1865.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 495 



More commou and characteristic are the following : 

 On slopes : 



Prosopis j uUfiora. 



Zizyphus ohtusifolius. 



Cercocarpus parvifolius. 



Bhus virens, microphylla, trilobata, 



Forestiera angustlfolia. 



Lippia WrightU. 



Boiivardia hirtella. 



Houstonia fasciculata. 



Dalea form osa. 



Calliandra conferta. 



Acacia EoBmeriana, Greggii, eonstricta, filicina. 



Porliera angustifoUa. 



Bernardia myricoifolia. 



Salvia chamcedryoides and Begla (new to the United States). 



Philadelphus nncrophyllus. 



Berheris Fremontii. 

 In valleys : 



Garry a ovata. 



Bhamnus Purshiana. » 



Kceberlinia spinosa. 



Prunus minutijiora. 



Morus microphylla. 



Diospyros Texana. 



Condalia Mexicana and spathulata. 



Mimosa hiuncifera. 



Vngnadia speciosa. 



ISapindus marginatiis. 



Abundant are Lechuguilla, Maguey, and Sotol, The former {Agave 

 heteracantha) infests the foot-hills, and, in places, extends up high 

 slopes where it mingles with the latter {Basylirion Texanum). The 

 Maguey {Agave Wislizeni), already noticed in other mountains, thrives 

 in high altitudes, even on the very summit. Its stem is from 3 to 5 

 inches in thickness, 13 to 18 feet high, and bears from eight to sixteen 

 panicles. 



To these i)lants should be added the usual Yncca baccata and angusti- 

 foUa, Nolina erumpens and Texana, and the bushy Composites: Rymena- 

 tkerum acerosum, Zexmenia brevifolia, Trixis angustifoUa. 



Of the Cactacse the most prominent representative is the noted Straw- 

 berry Cactus {Cereus stramineiis), with large, luscious fruit. 



Of the many lignescent or herbaceous plants which characterize these 

 mountains, the following are most conspicuous : 



Garlowrightia UnearifoUa, common in arroyos. 

 Pentstemon barbntus, Fatoni, Havardi. 



