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ORCHIDANTHA SARAWAKENSIS SP. NOV. (ZINGIBERALES: LOWIACEAE), A NEW SPECIES ENDEMIC TO EAST MALAYSIA, BORNEO

Lowiaceae is one of the eight families in Zingiberales and comprises a single genus, Orchidantha. This 
genus is restricted to South-East Asia and poorly known among Zingiberales. Currently, there are 25 species 
including a new species from Sarikei, Sarawak, O. sarawakensis Syauqina & Meekiong which is described 
and illustrated in this paper. Orchidantha sarawakensis is compared with species described in South-East 
Asia and also species described in Borneo. The comparison shows that O. sarawakensis is closely related to 
O. megalantha Skornick. & AD Poulsen and O. holttumii K Larsen. The features that delineate O. sarawakensis 
as a new species is that its labellum possesses a prominent extended midrib throughout the apex with spirallike 
structure, curved upwards and a Y-shaped secretion tissue called viscidium. A key of Orchidantha to all 
Malaysian species is presented. 
Keywords: Orchidantha holttumii, O. megalantha, spiral-like, Sarawak