VI TABLE OP CONTENTS. 



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



Populua augustif olia ( Narro wleaf cotton wood ) 47 



Populus fremontii (Fremont cottonwood) 48 



Alnus oregona (Eed alder) 49 



Quercus gambelii (Gambel oak) 49 



Quercus breviloba (Durand oak) 50 



Quercus undulata (Rocky Mountain oak ) 50 



Quercus engelmanni (Engelmann oak; evergreen white oak) 50 



Quercus oblongifolia (Oblongleaf oak; blue oak) •. 50 



Quercus arizonica (Arizona white oak) .- 51 



Quercus reticulata (ISTetleaf oak) - 51 



Quercus toumeyi (Tourney oak) 51 



Quercus dumosa (California scrub oak) 52 



Quercus emorj'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 californi'ca (California black oak) 54 



Ulmus crassifolia (Cedar elm) 54 



Oeltis occidentalis ( Hackberry ) 54 



Celtis reticulata (Palo bianco) 55 



Celtis mississippiensis (Sugarberry ) 55 



Morus rubra (Red mulberry) 55 



Horus celtidifolia (Mexican mulberry) 55 



Umbellularia californica (California laurel) 56 



Lyonothamnus floribundus asplenifolius (San Clemente ironwood) 56 



Platanus occidentalis (Sycamore) . .' 56 



Platanus racemosa (California sycamore) 56 



Platanus wrightii (Arizona sycamore) 56 



Vauquelinia californica ( Vauquelinia) 57 



Cercocarpus parvif olius betuloides (Birchleaf mahogany ) 57 



Cercocarpus parvifolius paucidentatus (Entireleaf mahogany) 57 



Adenostoma sparsifolium (Red-shank chamiso) 57 



Amelanchier alnifolia ( Western service tree) 57 



Heteromeles arbutifolia (Christmas berry) 57 



Prunus demissa (Western choke cherry) 58 



Prunus salicif olia ( Willo wleaf cherry ; Mexican cherry ) 58 



Prunus ilicifolia (Hollyleaf cherry) 58 



Prunus integrifolia (Entireleaf cherry) 58 



Acacia farnesiana (Huiaache) 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 microphy 11a ( Smal lleaf horse bean ) 60 



Cercidium torreyanum (Palo verde) 61 



Sophora seoundiflora (Frijolillo; Coral bean) 61 



Eysenhardtia orthocarpa (Eysenhardtia) 61 



Parosela spinosa (Indigo thorn; mangle) 61 



Eobinia neomexicana (New Mexico locust) 62 



Olneya tesota (Sonora ironwood; Palo de hierro) 62 



Ptelea trifoliata (Hoptree) 62- 



