Acta Phytotaxonomica et Geobotanica
Online ISSN : 2189-7042
Print ISSN : 1346-7565
Myxochlamys (Zingiberaceae), a new genus from Borneo
ATSUKO TAKANOHIDETOSHI NAGAMASU
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2007 Volume 58 Issue 1 Pages 19-32

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Abstract

A new genus and species, Myxochlamys mullerensis (Zingiberaceae) from Central Kalimantan, Borneo is described. This new species is characterized by indistinct pseudostems; congested inflorescences with spirally arranged bracts; copious, highly viscous, axillary-pooled mucus secreted from glands on imbricate bracts; and flowers with a concave labellum, versatile anthers, and a groove formed by the inner surface of the corolla tube to envelope and hold the style. Parallel orientation of the plane of distichy of the leafy shoots, well-developed staminodes, and labellum not connate with the filament suggest that Myxochlamys belongs to the tribe Zingibereae. Among the genera in Zingibereae, Myxochlamys is similar to Scaphochlamys in that it lacks a distinct pseudostem and spiral inflorescence; it is distinct from Scaphochlamys, however, in that it has a groove within the corolla tube, concave labellum and versatile anthers. Phylogenetic analyses based on DNA sequences of the nuclear internal transcribed spacer (ITS) and maturase K (matK) of the chloroplast DNA show similarity with Distichochlamys, Myxochlamys, and Scaphochlamys. The similarities and differences between Myxochlamys and related genera are discussed.

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© 2007 The Japanese Society for Plant Systematics
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