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 Bucephalandra ultramafica S.Y.Wong & P.C.Boyce Figure 3H Material examined. MALAYSIA – Sandakan • Kinabatangan , Telupit , Gunung Tawai ; 05°35′46″N , 117°04′ 37″E ; 18 Dec 2012 ; M. Lo AR-4094 (holo SAN , iso SAR , SBC , SING ) . Identification. Bucephalandra ultramafica is unique by the combination of deeply ridged petioles, narrow deep green glossy leaves, and a bullet-shaped appendix. The leaf blades are somewhat reminiscent of those of B. goliath S.Y.Wong & P.C.Boyce , but B. ultramafica never develops the long pendent stems diagnostic of B. goliath , and the spadix appendix and appendix staminodes are of quite different form ( Wong and Boyce 2014 ). Distribution and ecology. Endemic to Sabah . Known only from the type locality at Gunung Tawai. Restricted to ultramafic (ultrabasic) riverside rocks under lowland moist forest at ca. 130 m elev.