Saturday, June 23, 2018

[Botany • 2017] Fimbristylis fusiformis (Cyperaceae) • Taxonomy and Phylogenetic Position of A New Species from Thailand

Fimbristylis fusiformis Wangwasit & D.A.Simpson

in Wangwasit, Muasya, Chantaranothai & Simpson, 2017.

Fimbristylis fusiformis, an unusual new species of Cyperaceae from Thailand, is described and illustrated. This taxon has a single terminal spikelet per culm with a semi-distichous glume arrangement, bisexual flowers that lack perianth parts, and pistil with persistent style whose base is slightly swollen and trigonous nutlets with pubescent ribs. Phylogenetic reconstruction using ITS sequence data places this taxon in Abildgaardieae and sister to the rest of Fimbristylis. The species has a conservation status of Least Concern (LC).

Keywords: Conservation Status; Fimbristylis; Phylogeny; Taxonomy

Fig. 2 Fimbristylis fusiformis Wangwasit & D.A.Simpson.
a. Plants in habitat; b. close-up of spikelet. — Photos by D.A. Simpson.

Fimbristylis fusiformis Wangwasit & D.A.Simpson, sp. nov.

Superficially similar to F. pauciflora R.Br. but distinguished by the glumes 6.5–8.5 mm long (vs 2.5–3 mm long in F. pauciflora), nutlets fusiform, fimbriate at apex and base, with 3 longitudinal costae (vs nutlets obovate and glabrous in F. pauciflora). — Type: K. Wangwasit 080927-17 (holo K; iso BK, KKU), Thailand, Ubon Ratchathani, Pha Taem National Park, 27 Sept. 2008.

Etymology. Named after the shape of the nutlets.

 K. Wangwasit, A.M. Muasya, P. Chantaranothai and D.A. Simpson. 2017. Taxonomy and Phylogenetic Position of Fimbristylis fusiformis, A New Species of Cyperaceae from Thailand.  Blumea - Biodiversity, Evolution and Biogeography of Plants. 62(1); 47-52.  DOI: 10.3767/000651917X695209

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