KEY TO EPIPREMNUM IN WEST AND CENTRAL MALESIA 1. Leaf lamina pinnatifid . . . . . . . . . 2 1a. Leaf lamina entire . . . . . . . . . . 3 2. Leaf lamina sub-membranaceous, regularly pinnatifid, often with numerous tiny to moderately large perforations. Lamina never variegated . . 6. E. pinnatum (Species picture) 2a. Leaf lamina somewhat coriaceous, irregularly pinnatifid and sometimes partially entire, rarely with tiny perforations. Lamina usually yellow, more rarely white-variegated . . . . . . . . 7. E. pinnatum 'Aureum' 3. Leaf lamina mostly coriaceous. Primary and interprimary venation prominent, indistinguishable from one another, or nearly so (Peninsular Malaysia & Singapore) . . . . . . . . . . 3. E. giganteum 3a. Leaf lamina variously textured. Primary venation markedly more prominent than interprimary venation (Indonesian islands, Borneo) . . . . . 4 4. Leaf lamina elliptic. Spadix conspicuously stipitate (Maluku) . 4. E. moluccanum 4a. Leaf lamina oblong to elongate-oblong to elongate-lanceolate, never elliptic. Spadix sessile or nearly so . . . . . . . . . 5 5. Leaf lamina base acute, oblique (Borneo: Brunei, Sabah & Kalimantan) 2. E. falcifolium 5a. Leaf lamina base subacute to rounded, unequal . . . . . 6 6. Leaf lamina equalling petiole, 18--20 primary lateral veins per side (Maluku) . .. . . . . . . . . . 1. E. ceramense 6a. Leaf lamina longer than petiole, fewer than 15 or more than 30 primary lateral veins per side . . . . . . . . . . 7 7. 35--40 primary lateral veins per side (Sulawesi) . . . . 5. E. nobile 7a. C. 10 primary lateral veins per side (Sumatra). . . . 8. E. silvaticum