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Abstract
Pachycladon fasciarium is described as a new species from the Chalk Range, Mead Hill, and Ben More in eastern Marlborough, New Zealand. It is an obligate caldcole, occurring only on Amuri Limestone at an altitudinal range of 900–1170m. This new species is most similar to P. fastigiatum, from which it is distinguished by glabrous, narrowly linear, shorter, usually entire leaves, with a length‐to‐width ratio of 7.4–18.4:1 (av. 11.3:1). In contrast, the leaves of P. fastigiatum are either glabrous or hairy, elliptic to lanceolate, prominently serrated, and with a length‐to‐width ratio of 3.2–8.8:1 (av. 5.2:1 ). In a principal components analysis of six leaf morphological characters, plants of P. fasciarium form a group that is distinct from a second group that includes plants of P. fastigiatum sampled from throughout its distributional range. Pachycladon fasciarium is currently known from fewer than 50 plants, and its conservation status is assessed as Nationally Critical.
