43 



convincing proofs of which are afforded in the present collection. The 

 following instances may he quoted. 



All the mountains of New Guinea show a preponderating number of 

 species belonging to Rhododendron and Vaccinium in Ericaceae and Styphelia 

 in Epacridacese, 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 R. Vonroemeri, which, most abundant in 

 the Arf'ak, is recorded for the ( Cyclops Mountains in the north, and from 

 the Hellwig Mountains and Mt. Carstensz in the south-west ( = 72. calceo- 

 larioides Wernham). Medinilla Forbesii, 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 1 and 

 / SccBvola 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 Didiscus link up the 

 Arfak with the Owen Stanley range in the south-east, while Eriocaulon 

 leucogenes, Trisetum latifolium, and Gentiana Vandencateri are common to 

 the former and Mt. Carstensz. Spirantlies papuana is now known from the 

 north-east and north-west, Platanthera elliptica from north and south-west. 

 New species in genera first recorded from New Guinea through Kloss's 

 Carstensz collections, such as Trimenia 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. KIN ABA LU 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 liypophyllus, Myrtus 

 jiavida var. ylabrescens, a glabrous variety of the Kinabalu plant, while 

 closely allied species occur in Dawsonia, Podocarpus, Ducrydium, Centrolepis, 

 Patersonia, Didiscus, Qentiana, and others. 



1 Schumann, K., and Lauterbacli, K., ' Flora der deulachen Schutegebiete in der Siidsee,' 

 Leipzig, 1901. Naclitrage, 1905. 



