1921] Smiley: Flora of the Sierra Nevada of California 157 



1. Arceuthobium americanum Nutt. ; Engelm., in Gray, Jour. 



Bost. Soc. Nat. Hist., vol. 6, p. 214. 1850. 



Rasoumofskya americana (Nutt.) Kuntze, Rev. Gen. PL, vol. 2, p. 587. 

 1891. 



Type locality. Oregon. 



Range. British Columbia to Saskatchewan, south to California 

 and Colorado. 



Zone. Canadian, growing only on Pinus Murrayana. 



Specimens examined. Near Donner Lake, Tahoe, Dudley, June 7, 

 1893; Mayers meadow near Truckee, C. F. Sonne; Little Yosemite 

 Valley, Bolander 5095; North Fork of Kings River, Tulare County, 

 7,000 feet, Hall and Chandler 426. 



2. Arceuthobium Douglasii var. abietinum Engelm., Bot. Calif., 



vol. 2, p. 106. 1880. 



Type locality. "In Sierra Valley (/. G. Lemmon) and S. Utah, 

 Parry." 



Range. California to Washington and Utah. 



No specimen of this mistletoe has been seen; it is here included 

 because Hell 101 reports it to grow upon Abies magnifica in the Yosemite 

 region. 



3. Arceuthobium campylopodum Engelm., in Gray, Jour. Bost. 



Soc. Nat. Hist., vol. 6, p. 214. 1850. 



A. occidentale Engelm., in Wats., , Bot. Calif., vol. 2, p. 107. 1880. 

 EazoumofsTcya campylopoda (Engelm.) Piper, Contr. Nat. Herb., vol. 11, 

 p. 222. 1906. 



Type locality. "Oregon, on Pinus ponderosa." Collected by 

 Geyer and the region being in fact northern Idaho. 



Range. British Columbia south to California in both the Sierra 

 and Coast Range. 



Zone. Transition and entering the Canadian. Growing mainly 

 on Pinus. 



Specimens examined. Mt. Tallac on P. Jeffreyi, Dudley, June 8, 

 1893 ; Silver Mountain, north side at 7,000 feet, on Juniperus occi- 

 dentalis, Brewer 2055; near Cloud's Rest, Yosemite, Chesnut and 

 Drew, July 13, 1889 ; Snow Creek, Yosemite, on P. Jeffreyi, 6,600 feet, 

 H. M. Hall, July 26, 1911 ; Mt. Pinos, 8,000 feet, Rothrock 213. 



In Washington, this mistletoe has been found parasitic on Tsuga 

 Mertensiana (Allen 303, Upper Nisqually Valley) but, so far as I 

 know, the Alpine Hemlock has not been found to be attacked in the 

 Sierra. 



