ORCHIDACE^E HALCONENSES: AN ENUMERATION OF THE 
ORCHIDS COLLECTED ON OR NEAR MOUNT HALCON, 
MINDORO, CHIEFLY BY ELMER D. MERRILL. 
By Oakes Ames, A. M., F. L. S. 
Most of the orchirds enumerated in this paper were collected by Elmer 
l). Merrill in Mindoro at high altitudes on Mount Halcon. In addition, 
those species have been included here which were found near Mount 
Halcon during April and May, 1905, by R. C. McGregor, and in June, 
1906, by M. L. Merritt. Among the species are many known to come 
from Java, Sumatra and Borneo; and, aside from the new ones, which 
constitute about half of the orchids in this paper, there are several 
interesting additions to the Philippine flora. 
I have adopted the sequence of genera proposed by Pfitzer in Engler 
& Pr anti’s “Die natiirlichen Pflanzenfamilien” and have arranged the 
species alphabetically under their respective genera. The notes relative 
to the geographical distribution of species that occur outside of the Phil- 
ippine Islands have been made from lists and floras; therefore they are 
not definitive, as closely allied species are not infrequently confused by 
authors, and their ranges consequently exaggerated. 
The types of the new species herein described are in the herbarium of 
the Bureau of Science at Manila. Usually cotypes are to be found in 
my own herbarium. 
IMEUWIEDIA Bl. 
N. veratrifolia Bl. in Hoev. & De Vriese, Tijdschr. 1 : 142 (1834). 
Terrestrial, ridge forest, ' at 2,300 ft. alt. on Mount Halcon, flowers yellow, 
Nov. 8, 1906, Merrill (No. 5681). 
APOSTASIA Bl. 
Apostasia Wallichii R. Br. Wall. Cat. 4448 (1828). 
Terrestrial in ridge forest at 3,000 ft. alt. on Mount Halcon, flowers yellowish 
(old), probably white when young, Nov. 10, 1906, Merrill (No. 5521). Terrestrial 
in humid forest on ridge at about 1,000 ft. alt. on Mount Halcon, flowers odorless, 
yellowish white, Nov. 2, 1906, Merrill (No. 5639). 
Nepal, Assam, Kliasia, Perak, Ceylon, Penang, Sumatra, Borneo, Java, New 
Guinea. Doubtfully ascribed to Luzon, P. I. 
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