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Yashina et al. (1) reported successful regeneration of whole, fertile plants of Silene stenophylla Ledeb. from immature fruit tissue of Late Pleistocene age using in vitro tissue culture and clonal micropropagation. However, the plants in figures 2–4 in ref. 1 do not possess the diagnostic characters of S. stenophylla. The leaf morphology, inflorescence structure, floral morphology, indumentum, and seed characteristics instead all indicate that the plants belong to the Silene linnaeana Czerepanov (Lychnis sibirica L.) group. These taxa are only distantly related, sharing a most recent common ancestor many million years ago (e.g., 2, 3). Both taxa occur in rubble tundra in the area where the …

The taxonomic identity of the 30,000-y-old plant regenerated from fruit tissue buried in Siberian permafrost