New Zealand Journal of Botany
abstracts
Vascular flora of Norfolk
Island: some additions and taxonomic notes
P. J. de Lange1
R. O. Gardner2
W. R. Sykes3
G. M. Crowcroft4
E. K. Cameron2
F. Stalker5
M. L. Christian6
J. E. Braggins2
1Terrestrial
Conservation Unit
Department of
Conservation
Private Bag 68908
Newton
Auckland, New Zealand
pdelange@doc.govt.nz
2Auckland
War Memorial Museum
Private Bag
92018
Auckland, New Zealand
3Landcare
Research
P.O. Box
69
Lincoln 8152, New Zealand
4Natural
Resource Assessors
16 Jesmond
Terrace
Mt Albert
Auckland, New Zealand
5School
of Biological Sciences
University of
Auckland
Private Bag 92019
Auckland, New Zealand
6P.O. Box
60
Norfolk Island
Abstract A
total of 75 taxa (including 1 hybrid) are reported as new to the flora
of the Norfolk Island group, in the south-west Pacific Ocean. Of these
1 is endemic (Achyranthes
margaretarum), and 10 (2
pteridophytes, 8 anthophytes) taxa are considered indigenous and appear
to represent either new natural long-distance colonisations of Norfolk
Island group from Australia and New Zealand or are new identifications
of indigenous taxa either treated under other indigenous names or as
naturalised in the Norfolk Flora. The remaining 64 taxa are considered
naturalisations from resident gardens, or recent arrivals via human
traffic from Australia or New Zealand. Aside from these records we
discuss and update information on a further 27 taxa either covered by
the last Norfolk Island flora treatment, or noted in subsequent works.
A new species, Geranium
gardneri,
is described and treated as
indigenous to Australia and naturalised in Norfolk I. and New Zealand. Nephrolepis
flexuosa is reinstated for the
non-tuberous, high-polyploid fern previously included within a broad
circumscription of N.
cordifolia, and which is
indigenous at least to Norfolk I., Raoul I., Lord Howe I., New Zealand,
and Fiji. The new combination Boehmeria
australis subsp. dealbata
is made for the Raoul I. (Kermadec Islands group) endemic, and Elymus
multiflorus subsp. kingianus
for the Norfolk and Lord Howe Island wheatgrass. The New Zealand Cordyline
kaspar and Raoul I. Rhopalostylis
cheesemanii are relegated to
synonymy within the Norfolk I. Cordyline
obtecta and Rhopalostylis
baueri, respectively, which are
now no longer considered endemic. Dianella
intermedia and Pennantia
endlicheri are treated as
endemic to Norfolk I. and Senecio
australis as indigenous. Two
species, Ipomoea cairica and
Oxalis exilis,
previously treated as
naturalised are recognised as indigenous, while Homalanthus
populifolius is now considered
naturalised and so is excluded from the indigenous flora. A new
treatment for Norfolk I. Oxalis
Sect. Corniculatae
is offered, and three of the
four taxa reported from the island group but treated by the current
flora as part of O.
corniculata sens. lat. are
recognised at species rank. Of these we consider only one, O.
exilis,
to be indigenous, and treat O.
choonodes and O.
radicosa as probably
naturalised. We also report the first naturalised occurrence of O.
corniculata sens. str. from the
island group and exclude O.
perennans from the flora. Isolepis
cernua var. setiformis
is recognised for the Norfolk I. Isolepis
previously treated as probably endemic and unnamed.
Keywords Norfolk
Island group; vascular flora; taxonomy; Geranium;
G. gardneri;
new species; Nephrolepis
flexuosa; reinstated name; Boehmeria;
Boehmeria australis
subsp. dealbata;
Elymus;
Elymus multiflorus
subsp. kingianus;
new combinations; Cordyline;
C. obtecta;
C. kaspar;
Rhopalostylis;
R. baueri;
R. cheesemanii;
synonymy; typification; new records; taxonomic notes; Australian Flora
Series
B04017; Received 10 May 2004;
accepted 7 April 2005; Online publication date 28 June 2005
New Zealand Journal of Botany,
2005, Vol. 43: 563–596
0028–825X/05/4302–0563 © The Royal Society of New Zealand 2005
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