New Zealand Journal of Botany abstract
B97077Received 23 October 1997; accepted 13 March 1998
Senecio repangae (Asteraceae): a new endemic species from the
north-eastern North Island, New Zealand
P. J. DE LANGE
Science & Research Unit
Department of Conservation
Private Bag 68908
Newton
Auckland, New Zealand
B. G. MURRAY
School of Biological Sciences
The University of Auckland
Private Bag 92019
Auckland, New Zealand
Abstract A new species
Senecio repangae is described
from the north-eastern North Island, New Zealand, where it grows primarily on
offshore islands. It has previously been included within the widespread New
Zealand endemic
Senecio lautus, from which it is distinguished by its
much taller, sparingly branched habit, longer and narrower capitula, much
shorter, widely and unevenly spaced, recurved, incised ray florets, and by its
chromosome number (2
n = 100). A new subspecies,
S. repangae
subsp.
pokohinuensis, endemic to the remote Mokohinau Islands group is
also recognised. This allopatric taxon is distinguished from
S.
repangae subsp.
repangae by its sparsely hairy, glabrescent,
glaucous, adaxial leaf surface, smaller involucral bracts, and evenly spaced,
longer, ray florets which are never recurved. The distribution, ecology,
cytology, reproductive biology, conservation, and relationships of both
subspecies to other New Zealand
Senecio species are assessed.
Keywords Senecio; S. lautus complex; new
species; S. repangae; new subspecies; S. repangae subsp.
pokohinuensis; taxonomy; chromosome numbers; conservation; New Zealand
flora
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