20 THE GENUS PHORADENDRON 



Branches broadly winged: receptacular cups often cleft into sepal-like 

 segments : pistillate flowers numerous. CALYCULATAE. 



A. PAUCIFLORAE. 



Stems not winged. Spikes short, 1- to 4-jointed, each joint with 2 

 opposite flowers when pistillate or with 4 8 or 12 flowers in 4 or 6 

 series when staminate: receptacular cups not calyx-like. Berries sub- 

 globose, smooth and glabrous, small (3-4 mm.), tinged reddish or straw- 

 colored. Western United States, and Mexico as far as Mt. Orizaba. 

 All except the first species occur on conifers. 



Leaves represented by short thin scales, not disarticulating. 



APHYLLAE. 

 Leafy, or in the first with scale-shaped but disarticulating leaves. 



BOLLEANAE. 



1. APHYLLAE. 



Leaves represented by short thin scales not disarticulating from the 

 stem. Essentially confined to the desert and western mountain region 

 of the United States. Frequently confused by collectors with the Vis- 

 coid genus Arceufhobium. 



Canescent: twigs terete: spikes several- j ointed : sepals meeting in 

 fruit. P. californicum. 



Glabrous : twigs often bluntly squarish : spikes 1-jointed : sepals usually 

 parted in fruit. 



Scales not constricted at base : stout. On Juniperus. 



P. juniperinum. 



Scales obscurely constricted: slender and pendent. On Libocedrus. 



P. Libocedri. 

 Scales constricted as if by a string: compact. On Juniperus. 



-P. ligatum. 



PHORADENDRON CALIFORNICUM Nuttall. 



Phoradendron californicum Nuttall, Journ. Acad. Philadelphia, ser. 2. 

 vol. 1. p. 185. 1848. MacDougal, Publ. Carnegie Inst. no. 99. pi. 60. 

 Not forked, the long slender somewhat reddish branches without 

 cataphyls, dioecious. Internodes short (1-3x10-20 mm.), from softly 

 and closely lanate-canescent becoming glabrous. Stem-scales spread- 

 ing, acute, 2 mm. long. Spikes axillary, mostly solitary, minutely 

 canescent, long for the group (5-10 mm.), with about 4 short joints 2- 

 or exceptionally 4- or 6- flowered in 2 or 4 series : peduncle 1-3 mm. long : 

 scales acute. Fruit red, subglobose, often rostrate, 3 mm. in diameter: 

 sepals nearly or quite meeting. Plates 8, 11. 



