Figure 3C

Material examined. MALAYSIA – Pedalaman • Tambunan / Keningan District-boundary, Ulu Apin Apin, in colluvial soil, on slope of sanstone ridge, cool shaded habitat; ca. 700 m elev.; i-1993; Lamb & Surat ALFS 625 (holo L).

Identification. Amorphophallus rugosus is morphologically similar to A. costatus but can be differentiated by the much longer peduncle and larger proportions in general (Hetterscheid 1994).

Distribution and ecology. Endemic to Sabah. Known only from the type collection from Ulu Apin Apin, Tambunan-Keningau. Amorphophallus rugosus can be found growing in traditional orchards, rubber farms, secondary and mixed dipterocarp forest. In colluvial soil, on slope of sandstone ridge, cool shaded habitat, ca. 700 m. elev.