Atraphaxis kuvaevii Yurtseva & Vasilieva & Kostikova & Samigullin 2022, sp. nov
| Autor: | Yurtseva, Olga V., Vasilieva, Natalia V., Kostikova, Vera A., Samigullin, Tahir H. |
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| Rok vydání: | 2022 |
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| DOI: | 10.5281/zenodo.7108147 |
| Popis: | Atraphaxis kuvaevii sp. nov. Atraphaxis kuvaevii, a local endemic of Tuva, forms a separate subclade in both plastid and ITS trees and does not show introgression with other species (Figs 1 and 3). It is a dwarf schrub 10–25 cm in height, with divaricately branched second-year shoots and annual generative and vegetative shoots 2–5 cm long (Fig. 4, Table 1). Leaves are small, rhomboid (Fig. 5A). Generative shoots terminate with thyrses with 3–5 cymes of 1–2 flowers. The perianth is small, with a tube articulated to a pedicel in ochreola (Fig. 5B, C). The epidermal cells covering the perianth tube and the tepals do not differ from those of A. pungens and A. ledebourii (Fig. 6A–F). Fruits are smooth and glossy, light brown, with three styles terminated with globular stigmas (Fig. 5D–F, Fig. 6G–I). Atraphaxis kuvaevii has tricolporate pollen grains 27.4–27.7 × 14.5–15.9 µm with striate-perforate sporoderm ornamentation: it has short grooves and 2–3 perforations in a row (Fig. 7A–B), while the pollen surface of A. pungens (Fig. 7C) and A. decipiens (Fig. 7D–E) has distinct striae and long grooves with 5–6 perforations in a row. Atraphaxis kuvaevii clearly differs from other species of Atraphaxis with the smallest leaf blades, perianth, and the tepals cuneate at the base, the filiform perianth tube articulated to the pedicel in ochreolae, and the smallest fruits (Table 1). Atraphaxis kuvaevii was previously mistaken for A. laetevirens distributed in Kazakhstan, Altai and Dzhungaria. Both species have small glands at the edges and on the lower surface of leaf blades, and light-brown glossy fruits, but the fruits of A. kuvaevii are equal to the inner tepals, while the fruits of A. laetevirens are 2–3 times smaller than the inner tepals of the perianth. Atraphaxis laetevirens falls different subclades in both plastid and ITS trees. Thus, the morphological and molecular data support A. kuvaevii as a distinct species distributed in Tuva and the South of Krasnoyarskii Krai (Fig. 8). RUSSIA. Krasnoyarskii Krai: the West Sayan, Sayano-Shushensky Nature Reserve, left board of the Sayano-Shushenskii water reservoir, above the Kalbakmys river, stony mountain steppe, 615 m, 3 July 1987, Kuvaev & Sonnikova 1015-13 (holotype MW0061320) Published as part of Yurtseva, Olga V., Vasilieva, Natalia V., Kostikova, Vera A. & Samigullin, Tahir H., 2022, A broadly sampled 3 - loci plastid phylogeny of Atraphaxis (Polygoneae, Polygonoideae, Polygonaceae) reveals new taxa: III. A. kuvaevii and сryptic species in A. pungens from Southern Siberia and Northern Mongolia, pp. 13-63 in Phytotaxa 566 (1) on pages 21-22, DOI: 10.11646/phytotaxa.566.1.2, http://zenodo.org/record/7103418 |
| Databáze: | OpenAIRE |
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