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The generic placement of the enigmatic and extinct  Logania depressa  from New Zealand has been uncertain due to the paucity of available plant material. This diminutive plant has only been collected once from the central North Island, New Zealand, by William Colenso on 22 February 1847.  Logania depressa  is dioecious and the single collection comprises only male flowers and does not include female flowers or fruit that feature generic diagnostic characters. Previously its relationship to  Geniostoma  has been considered and its affinities to  Orianthera  are unknown.  Orianthera  has been recently recognised as a segregate of  Logania . Using leaf material from a small fragment of  L. depressa  held in Allan Herbarium (CHR) we recovered 9,368 bp of plastid sequence data that mapped to  Mitreola yangchuensis , with  Mitreola  being the closest generic relative of  Logania  for which whole genome data was available. Available genetic data for Loganiaceae is limited to several chloroplast markers, including the  rps 16 intron,  pet D intron, and  pet D– pet B intergenic spacer. From the novel plastid sequence data for  Logania depressa , 48 bp of the  rps 16 intron, 45 bp of the  pet D intron and 49 bp of the  pet D– pet B intergenic spacer could be recovered to compare with available Loganiaceae sequences. Phylogenetic analysis of these sequences confirmed  L. depressa  as the only New Zealand member of  Logania  sens. str., but its relationships to Australian species are unresolved.

Plastid DNA sequence data of the extinct Logania depressa (Loganiaceae) from New Zealand confirm its generic placement