Checklist of aroids (Alismatales, Araceae) from Sabah (Malaysian Borneo) Author Wong, Sin Yeng Author Joling, Jyloerica text Check List 2021 2021-06-17 17 3 931 974 http://dx.doi.org/10.15560/17.3.931 journal article 10.15560/17.3.931 1809-127X Amorphophallus rugosus Hett. & A.L.Lamb 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.