* is, a ae ad 
308 MERRILL AND MERRITT. 
identical with a New Zealand form, Dianella caerulea Sims, New Guinea 
and Australia, Clematis macgregorit Merr., allied to forms found in 
Australia and southeastern Malaya, Halorrhagis micrantha R. Br., 
Leptospermum flavescens Sm., and Drimys piperita Hook. f., representa- 
tives of typical Australasian genera, Yuphrasia borneensis Stapf, Veronica 
monantha Merr., and Ranunculus philippinensis Merr. & Rolfe, although 
representing genera characteristic of the north temperate zone, still in 
the case of all three species most closely allied to Australian and New 
Zealand forms, Galiwm gaudichaudii DC., and Spilanthes grandiflora 
Turez. 
This Australasian element can be divided into two categories, the 
first representatives of genera or groups that manifestly have developed 
in Australia, being characteristic of that continent, and that have mi- 
grated northward, and the second those that manifestly have reached their 
greatest development in the northern hemisphere, and that have migrated 
to Australia through Malaya. Manifestly a large part of the flora of 
northeastern Australia is of Malayan origin, and any theory of geographic 
distribution that would account for the presence of these Malayan plants 
in Australia must likewise provide for a migration of Australian types 
northward; the intermigrations between the two floras undoubtedly took | 
place at approximately the same time. The majority of the Australasian 
types mentioned above as occurring on Mount Pulog belong in the 
second category, that is, to groups that have reached their greatest 
development in the north temperate zone, but Microlaena, Schoenus, 
Uncinia, Drimys, Leptospermum, and Halorrhagis, manifestly must be 
referred to the second category. In other parts of the Philippines 
we have other representatives of these strictly Australian types, such 
as Centrolepis philippinensis Merr., Thysanotus chinensis Benth., Asca- 
rina philippinensis C. B. Rob., Patersonia lowti Stapf, Phrygilanthus 
obtusifolius Merr., Acacia confusa Merr., Stackhousia intermedia Bailey, 
Pimelea sp. nov., Didiscus saniculaefolius Merr., Leucopogon suaveolens 
Hook. f., Calogyne pilosa R. Br., Stylidiwm alsinoides R. Br., and Huca- 
lyptus naudiniana F. Muell. 
Somewhat over 100 species are more or less widely distributed in the 
Indo-Malayan region, and generally also of wide distribution in the 
Philippines. Evidences of special alliances between the flora of Mount 
Pulog and that of other parts of Malaya are slight. : So far as our 
collections and observations show, such characteristic families as Palmae, 
Pandanaceae, and Dipterocarpaceae are unrepresented on Mount Pulog, 
yet all of these are strongly developed as regards species in other parts 
of the Philippines and throughout Malaya in general; scores of charac- 
