20 The Philippine Journal of Science iwh 
Canarium indicum. In compiling the enumeration of Guam 
plants given below, I have included most of those species enumer- 
ated by Safford, even when I have seen no Guam botanical 
material representing them. The list has been increased from 
about 386, enumerated by him, to about 550, not including the 
cellular cryptogams in either case. It is anticipated that* future 
botanical exploration of Guam will yield many additional species, 
and it will not be at all surprising should the list of ferns and 
seed-plants eventually be greatly extended. 
The flora of Guam is essentially Malayan, practically all the 
indigenous genera found in the island being of wide Indo-Ma- 
layan distribution and no single genus being endemic. The 
nearest approach to an endemic genus is Saffordiella, which, 
aside from its Guam station, is also found in the Island of Yap, 
in the Carolines, and which will doubtless be found later in other 
islands of both the Marianne and the Caroline groups. Of the 
total of 545 species of pteridophytes and spermatophytes found 
in Guam, indigenous and introduced, 462, or about 86 per cent, 
are also found in Malaya; while 475, or 89 per cent, are found 
in other parts of Polynesia and Micronesia; and 415, or about 
76 per cent, in continental Asia. 
As to floristic alliances, no special ones are indicated by the 
Guam flora as we now know it. We have, so far as known, 
Lygodium semihastatum, Halophila ovata, Bulbophyllum pro- 
fusion, and Carex fuirenoides known only from Guam and the 
Philippines, and Saffordiella bennigseniana, Panax macrophylla, 
and Ixora triantha known only from Guam and the Island of Yap 
in the Carolines. The Philippine Archipelago and the Caroline 
group are the natural alliances of the Guam flora and a certain 
number of species confined to Guam and to one or the other of 
the above groups are to be expected especially in view of the 
fact that more than 80 per cent of the species found in Guam are 
also found in the Philippines and probably nearly as many ex- 
tend to the Carolines. 
Taking into consideration its rather isolated position, and 
considering also the total number of species known from Guam, 
the percentage of endemism is surprisingly low. But about 61 
species, or only 11 per cent, are endemic, that is, confined to 
Guam. If, however, we exclude from consideration those species 
that manifestly have been introduced into Guam by man, and 
for a large part within the historical period, the showing is 
rather different. I consider that no less than 314 species, or 
about 58 per cent of the total number of species known from 
