Colocasia oresbia, A.Hay, 1996

Wong, Sin Yeng & Joling, Jyloerica, 2021, Checklist of aroids (Alismatales, Araceae) from Sabah (Malaysian Borneo), Check List 17 (3), pp. 931-974 : 948

Colocasia oresbia A.Hay

Figure 4A

Material examined. MALAYSIA – Pedalaman • Sipi-

tang, Sungai Melabid at lower Eastern slope of Ruan Watgerauo; 04°23′51″N, 115°40′57″E; 1300 m elev.; 17 April 2000; Pius G. et al. SAN 143466 ( SAN) • Tambunan, Gunung Alab; 05°49′53″N, 116°20′24″E; 1600 m elev.; 12 December 1968; Kokawa & Hotta 1934 (L) • Tambunan, Alab, along the road from Agr. Exp. Station to south of Gunung Alab; 05°50′05″N, 116°21′04″E; 1500 m elev.; 11 December 1968; Kokawa & Hotta 1758 (L) – Pantai Barat • Ranau, Mount Kinabalu National Park, along road to summit; 06°4′N, 116°27′E; 2000-3000 m elev.; 27 September 1981; T. B. Croat 53134 ( MO, SAR). Identification. Colocasia oresbia is readily distinguished from wild-type C. esculenta by its non-waxy, wettable leaf blades, rather long stout stem thickly clothed in old leaf bases, lack of stolons, preference for non-saturated sites, much more robust infructescence, straight fruiting peduncle and its brown-tinged green (vs. yellow-orange) fruits ( Hay 1996).

Distribution and ecology. Endemic to Sabah. Western and Southwestern Sabah. Disturbed, mostly rather open sites on banks and road cuttings at ca. 1500 m elev.

Cryptocoryne ciliata (Roxb.) Fisch. ex Wydler Material examined. MALAYSIA – Tawau • Kalabakan , 04°40′N, 117°51′E; 28 July 2008; Ubaldus, Jem- son & Postar SAN 149636 ( SAN) • Lahad Datu, Sungai Gadun ; 05°22′95″N, 118°49′03″E; 17 February 2009; Joel et al. SAN 149691 ( KEP, SAN) .

Identification. The ciliate margin of the spathe limb is diagnostic for this species ( Jacobsen 1985).

Distribution and ecology. This is a first record for the genus Cryptocoryne for Sabah. Mudflats in small or large rivers, ditches, and canals, in tidal areas, in brackish water. The plants often grow in open sun and are mostly covered with a distinct layer of silt.