60 UNITED STATES AND MEXICAN BOUNDARY. 



ramulis (saepe ?) in spinas abuentibus ; foleis geminis vel teenis pinnatis, petiolo cammuni 

 exalato supra canaliculate^ foliolis 4 — 7-jugis minimis (1 lin. long,) suborbiculatis late ovali- 



busve obtusis aubcoriaceis ; staminibus petalis longioribus. On the Colorado, near Fort Yuma; 

 ScJiotf. This is an interesting addition to our Flora^ being an undoubted native Parkinsonia, 

 entirely distinct from P. aculeata, and much more nearly related to P. Africana, Soud, (in Lin- 

 ncea.^ 23, p. 38.) We have seen no specimens showing the inflorescence but only a few loose 

 flowers from the collections of Mr. Schott, From the fructiferous specimens it would appear 

 that the racemes are fewer-flowered and the pedicels shorter than in P. aculeata. The flowers, 

 too, are smaller, the stamens much more exserted^ and the petals (except the vexillum) are 

 •ovate, not roundish, as in that species. The pods are nearly the same in both. These vary 

 from 2 to several-seeded, and are constricted between the seeds with a very long acumination. 



C^SALPiNiA PULCiTERRiMA, Swavtz ; ToTT. & Gvciy^ Fl. 1, p. 397. Ures, Sonora, October; 

 Thurher. 



■ 



Algakobia glandulosa, Torr. & Gray^ I. c. p. 399 ; Gray^ PL Wright. 1, p. 60. Sandy soils 

 along the Rio Grande and its tributaries and in the Mexican States. Common on the bottom 

 lands of the Gila. This is the celebrated mesquite, so often noticed in the reports of western 



exidoration. Dr. Gray (1. c.) 



(together with P. dulcis and P. 



Siliquastrum) to P. juliflora. It affbrds a gum nearly ec[ual to gum arable, of which it stated 

 that large quantities have lately been sent to San Francisco from Mexico. 



Strombocarpa PUBESCENS, Gvay^ PI. Wright, p. 60; Torr. Pacif. R. Road Expl. 6, p. 360, t. 4. 



Yalley of the Rio Grande from New Mexico, 20 miles below San Elceario ; Bigeloia. Bottom 

 lands of the Rio Gila and R. Colorado, The Screiv-hean or 

 lers and Tornillo of the Sonorians. 



* 



Strombocarpa cinerascens. G'rav, I. c. ». 61. adnot. Eo^r 



Si 



Mel 



places on tlie Lower Rio Grande, May, November ; Schott. The thorns are variable in length, 

 being sometimes longer, sometimes much shorter than the leaves. Pods like those of 

 cenSy except that they are a little thicker. 



S 



Hooh 



Caves, and near Eagle Pass, 



* 



tate in the Florida plant. 



Schott. In our specimens the fruit is sessile, while it is stipi- 



Sch 



H 



the Copper Mines, August ; Bigclow. Common near Eagle Pass ; Schott 



& Gray, FL. l,_p. 402 ; Gray, PI. Wright. 2, p. 63. Gravelly hills 



Copper 



Bigelow, Parry. 



) August, ( 



d: PI. Wriqht. 1, ». 61. Hea 



Oak 



Pedro; Bigelow. Eagle Pass, April— June ; Schott. 



Mimosa Bohealis, Gray, PI. Fendl. p. 39, (k PI. Wright 

 September, (in fruit) ; Bigelow. 



Mimosa Lindheimeri, Gray, PL Lindh. 2, p. 



July ; Bigelow. 



Mimosa dysocarpa, Benth. in Gray, PI. Wright, 1, p 62. On the Cibolo'of the Rio Grande 

 and Rock Creek; also hills at the Copper Mines, July— Augu.^t ; Bigelow. 



Mimosa malacophylla. Gray, PI. Lindh. 2, p. 182, adnot, d PI. Wright. 1, ». 163. Rocky 



181. Rocky and gravelly hills and ravines, 



