KEY TO GENERA OF ANADENDREAE AND MONSTEREAE IN WEST AND CENTRAL MALESIA 1. Inflorescence small. Spathe mostly less than 9 cm long just prior to opening . . 2 1a. Inflorescence moderate to large. Spathe mostly more than 9 cm long just prior to opening . . . . . . . . . . . 4 2. Spathe in bud slender, long-slender-pedunculate, conspicuously long-beaked (beak to 1/3 length of entire spathe), opening with inside greenish white and conspicuously glossy-waxy. Flowers with a membranous perigon of fused tepals (i.e. flowers perigoniate).Trichosclereids absent . . . . . . . Anadendrum 2a. Spathe in bud stout, short to long-pedunculate, not conspicuously long-beaked, or if beak present then less than 1/6 length of entire spathe, opening with inside yellow, greenish or glistening white, only moderately waxy. Individual flowers naked (i.e. flowers aperigoniate); trichosclereids present (but sparse in Amydrium). . . 3 3. Trichosclereids abundant (many ‘hairs’ apparent when a mature leaf lamina is torn). Plantterrestrial, rheophytic. Leaf with petiole broadly canaliculate, sheath margins scarious, extending to near apical geniculum, leaf lamina stoutly coriaceous, oblong. Spathe exceptionally thick . . . . . . . Scindapsus 3a. Trichosclereids sparse (very few ‘hairs’ apparent when a mature leaf lamina is torn). Plant climbing or terrestrial and not rheophytic. Leaf with petiole terete, sheath margins not scarious, barely exceeding basal geniculum, leaf lamina rather thin-textured, never oblong. Spathe not exceptionally thick. If plant climbing then leaf lamina variously pinnatifid and perforated . . . . . . . . . Amydrium 4. Trichosclereids sparse (very few ‘hairs’ apparent when a mature leaf lamina is torn). Higher order venation completely reticulate. Ovary 1-locular, placenta 1, intrusive-parietal, ovules 2 . . . . . . . . Amydrium 4a. Trichosclereids abundant (many ‘hairs’ apparent when a mature leaf lamina is torn). Higher order venation striate or reticulate . . . . . . 5 5. Ovules solitary, placentation basal. Fruits with a solitary seed . . Scindapsus 5a. Ovules 2--6 or more, placentation parietal. Fruits with more than one seed . . 6 6. Ovules 8>, superposed on 2 (rarely 3) parietal placentas. Seeds many, ellipsoid,straight, 1.3--3.2 mm long, 0.6--1.0 mm wide; testa brittle, smooth Rhaphidophora 6a. Ovules 2--4 (--6) at base of a single intrusive placenta. Seeds few, curved, 3--7 mm long, 1.5--4.0 mm wide; testa bony and ornamented . . . . Epipremnum