Alocasia sarawakensis M.Hotta

Wong, Sin Yeng & Joling, Jyloerica, 2021, Checklist of aroids (Alismatales, Araceae) from Sabah (Malaysian Borneo), Check List 17 (3), pp. 931-974 : 942

Alocasia sarawakensis M.Hotta

Figure 2G

Material examined. MALAYSIA – Pedalaman • Beluran, Ulu Tungud Forest Reserve, Sungai Keberibi ; 05°51′28″N, 116°58′37″E; 411 m elev.; 23 Juy 2005; Joanes U., Julia S., Pius G., Kuntil L., Entol M. & Ajirin M. SAN 146894 ( SAN) • Tambunan, Kampung Tondulu, Road to Kampung Tondulu , 05°41′06″N, 116°20′08″E; 670 m elev.; 16 October 1999; P. C. Boyce & J. Linton, P. C. Boyce 1413 ( SNP) – Sandakan • Kinabatangan Besar, Korin Timber Camp ; 28 October 1948; Cuadra A. 2144 ( SAN) – Tawau • Lahad Datu, Danum Valley Conservation area, Mount Tribulation ; 04°50′17″N, 117°39′51″E; 387 m elev.; 26 August 2016; Sugau J. B., Jeisin, M. & Postar, M. SAN 158179 ( SAN) • Lahad Datu, Tabin Wildlife Reserve , Wildlife Department’s Headquarter, West

to Lipad Mud Volcano ; 05°11′″N, 118°30′E; 150 m elev.; 23 February 2000; Kjeldsen K.H. Kjeldsen 30 ( AAU, SAN) • same locality; 150 m elev.; 8 March 2000; Kjeldsen K.H. Kjeldsen 85 ( AAU, BORH, KEP, SAN) • Semporna , Mapat R., Timbun Mata Forest Reserve; 3.6576 m (12 ft.) elev.; 8 August 1937; Keith A 7419 ( SAN) • Tawau , Mount Lucia , Expidisi Mount Lucia, Morutai River, along stream; 04°28′11″N, 117°56′22″E; 720 m elev.; 6 July 2005; Yabainus J. SP 10774 ( SNP) .

Identification. Alocasia sarawakensis is easily distinguished from A. robusta and A. macrorrhizos , which sometimes all occur together and resemble each other in the very large broad leaves and preference for open habitats, by the very prominent venation on the abaxial side of the leaf blade, forming well defined interprimary col- lective veins. It can be distinguished further from A. robusta by having the posterior costae naked in the sinus and the abaxial side of the leaf blade pubescent and not glaucous ( Hay 1998).

Distribution and ecology. Widespread. Common in open swampy places; often seen in roadside ditches; encountered in swampy places in forest as a hairy juvenile; from sea level to ca. 1200 m elev.