AMERICAN 
JOURNAL OF BOTANY 
Vol. IV December, 1917 No. 10 
THE PHYTOGEOGRAPHY OF MANGA VALLEY, 
HAWAIIAN ISLANDS 
Vaughan MacCaughey 
The present paper represents the first effort, in the long history 
of botanical exploration in the Hawaiian Archipelago, to make a 
detailed ecological survey of a representative Hawaiian phytogeo- 
graphic area. Taxonomic lists and descriptions of new species com- 
prise the bulk of the scientific literature dealing with the Hawaiian 
flora, and in all of this material there is a conspicuous absence of 
physiographic and ecologic data. The present paper is based upon 
field observations extending over a residence of nine years on the 
island of Oahu, of which time four years have been passed in Manoa 
Valley itself. The writer has repeatedly visited all portions of this 
beautiful and historic valley, and has conducted many collegiate field 
excursions to the numerous points of prime botanic interest. 
The writer has availed himself of all accessible records. The 
nomenclature followed has been chiefly that of Hillebrand's monu- 
mental Flora of the Hawaiian Islands (1888). Although this nomen- 
clature is somewhat obsolescent, it is in common usage in the island 
literature, and it was deemed inadvisable to cumber too greatly these 
pages with revised names of familiar plants. In numerous instances 
however, the modern taxonomy has been introduced. 
The College of Hawaii is situated in Manoa Valley, near Honolulu. 
This valley is the immediate natural background of the College and 
its botanical instruction. Manoa is a representative ecologic area of 
the Hawaiian mountains. It presents a very clearly defined series of 
life zones, both in vertical and horizontal planes. It is typical of 
many valleys in the Hawaiian Islands, and in other parts of the 
Polynesian Pacific. The phytogeography of Manoa Valley epitomizes 
that of any similar physiographic region in the archipelago. 
561 
DEC 14)9 
