WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 179 



4. Razoumofskya douglasii (Engelm.) Kuntze, Rev. Gen. PL 2: 587. 1891. 

 Arceuthobium douglasii Engelm. in Wheeler, Rep. TJ. S. Surv. 100th Merid 6* "53 



1878. 



Type locality: "On Pseudotsuga douglasii from New Mexico (on Santa Fe River, 

 Rothrock, No. 69, 1874) to Utah, Parry, Siler, and Northern Arizona, Camp Apache 

 G. K. Gilbert (109), 1873." 



Range: Idaho to Arizona and New Mexico. 



New Mexico: Santa Fe Canyon; Tunitcha Mountains. On Pseudotsuga mucronata. 



5. Razoumofskya microcarpa (Engelm.) Woot. & Standi. 



Arceuthobium douglasii microcarpum Engelm. in Wheeler, Rep. TJ. S. Surv. 100th 

 Merid. 6: 253. 1878. 



Type locality: "Parasitic on Picea Engelmanni, found by Mr. Gilbert in 1873 

 (100 and 102) in the Sierra Blanca, Arizona." 



Range: Arizona and New Mexico. 



New Mexico: West Fork of the Gila {Metcalfe 493). On Picea. 



The specific name is misleading, for the fruit seems to be no smaller than in related 

 Bpecies. 



2. PHORADENDRON Nutt. Mistletoe. 



Plants parasitic on the branches of trees and shrubs; stems brittle, woody, jointed, 

 much branched; leaves entire, thick and firm (or reduced to scales), persistent; 

 flowers small and inconspicuous, monoecious, in jointed axillary spikes; calyx usually 

 3-parted; fruit a semi transparent berry crowned with the persistent sepals. 



The various species of Phoradendron found in New Mexico are among our com- 

 monest and most conspicuous plants, being found upon one or more kinds of trees in 

 almost every locality. They are true parasites, growing from seeds deposited, usually 

 by birds, on the branches of trees. The mistletoe does great injury to trees, espe- 

 cially the valley cottonwood, where planted for shade. Some species have been 

 observed on cultivated fruit trees. The plants when covered in the winter with their 

 handsome white berries are extensively used as Christmas greens. In some parts of 

 the State large quantities of mistletoe are gathered and sold each year, the larger 

 amount being shipped east. 



KEY TO THE SPECIES. 



Leaves reduced to scalelike ovate bracts 2 mm. long or less. (On 



Juniperus.) 1. P. juniperintan. 



Leaves foliaceous, 6 to 60 mm. long. 



Leaves elliptic, 6 to 12 mm. long, 4 mm. wide or less; spikes 

 of the inflorescence very short, few-flowered. (On 



Juniperus.) 2. /'. bollcanum. 



Leaves broader and larger, more than 12 mm. long, 10 nun. 

 wide or more; spike long and many-flowered. 

 Leaves abruptly contracted into a short stout petiole, 

 usually orbicular or orbicular-oblong, densely 

 pubescent. (On oaks and other hard-wood trees.) :?. P. orbiadatwn. 

 Leaves attenuate to the longer petiole, obovate or oblan- 

 ceolate, ool densely pubescent, usually glabrous 

 Leaf blades conspicuously yellowish green, oblong 



orobovate. (Usually on Populiuvritlizeni.). t. /'. trutcrophyllitm. 

 Leaf blades only slightly yellowish, oblanceolate. . •"•. /'../' 



