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- 
eolored. 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 seale-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- 
eoid genus Arceuthobium. 
Caneseent: twigs terete: spikes several-jointed: sepals meeting in 
fruit. P. californicum. 
Glabrous: twigs often bluntly squarish: spikes 1-jointed: sepals usually 
parted in fruit. 
Seales not constricted at base: stout. On Juniperus. 
Р. juniperinum. 
Seales obscurely constricted: slender and pendent. On Libocedrus. 
P. Libocedri. 
Seales eonstrieted as if by a string: eompaet. On Juniperus. 
» P. ligatum. 
” PHORADENDRON CALIFORNICUM Nuttall. 
Phoradendron californicum Nuttall, Journ. Aead. Philadelphia. ser. 2. 
vol. 1. p. 185. 1848.—MaeDougal, Publ. Carnegie Inst. по. 99. pl. 60. 
Not forked, the long slender somewhat reddish branches without 
eataphyls, 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. 
