43 
convincing proofs of which are afforded in the present collection. The 
following instances may be quoted. 
All the mountains of New Guinea show a preponderating number of 
species belonging to Rhododendron and Vaccinium in Ericaces and Styphelia 
in Kpacridaceze, though but few identical species have been so far recorded ; 
but that this point is only a question of further investigation is proved by the 
distribution of the very distinct Rk. Vonroemeri, which, most abundant in 
the Arfak, is recorded for the Cyclops Mountains in the north, and from 
the Hellwig Mountains and Mt. Carstensz in the south-west (=R. calceo- 
larioides Wernham). Medinilla Forbesti, collected in the south-east and the 
south-west, is now established for the north-west as well, while Timonius 
filipes and Podocarpus papuanus, first collected on Mt. Carstensz, are 
common on the Arfak at higher altitudes. Quercus Lauterbachii} and 
Scevola Lauterbachii,’ generally collected in the north-east, were not pre- 
viously known from Dutch N.W. New Guinea. 
In small herbaceous plants two new species of Didiseus link up the 
Arfak with the Owen Stanley range in the south-east, while /Mriocaulon 
leucogenes, Trisetum latifolium, and Gentiana Vanderwateri are common to 
the former and Mt. Carstensz. Spiranthes papuana is now known from the 
north-east and north-west, Platanthera elliptica from north and south-west. 
New species in genera tirst recorded from New Guinea through Kloss’s 
Carstensz collections, such as Zrimenia and Backhousia, are now proved to 
be common to the Arfak as well; also the genera Pullea and Sericolea, 
the latter represented by six species in the north-east, one in the south-east, 
three on Mt. Carstensz, and now by two in the Arfak; while Libocedrus, 
known from the north-east, south-east, and south-west, and Dacrydium from 
the north-east, south-west, and south-east, are abundantly represented by 
one very distinct species each in the Arfak. 
3. THE LOW MOUNTAIN FOREST FORMATION APPROXIMATES TO THE 
RIDGE FORMATION OF MT, KINABALU AND THE PHILIPPINES, 
The low forest formation approximates very closely to that of the 
serpentine ridges of Kinabalu from 7000’, but with a larger proportion of 
what I would have previously described as southern hemisphere types, but 
prefer now to refer to as Papuan. 
Identical plants so far recorded are Phyllocludus hypophyllus, Myrtus 
flavida var. glabrescens, a glabrous variety of the Kinabalu plant, while 
closely allied species occur in Dawsonia, Podocarpus, Ducrydium, Centrolepis, 
Patersonia, Didiscus, Gentiana, and others. 
* Schumann, K., and Lauterbach, K., ‘Flora der deutschen Schutzgebiete in der Siidsee,’ 
Leipzig, 1901. Nachtrige, 1906. 
