A taxonomic revision is presented of the genera Discocalyx Mez, Fittingia Mez, Loheria Merr., and Tapeinosperma Hook.f. in New Guinea and partly in the adjacent islands, mainly in the Moluccas and in the Solomon Islands, with keys to the species, detailed descriptions of all taxa, and an enumeration of the collections studied. A key to all genera of the Myrsinaceae occurring in Eastern Malesia is added.

A taxonomic revision of the genus Conandrium Mez, which is reduced to 2 species, one in the Moluccas and in the extreme West of New Guinea, the other widely distributed all over New Guinea and the Bismarck Archipelago, and apparently also represented in the Aru Islands. A key to the species, complete descriptions and an enumeration of the collections studied are given.

A taxonomic revision of the genus Ardisia Sw. in New Guinea, the Moluccas and the Aru Is. (but excluding the Bismarck Archipelago and the Solomon Is.), comprising 7 subgenera with a total of 31 species, of which 3 species are new to science. A key to the subgenera and keys to the species, full descriptions of all species, and an enumeration of the collections studied are given.

A taxonomic revision of the genus Maesa Forsk. in New Guinea and the adjacent areas (mainly Moluccas and Solomon Islands), comprising 26 species, of which 9 are new to science. A key to the species, full descriptions of all taxa, and an enumeration of the collections studied are given.

A taxonomic revision of the genera Embelia Burm. f. and Grenacheria Mez in New Guinea incl. the Solomon Islands, comprising 12 species, of which 5 are new to science. A key to the species, full descriptions of all taxa, and an enumeration of the collections are given.

A taxonomic revision of the genus Rapanea Aubl. in New Guinea, and partly in the adjacent areas (mainly the Moluccas and the Solomon Islands), comprising 22 species, 5 of which are new to science. A key to the species, full descriptions of all taxa, and an enumeration of the collections studied are given.

A revision of the Flacourtiaceae known from Thailand, comprising 11 genera and a total of 40 species, 2 of which in Homalium, and 1 in Casearia are new to science. Keys to genera and species, full descriptions of all taxa, and an enumeration of the collections concerned are given.

In the present work details are given in the first place for the Malesian Olacaceae, representing the basis of my forthcoming treatment of the family in ‘Flora Malesiana’, in which full descriptions of the Malesian genera and species will be given. As the Olacaceae of Malesia are connected with those of South and Southeast Asia on the one, and those of Australia and the Pacific on the other side, it has been necessary to study the respective materials too. A part of the Malesian genera is represented also in Africa inch Madagascar, and even in Central and South America; the appertaining species have been studied but are not mentioned in this paper. A critical elaboration of the family for Africa and America is urgently needed, but will, as far as can be seen, be of no influence of the delimitation and scientific names of the Asiatic-Malesian Olacaceae.

Complementary notes on the taxonomy, distribution, and hybridization of a number of Rhododendron species in Malesia on the base of recent collections, and descriptions of 10 species new for the genus in Borneo and New Guinea.

A taxonomic revision of Scolopia, based on the collections most important for the genus. Of the names of the about 80 taxa previously described in the genus, 28 remained valid; for 2 species and 1 variety a new combination had to be made, 7 new species and 1 new variety were added, and 5 species had to be transferred to other genera. This resulted in a total of 37 species (and 2 varieties); of these, 21 species are found in Africa (15 of them in Madagascar, the Comores, and the Mascarenes), 15 in Southeast Asia and Malesia (incl. New Ireland), and 1 in Australia.

In the present work details are given in the first place for the Malesian Icacinaceae, representing the basis of my forthcoming treatment of the family in ‘Flora Malesiana’ in which full descriptions of the Malesian genera and species will be given. Being connected closely with the Icacinaceae of South and Southeast Asia on the one, and with Australia and the Pacific on the other side, and in part even with those of Africa inch Madagascar, it has been necessary to study the respective materials too, without, however, to perform a complete revision of all Icacinaceae in these parts of the world. This was the less necessary, as R. A. Howard (1940—42) already has revised part of the genera concerned. The elaboration of the family in several local treatments has much contributed to our knowledge of the family for Africa. Of the genera formerly included in Asiatic-Malesian Icacinaceae Leucocorema Ridl. has been transferred to Trichadenia Thwait., Matpania Gagnep. to Bouea Meisn., and Petitastira Ridl. to Dichapetalum Thou.

The species numbers refer to those given in the author’s previous revisions, cited at the genus. An a, b, or c number indicates the relationship of a new species.

Within the genus Vaccinium L. this revision of its Malaysian species — which comprises more than half of the total number of species of the genus — is the last in a series of modern treatments made for North America by W. H. Camp, for the Pacific area by C. Skottsberg, and for tropical America and tropical Asia by the present author. The work formerly done in Malaysian Vaccinium has been limited to islands, as that by J. J. Smith and Schlechter for a part of New Guinea, by Copeland f. for the Philippines, and by Amshoff for Java, with the shortcomings necessarily connected with such too local work. The sections proposed for the Malaysian species in my general system in 1941 have been found still useful and are kept here except a nomenclatural change in one section and the expansion in species due to the large amount of indetermined material collected in Celebes and especially in New Guinea.

During a recent treatment of the Proteaceae for “Flora Malesiana” it has become evident that a revision of the generic status of all proteaceous taxa reported from S. Asia and Malaysia as well as from the adjacent regions of Micronesia, Melanesia, Polynesia and subtropical-tropical Australia had to be made to reach a satisfactory correlation of the genera and species concerned as a basis for the discussion of phytogeographical relations both within and outside the proper Malaysian area. During this work it appeared necessary to transfer some species to other genera. A revision of the genus Helicia showed that a group of species had to be segregated as a distinct new genus Heliciopsis. My studies are based on herbarium specimens borrowed from the following Institutions: Arnold Arboretum (A), Bot. Mus. Berlin-Dahlem (B, where the type-material of the family remained intact), Bogor (BO), Brisbane (BRI), Calcutta (CAL), Edinburgh (E), Florence (FT), Kepong (KEP), Lae (LAE), Leiden (L), Melbourne (MEL), Miinchen (M), New York (NY), Manila (PNH), Singapore (SING), Stockholm (S) and Utrecht (IT). The material preserved in the British Museum (BM), at Kew (K), and Paris (P) has been studied during a stay at London and Paris.

Casearia amplectens Sleum. sp. nov. — Arbuscula 1.5 m alta; ramulornm apicibus dense breviter flavido-pilosis, partibus vetustioribus cito glabratis corticeque cinerascenti obtectis. Folia elliptico-oblonga vel oblonga, apicem versus breviter (1—2 cm) subcaudato-acuminata, apice ipso paullo falcato obtusa, basi late cuneata fere rotundata, inferiora usque ad 2 mm longe petiolata, superiora subsessilia, membranacea, arcte pellucido-punctata et -lineata, petiolo, costa nervisque subtus brevissime pilosulis exceptis glabra, in sicco brunnescentia, utrinque opaca, regulariter crenato-serrata (dentibus obtusiusculis glandula terminatis 1 mm altis et c. 3—6 mm distantibus), 9—15 cm longa, 4—4.5 cm lata, costa utrinque elevata, nervis lateralibus utroque latere 6—8 curvato-ascendentibus praeter marginem excurrentibus supra subimpressis, subtus elevatis, venis supra obscuris, subtus parum conspicuis. Stipulae reniformes fere amplectentes, membranaceae, 4—6 mm altae, 6—8 mm latae, persistentes. Flores pro axilla. 1—2 fere sessiles, in statu nondum plane evoluto tantum visi; bracteae paucae membranaceae glabrae 1—2 mm longae. Calyx tubulosus, carnosulus, c. 3 mm longus, extus fulvo-sericeus, intus glaber, lobis oblongis c. 1 mm longis. Stamina 10, alte ad faucem inserta; filamenta glabra, medio dilatata, alternatim 0.6 et 0.3 mm longa. Staminodia rudimentaria parum pilosa. Ovarium columnare, glabrum, c. 3 mm longum, 1 mm crassum. Fructus carnosus, ruber, 1.5—2 cm longus, 1 cm diam., trivalvis, basi calycis lobis accrescentibus 4 mm longis et 1.5 mm latis fultus, 2 mm longe pedunculatus. NEW GUINEA. W. New Guinea, 4 km SW of Bernhard Camp, Idenburg Riv., rain-forest undergrowth, 850 m: L. J. Brass 13470 (A; L, typus), fl. fr. March 1939.