BOTANY: W. TRELEASE 
35 
South America: (10) Andean, (11) Peruvian and Bolivian, (12) Argen- 
tine, (13) Brazilian upland, apparently with less differentiation than 
would be thought between the arid and humid portions, (14) Amazonian, 
(15) Cayenne, and (16) Venezuelan. 
West Indies: (17) Caribbean, (18) Antillean, to the north of the 
Anegada passage, and (19) Bahamian. 
Few species range throughout any one of these regions, and it is very 
rare for a species to reach from one into the other. 
Briefly summarized, the purely taxonomic part of my study of the 
genus leads to the conclusion that Phoradendron may be best divided 
into two primary groups, respectively constantly without and con- 
stantly with cataphyls on their foliage shoots: for the first I am using 
the name Boreales, since its species alone are represented in the north; 
and for the other, Aequatoiuales, since its species only are found in 
the equatorial region. Species destitute of expanded foliage are found 
in each group in small numbers. Those of the first group are pubescent 
for the most part, while only two of the second group are more than 
papillately roughened. The Boreales appear to be strictly dioecious; 
the Aequatoriales for the most part, though not exclusively, are monoeci- 
ous, usually with some or all of their spikes androgynous. 
So far as shown by the material now contained in the great herbaria 
at Washington, New York, St. Louis, Chicago, Brussels, Copenhagen, 
Kew, Munich (where von Martins' official collection is), Geneva, Buda- 
pest, Prag, and Dahlem, and in many smaller collections, I find a total 
of 262 differentiable forms, most of which I regard as species, and of which 
60, or 2 3 percent, are of the Boreales and 202, or 77 percent, Aequatori- 
ales. Of the Boreales, 41, or two- thirds, and of the Aequatoriales, 85, 
or two-fifths, are characterized as new. 
The distribution of the main groups (species which occur in more than 
one region being included in each) is: 
Boreales 
Aequatoriales 
26 
0 
Mexico Cenir. Atner. W.Indies S.Amer. 
45 1 0 0 
25 23 34 124 
26 
70 
24 
34 
124 
