IX, C, 1 Merrill: Plants of Guam 19 
were entirely destroyed. During d’Urville’s visit to Guam in 
1828 in the “Astrolabe” botanical collections were made by 
Lesson, and during his second visit to the island in the “Astro- 
labe” and “Zelée” in 1839, additional collections were made by 
Hombron. I have found no record of any other botanical collec- 
tions made in Guam since 1839 up to the time of the American 
occupation at the close of the last century, except a few references 
to Marianne Islands plants collected by Marche in 1889. Mr. 
Safford informs me that he made no comprehensive botanical 
collections during his period of residence in Guam from August, 
1899, to August, 1900. Some material was collected at that time 
by Mr. Alvin Seale and is now deposited in the Bishop Museum at 
Honolulu. 
The first botanical material I received from Guam was a 
small collection of 25 specimens made, at my suggestion, by 
Mr. J. B. Thompson, director of the Guam Experiment Station, 
November, 1910. A year later Mrs. Joseph Clemens brought 
to Manila a collection of 37 species collected by her in Guam 
during the few hours stop of the U. S. Army transport at 
Agana, November 27, 1911, on which she was a passenger. 
In September, 1911, at the suggestion of Mr. Thompson, Mr. 
R. C. McGregor of the Bureau of Science went to Guam for 
the purpose of making botanical collections. Mr. McGregor 
remained there from October 2 to October 26, in that time collect- 
ing 282 numbers, most species represented by several duplicates. 
At the same time he trained a native collector who continued the 
work intermittently under Mr. Thompson’s direction from No- 
vember, 1911, to July, 1912; this native collector secured a total 
of 480 numbers. In all I have had for examination about 824 
numbers of Guam plants, on which the following enumeration 
is primarily based. 
In his “Useful Plants of Guam” Safford enumerates about 
386 species, and his list includes not only the plants that are 
of greater or less economic use, but all species, whether useful 
or not, that were known by him to occur in Guam. The list is 
based on the comparatively small collections made by Safford, 
on his copious notes, on some botanical material secured from 
residents of Guam subsequent to his departure, and especially 
on the published references to Guam plants based on the collec- 
tions of Haenke, Née, Gaudichaud, Hombron, Chamisso, and 
Lesson. Some species were admitted as representatives of the 
flora without the examination of Guam material; for example, 
Fi 
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