642 Part IV. Chapter 5. 
Limestone cliffs in the Chiricahua Mountains are characterized by fine specimens of Morus 
celtidifolia, Quercus undulata, Bumelia spinosa, while along the wash from White River Canyon 
rew Chilopsis saligna, Salix nigra var. venulosa, S. longifolia var., Platanus Wrightii, Fraxinus 
velutina, Juglans rupestris. At the entrance to the canyon are Juniperus pachyphloea, J. mono- 
perma, Quercus Emoryi and Alnus oblongifolia. The mountain slopes are characterized by large 
areas of scrub oak composed of Quercus rer Q. hypoleuca, Q. chrysolepis var. vaccinifolia 
and on the upper slopes among the pine Q. Gambelii and Q. reticulata.. Yucca macrocarpa 
oceurs throughout the south and central portions of the Chiricahua Mountains, while Yucca bac- 
a grows on the east slopes and Y. elata on the flanking mesas. At higher elevations are 
a Pinus cembroides, P, chihuahuana and P. ponderosa. Pinus cembroides, covers with a 
rather dense forest, the highest slopes of these mountains, Abies concolor, Pseudotsuga Douglasii 
and Cupressus arizonica are not infrequent in canyons above 5,000 feet while Pinus reflexa grows 
on the summits. In some of the canyons are found Acer grandidentatum, Negundo aceroides and 
Prunus serotina?). Cercocarpus parvifolius var. paueidentatus and Rhamnus Purshiana var. tomen- 
tella are frequent throughout the entire range, while large areas in the valleys are covered with 
a stunted growth of Prosopis juliflora and Koeberlinia spinosa. 
Over fifty-five species of trees are reported from the Chiricahua Mountains 
as follows: 
Condalia obovata Hook. Bumelia spinosa Wats. (=B.lanuginosa 
Koeberlinia spinosa Zucc. Michx. var. rigida A. Gray). 
ee Purshiana DC. Fraxinus velutina Torr. (= F. pistaciae- 
urshiana tomentella Benth. folia Torr.). [Cav.). 
Acer ER SERERTRGL NDEL. var. ır.(=Acer Chilopsis saligna Don (— C. linearis 
Celtis mississippiensis Bosc. var. reti- 
Negundo aceroides Moench Fe Äcer culata Sarg. 
negundo L.). Morus celtidifolia H.B.K. 
Sapindus marginatus Willd. Platanus Wrightii Wats. 
Acacia Berlandieri. Juglans rupestris Engelm. 
>  Greggii A. Gray. Quercus Gambelii Nutt. 
Prosopis juliflora DC. > undulata Torr. 
Parkinsonia Torreyana Wats. » oblongifolia Torr. 
> microphylla Torr. » grisea Liebm. 
Eysenhardtia orthocarpa Wats. > reticulata H.B.K. 
Prunus serotina Ehrh. » chrysolepis Liebm. var. vac- 
Vauquelinia californica Sarg. cinifolia Engelm. 
Cercocarpus parvifoliusNutt. var. pauci- > Emoryi Torr. 
dentatus Watson. >» hypoleuca Engelm. 
Cereus (Carnegiea) giganteus EN Alnus oblongifolia Torr. (= A. acu- 
Opuntia arborescens Engelm Salix nigra Marsh. . [minataH.B. K.). 
»  fulgida Engelm. >»  longifolia Muhl. var. 
Sambucus mexicana DC. Populus tremuloides Michx. 
Arbutus arizonica Sarg. » Fremontii Wats. 
ı) ToumEv, J. W.: Notes on the tree Flora of the Chiricahua Mountains. Garden and 
Forest VIII: ı2, 22; BLumer, J. C.: On the plant Geography of the Chiricahua Mts., Ariz. 
Science new ser. XXX: 720— 724. 
