New Zealand Journal of Botany abstracts
Cyperus insularis (Cyperaceae), a new species of sedge from
northern New Zealand
P. B. Heenan
Allan Herbarium
Landcare Research
P.O. Box 69
Lincoln, New Zealand
P. J. de Lange
Terrestrial Conservation Unit
Department of Conservation
P.O. Box 68908
Newton
Auckland, New Zealand
Abstract Cyperus insularis Heenan et de
Lange is described as a new species for plants that have previously
been considered to be a northern variant of C. ustulatus. This
new species is distinguished from C. ustulatus by a suite of
floral and vegetative characters. These include grey-green leaves and
involucral bracts, light pink or light purple-pink leaf sheaths, a
uniformly green culm, the inflorescence rays usually branched, glumes
and ray bracts green at flowering and drying yellow brown to light
brown at fruiting, and longer spikes, anthers, and filaments. The
chromosome number of C. insularis is 2n = 112–114. C.
insularis occurs mainly on northern offshore islands, and appears
to be the only species of Cyperus present on the Kermadec,
Three Kings, Poor Knights, and Mokohinau islands, while it is sympatric
with C. ustulatus on the Hen and Chickens Islands, Great
Barrier Island, and at several mainland locations. A lectotype for C.
ustulatus f. grandispiculosus is selected from the Carse
Herbarium.
Keywords Cyperaceae; Cyperus; C.
insularis; C. ustulatus; C. ustulatus f. grandispiculosus;
taxonomy; chromosome number; New Zealand flora
B04031; Received 30 July 2004; accepted 10 November 2004; Online
publication date 7 April 2005
New Zealand Journal of Botany, 2005, Vol. 43: 351–359
0028–825X/05/4301–0351 © The Royal Society of New Zealand 2005
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