26 
The Philippine Journal of Science 
1914 
such species as Urena lobata L., Bidens pilosa L., Eclipta alba 
Hassk., Solanum nigrum L., Merremia umbellata Hallier, Hewit- 
tia sublobata O. Ktze., Melochia corchorifolia L., Abelmoschus 
moschatus Medic., Sida retusa L., S. rhombifolia L., S. acuta 
Burm., S. cordifolia L., Phyllanthus niruri L., P. urinaria L., 
Euphorbia prostrata Ait., E. thymifolia L., E. hirta L., Oxalis 
repens Thunb., Teramnus labialis Spreng., Desmodium triflorum 
DC., Gynandropsis pentaphylla DC., Cleome viscosa L., Portu- 
laca oleracea L., Mollugo oppositifolia L., M. lotoides L., Amaran- 
thus spinosus L., A. viridis L., Alternanthej'a sessilis R. Br., Com- 
melina nudiflora L., and numerous grasses and sedges. While 
some of these, such as Portulaca oleracea L., and some of the 
grasses and sedges, may have been distributed from one hemi- 
sphere to the other by natural means, there is very little doubt but 
that the most of them have been transmitted across the Pacific 
or the Atlantic by man within historical times, and in this period 
since the circumnavigation of the globe by Magellan in 1521. I 
am now inclined to the opinion that most of the species enumer- 
ated above are natives of the eastern hemisphere, but have no 
definite data to this effect except in the case of a few species such 
as Hibiscus abelmoschus Medic. 
In my consideration of the pantropic plants found in and about 
Manila, I made a detailed tabulation of the species, but do not 
consider it necessary or expedient to make such a tabulation for 
the Guam plants of similar distribution. The enumeration of 
such plants found in Guam would, to a very large degree, simply 
duplicate those found in and about Manila. The Guam flora 
adds to the list of pantropic plants considered in my previously 
mentioned paper, about 24 species, nearly all of which are found 
in the Philippines but not in or near Manila. The additions 
are Asplenium caudatum Forst., Nephrolepis hirsutula Presl, 
Gleichenia linearis Clarke, Lycopodium cernuum L., Psilotum 
nudum Griseb., Potamogeton lucens L., Fimbristylis complanata 
Link., F. puberula Michx., F. spathulacea Rottb., Chenopodium 
album L., Entada phaseoloides Merr., Caesalpinia glabra Mill., 
Dodonoea viscosa Jacq., Sida glomerata Cav., Ammannia coccinea 
Rottb., Ximenia americana L., Ipomoea gracilis R. Br., Cestrum 
diurnum Lam., Physalis lanceifolia Nees, Heliotropium curassa- 
vicum L., Hyptis pectwiata Pois., Geophila herbacea 0. Ktz., 
Adenostemma viscosum Forst., and Mitracarpum hirtum DC. 
At least sixteen of the twenty-four will fall in the category of 
those plants that have been spread from one hemisphere to the 
other through natural causes. Of the remaining eight, two are 
