Monday, April 24, 2017

[Botany • 2017] Etlingera frederikii • A New Species of Etlingera (Zingiberaceae) from Bougainville Island, Papua New Guinea


Etlingera frederikii A.D.Poulsen

Abstract
A new species, Etlingera frederikii, is described and illustrated, and is the first record of the genus in the Bougainville Region. Etlingera frederikii and E. cevuga, which occurs in Fiji and Samoa, are the two most easterly species in the distribution range of the genus. The new species differs from Etlingera cevuga in its much larger leaves, with a conspicuously silky-haired band on the ligule; the smaller, narrowly ovoid to cylindrical inflorescence with pale brown bracts (not hemiglobose with reddish brown bracts); and fewer, smaller flowers.

Fig. 1. Photographs of Etlingera frederikiiA, Clump of leafy shoots; B, leafy shoot with two ligules (white triangles indicating sericeous bands) and leaf bases; C, inflorescence in situ; D, inflorescence excavated; E, fertile bract; F, bracteole; G, calyx; H, flower, lateral view (calyx removed).
A and B, Poulsen et al. 2880, made in Lae Botanic Gardens; C–H, the type, Poulsen et al. 2593. Photographs by A. D. Poulsen.  DOI: 10.1017/S0960428617000026    

Etlingera frederikii A.D.Poulsen, sp. nov. 

Etymology. Named in honour of H.R.H. Frederik, Crown Prince of Denmark, who was the patron of the Danish Expedition Fund that planned and executed the Galathea 3 circumnavigation during which this new species was discovered. The Crown Prince has himself participated in expeditions to Central China and Northeast Greenland and has also supported an expedition to Borneo in 2002 led by the first author. 

Distribution. Bougainville Island. So far, documented only from the type locality in ridge forest at 850 m. It is likely to occur naturally on the neighbouring island to the south-east, Choiseul, in the Solomon Islands. A cultivated plant with a dried-up inflorescence in a garden in Buka Town, Buka Island (just north of Bougainville Island) is very likely of the same species.

Vernacular name. Rurutate (Rotokas language). Uses not known. 

Etlingera frederikii A.D.Poulsen

 A. D. Poulsen and B. B. Bau. 2017. A New Species of Etlingera (Zingiberaceae) from Bougainville Island, Papua New Guinea.  Edinburgh Journal of Botany. DOI: 10.1017/S0960428617000026


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