. 
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. U.S. Surv. 100th Merid. 6: 253. 
1878. 
Tyre Locauity: ‘‘On Pseudotsuga douglasit 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.” 
Ranae: Idaho to Arizona and New Mexico. 
New Mexico: Santa Fe Canyon; Tunitcha Mountains. On Pseudotsuga mucronata. 
5. Razoumofskya microcarpa (Engelm.) Woot. & Standl. 
Arceuthobium douglasit microcarpum Engelm. in Wheeler, Rep. U. 8. Surv. 100th 
Merid. 6: 253. 1878. 
Type Locatity: ‘Parasitic on Picea Engelmanni, found by Mr. Gilbert in 1873 
(100 and 102) in the Sierra Blanca, Arizona.”’ 
Rance: 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 
species. 
2. PHORADENDRON Nutt. Mistietor. 
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, monecious, in jointed axillary spikes; calyx usually 
3-parted; fruit a semitransparent 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 
JuMIperus, )... 2.22 e ee eee eee eee ees 1. P. juniperinum. 
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,)..... 2.0.2. eee eee eee cee eens 2. P. bolleanum. 
Leaves broader and larger, more than 12 mm. long, 10 mm, 
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 otherhard-wood trees.) 3. P. orbiculatum. 
Leaves attenuate to the longer petiole, obovate or oblan- 
ceolate, not densely pubescent, usually glabrous. 
Leaf blades conspicuously yellowish green, oblong 
orobovate, (Usually on Populus wislizeni.). 4. P. macrophyllum. 
Leaf blades only slightly yellowish, oblanceolate.. 5. P. flavescens. 
