Abstract
During a recent survey, Oxygyne specimens were discovered in three lowland evergreen forests on Okinawa Island, Japan. After morphological investigation, we identified the specimens as O. shinzatoi. Intriguingly, the colour of the specimens from one of the localities was significantly different from that of specimens collected from both the type and two of the new localities. Furthermore, morphological analysis also revealed clear differences between specimens collected from the type locality, including the type specimen, and previous descriptions of O. shinzatoi. Therefore, an amended description of O. shinzatoi is provided, based on the type and newly collected specimens. Phylogenetic relationships of Oxygyne from Japan and western Central Africa are also discussed, with consideration of the characteristics of newly discovered colour variation.
Highlights
Oxygyne Schlechter (1906: 140) is a poorly known genus of achlorophyllous, mycoheterotrophic, perennial herbs in Thismiaceae (Cheek et al 2018) or a broadly circumscribed Burmanniaceae in the monocot order Dioscoreales (APGIV, 2016)
During a recent botanical survey, Oxygyne specimens were discovered in three lowland evergreen forests on Okinawa Island, Japan, and morphological investigation identified the specimens as O. shinzatoi (Hatusima 2015: 115)
Morphological analysis revealed clear differences even between specimens collected from the type locality, including the type specimen and previous descriptions of O. shinzatoi
Summary
Thismiaceae), with discussion of phylogenetic relationships of Oxygyne from Japan and Africa. Okinawa Branch Office, IDEA Consultants, Inc., 2-6-19 Aja, Naha, Okinawa 900-0003, Japan. #3, 5-1, Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
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