small-leaved oak resembles Q. agrifolia 

 and Q. undulata, (Torr. in Ann. lye. N. York 2, p. 248, t. 4,) but 

 is quite distinct from both. 



SALICACE^E. 



Salix. Several narrow-leaved willows were found along the 

 Gila, and in the region west of the Colorado; but being without 

 fructification they cannot be determined. One of them is used as 

 food for cattle when there is no grass. 



PLATANACEiE. 



Platanus Mrxicanus, Moricandpl. nouv. ou rares d?Jlmer. t. 26. 

 P. Calif ornicus,- Benth. bot. Sulph., p. 54. P. racemosus, Nutt.? 

 Valley of the Gila. 



CONIFERS. 



Ephedra occidentalis, Willd.l From the region between the Del 

 iNorte and the Gila, and the hills bordering the latter river to the 



