New Zealand Journal of Botany abstracts
A new species of Oreomyrrhis (Apiaceae) from southern South Island, New Zealand, and comparison of its limestone and ultramafic habitats
P. B. Heenan
B. P. J. Molloy
Allan Herbarium
Landcare Research
P.O. Box 69
Lincoln, New Zealand
Abstract Oreomyrrhis basicola is described as a new species from southern New Zealand. O. basicola is segregated from the O. rigida
complex by its grey-green to blue-grey leaves, fewer primary pinnae,
and primary pinnae that are only occasionally further divided with
secondary pinnae. It is known from two base-rich habitats: ultramafic
substrates in northern Southland and limestone in northern Otago. These
substrates have very high base saturations, but differ in that the
exchange complex of limestone substrates is dominated by calcium and
that of the ultramafics is dominated by magnesium. O. basicola
is known from three subpopulations, each with small numbers of plants,
and is, therefore, considered to be Nationally Endangered.
Keywords Apiaceae; Oreomyrrhis; O. basicola; O. rigida; taxonomy; habitats; basicolous; karstland; soil chemistry; conservation; New Zealand flora
B05039; Received 5 September 2005; accepted 21 December 2005; Online publication date 4 April 2006
New Zealand Journal of Botany, 2006, Vol. 44: 99–106
0028–825X/06/4401–0099 © The Royal Society of New Zealand 2006
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