VI TABLE -OF CO"N"TENTS. 



List of trees of the Mexican Boundary Line — Continued. Page. 



Populus augustifolia ( Narrowleaf cotton wood ) -47 



Populus f remontii ( Fremont cottonwood ) 48 



Alnus oregona ( Red alder) 49 



Quercus gambelii ( Gambel oak) -ft) 



Quercus breviloba (Durand oak) 50 



Quercus undulata (Rocky Mountain oak ) 50 



Quercus engelraanni (Engelmann oak; evergreen white oak) 50 



Quercus oblongifolia (Oblongleaf oak; bhie oak) 50 



Quercus arizonica ( Arizona white oak ) 51 



Quercus reticulata (Netleaf oak) 51 



Quercus toumey i (Toumey oak ) 51 



Quercus dumosa ( California scrub oak ) 52 



Quercus emory i ( Emory oak ) 52 



Quercus chrysolepis ( Canyon live oak ) 52 



Quercus agrifolia (California live oak ) 53 



Quercus hypoleuca ( Whiteleaf oak ) 53 



Quercus wislizeni ( Highland live oak ) 54 



Quercus texana (Texas red oak) .• 54 



Quercus cahfornica (California black oak) 54 



Ulmus crassifolia (Cedar elm) 54 



Celtis occidentalis ( Hackberry) 54 



Celtis reticulata ( Palo bianco ) 55 



Celtis mississippiensis ( Sugarberry ) 55 



Morus rubra ( Red mulberry ) 55 



Morua celtidifolia (Mexican mulberry) 55 



Umbellularia californica (California laurel) 56 



Lj'onothamnus floribundus asplenifolius (San Clemente ironwood) 56 



Platanus occidentalis ( Sycamore) 56 



Platanus racemosa ( California sj'camore) 56 



Platanus wrightii ( Arizona sycamore) 56 



Vauquelinia californica ( Vauquelinia) 57 



Cercocarpus parvifolius betuloides (Birchleaf mahogany ) 57 



Cercocarpus parvifolius paucidentatus (Entireleaf mahogany) 57 



Adenostoma sparsifolium (Red-shank chamiso) 57 



Amelanchier alnifolia ( Western service tree) 57 



Heteromeles arbutif olia ( Christmas berry ) 57 



Prunus demissa ( Western choke cherry) 58 



Prunus salicifolia ( Willowleaf cherry; Mexican cherry ) 58 



Prunus ilicifolia (Hollyleaf cherry) 58 



Prunus integrifolia ( Entireleaf cherry ) 58 



Acacia farnesiana ( Huisache) 58 



Acacia greggii ( Devils claws) 59 



Prosopis odorata (Tornillo; screw bean) 59 



Prosopis glandulosa (Mesquite) 59 



Cercis reniformis (Texas redbud) 60 



Parkinsonia aculeata ( Horse bean ) 60 



Parkinsonia microphylla (Smallleaf horse bean) 60 



Cercidium torreyanum (Palo verde) 61 



Sophora secundiflora ( Frijolillo; Coral bean) 61 



Eysenhardtia orthocarpa ( Eysenhardtia ) 61 



Parosela spinosa (Indigo thorn; mangle) 61 



Robinia neomexicana (New Mexico locust) 62 



Olneya tesota (Sonora ironwood; Palo de hierro) 62 



Ptelea trifoliata ( Hoptree) 62 



