44 UNITED STATES AND MEXICAN BOUNDARY. 



tera, Texas, and on the MimLres, New Mexico 

 feet "higlij but it sometimes occurs twenty feet. 



Bigelow. It is usually a shrub of from 3 to 6 



Ptelea angustifolia, Bentli, PI. Hartw. p. 9; Gray. PL Fendl. p. 28. L 

 around Ringgold Barracks ; SchotL Mountain ravines, El Paso ; Thurher. 



COCHLOSPERME^. 



Amoeeuxia Scheidiana, Planch, in Hook. Land. Jour. Bot. 6, p. 140, t. 1; Gray, PI. Wriglit 

 2, p. 26, t. 12, A. Santa Cruz valley, Sonora; Thurher. 



Amoeeuxia Wrightii, Gray, I. c. A. Scheidiana, PI. Wright. 1, p, 29, t. 3. B. excl. syn 

 In rich soil. Eagle Pass, June ; Schott. Hills and plains near the mouth of the Pecos, Octo 



ber (fruit) ; Bigelow. 



AKACARDIAGE^ 



Rhus 



WriqM. 1, ». 31. Limestone rocks 



on Devil's river, and at the mouth of the Pecos ; Bigeloiv. 



Enus MiCROPiiYLLA, Engtlm. in Gray, PI. Wright. 1, p. 31. Ravines along the Rio Grande, 



r 



from El Paso down to Eagle Pass ; also in Chiliualiua and Sonora. 



Ehus trilobatA; Niitt. in Torr. & Gray^ FL Ijp. 219; Graijj PL Wright, l^p. 31. Northern 

 New Mexico and tlie Valley of the Rio Grande ; also in Sonora and California. A form with 

 the leaves velvety-pubescent occurs at the Copper Mines and on the Organ mountainSj New 

 Mexico. 



Ehus copallina, var. lanceolata, Gray^ PL Lindh. 2, p. 158, Hills and rocky places between 

 the Limpia and the Rio Grande, July ; Bigelow. 



Rhus Toxic odexdeon, Linn. ; Torr. & Gray, I. c. A variety with narrow leaves was found 

 on the Sierra del Pajarito, Sonora, by Schott ; and at the canon of Guadaloupe, by Capt. E. K, 



Smith. 



<& Gray, I. c. R, lobata, HooJc. FL Bar.- Amer. 1, p. 127, t. 46: 



(n. ser.) 



Californ 



H. B. K. Nov. Gen. d Sp. 1 



Rocky ravines near the mouth 



of the Pecos, western Texas, October (fruit); Bigeloto. A small tree. 



LiTHEiEA LAURiNA, Walp. Bepcrt. I, p. 550; Torr. PL Whippl. I. c. p. 73. Rhus (Malosraa) 



(fi Gray. Fl 



ExpL 1 



I, p. 219. (Tab. VII.) San Diego, California; Parry. 

 Torr. d Gray, FL L c. d Sylv. 3, j9. 4, t. 82 ; Torr. in Pacif. 

 Santa Barbara and San Diego, California ; Parry, Thurher. 

 Litline, especially upon the young shoots. S. serrata (Nutt.) is 



not distinct. 



ScHiNUS MOLLE, Zmw. Sp. p. 1467. Lower California, near the boundary line ; Parry; and 

 at the Mission of San Luis Rey ; Thurher. It is common also in all the Mexican States, but is 

 probably not indigenous. Mr. Thurber informs me that in California it is called Pepper Tree 

 by the residents, the berries having precisely the taste of the common black Denner 



SIMARUBACi^^. 



Castela Nicholsoni, HooTc. Bot. Misc. \,p. 271, t 56; Gray, Gen. III. 2, t. 158. Dry plains 

 and hills, western Texas, along the Rio Grande, February — March ; Parry, Thurher. Mier 

 Neuvo Leon ; Thurher. 



•^ 



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