Lowiaceae is one of the eight families in Zingiberales and comprises a single genus, Orchidantha. This genus is restricted to SouthEast 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 SouthEast Asia and also species described in Borneo. The comparison shows that O. sarawakensis is closely related to O. megalantha Škorničk. & 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.
A new species of Amomum Roxb. from Sarawak is described. Amomum bungoensis S. Aimi Syazana & Meekiong, sp. nov., shows similarity with A. durum S. Sakai and Nagamasu by having similar fruit characteristics but differs in labellum and anther crest of the flowers. Detailed description and photographs are provided.
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