Mistletoe in the Southwest. 243 



MISTLETOE SPECIES. .', HOST SPECIES. 



Razoumofskya robusta (Englin.) Kuntze 



R. cryptopoda (Engelm.) Coville Pinus arizonica Engelm. 



Razoumofskya cyanocafpa A. Nels? Pinus strobiformis Engelm. 



Razoumofsk)-a robusta (Engelm.) Kuntze Pinus mayriana Sudw. 



Razoumofskya divaricata (Engelm.) Kuntze* 



Pinus chihuahuana Engelm. 



Phoradendron junij^erinum Engelm Juniperus pachyphloea Torr. 



Phoradendron juni])erinum Engelm Juniperus monosperma Engelm. 



Phoradendron bolleanum Eichler Juniperus pachyphloea Torr. 



Phoradendron bolleanum Eichler Juniperus monosperma Engelm. 



Phoradendron flavescens Nutt Fraxinus velutina Torr. 



Phoradendron flavescens Nutt Fraxinus sp. 



Phoradendron flavescens Nutt Populus Fremontii Wats. 



Phoradendron flavescens Nutt Populus angustifolia James. 



Phoradendron flavescens Nutt.; Salix nigra Marsh. 



Phoradendron flavescens Nutt Salix taxifolia HBK. 



Phoradendron flavescens Nutt. Juglans rupestris Engelm. 



Phoradendron flavescens Nutt Platanus Wrightii Wats. 



Phoraderdron flavescens villosum Engelm Quercus arizonica Sarg. 



Phoradendron flavescens villosum Engelm Quercus Em.5ryi Torr. 



Phoradendron flavescens villosum Engelm Quercus oblongifolia Torr. 



Phoradendron flavescens villosum Engelm .Quercus reticulata HBK. 



Phoraderdron flavescens orbiculatum Engelm Quercus Toumeyi Sarg. 



Phoradendron flavescens macroph^Uum Engelm 



Fraxinus velutina Torr. 



Phoradendron californicum Nutt Prosopis velutina Wooton. 



In the Santa Catalina range occurs a /nost interesting form 

 of Phoradendron on white fir (Abies concolor), the onlv instance 

 yet noted of a mistletoe with leaves growing upon a needle-leaf 

 host. As early as 1880 Dr. Kngel-nann records it upon the same 

 host as an unusual form allied to P. bolleanum. It is distinct 

 in lack of pubescence and general forn, and very decidedlv so 

 in habitat and host. As already noted, P. bolleanum is common 

 at about 5,000 feet elevation in the Chiricahuas, ascends on the 

 alligator juniper {Juniperus pachyphloea) to approxim.ately 

 6,500 feet on the Swisshelms, and on the one-seeded jiuiiner 

 (/. monosperma) descends to 3,500 feet above Vail, and equally 

 low in Canon de los Alisos, which transects the Mexican bound- 

 ary. It was also noted on alligator juniper near Oro Blanco 

 Peak, elevation about 4,500 feet. This region, known as the 

 Pajarita mountains, was found devoid of P. juniperinum but on 

 the east side of the Santa Ritas this species was found abundant 



♦Probably wrongly distributed as R. vaginata. It resembles R. divaricata but as it has 

 not been found on the pinyon hosts of this species, and does occur on Pinus chihuahuana, 

 and as this belongs to a group of pines that are the hosts of R. americana, it may be the 



latter or an allied species. 



