Sahnioxylon is a form-genus used for fossil woods. Because of its primitive features, it is at the base of the Anthophytes. Ranging from the Triassic to the Cretaceous and from Siberia to the Antarctica, Sahnioxylon seems to be of little palaeobiogeographical interest. This may be because of a taxonomic artefact. Indeed, Sahnioxylon is presently based on primitive features. A review of this genus follows, based on features commonly accepted as evolved. These do not allow any certainty about the botanical relationships of the genus, but are enough to assert its unity. The results of this review evoke several questions about biostratigraphy and palaeobiogeography, particularly that of continental taxa exchanges through eastern Tethys during the Mesozoic.

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