Home – Home – Jornals – Flora and Vegetation of Asian Russia 2025 number 2

A new species from Dianthus L. genus, endemic from Tyva Republic is described in the article as a new species for science. A detailed diagnosis of the new species is provided, indicating the morphological features of the structure of the root and above-ground shoots. Diagnostic characters have been established that permits reliably distinguish plants of the new species from D. chinensis L. s.l. ( D. versicolor Fisch. ex Link, D. ramosissimus Pall. ex Poir.), in which they were previously considered. Habitually, the plants of new species are short-stem perennial herbs, near 10-12 cm high, developing a taproot, in the above-ground sphere consisting of numerous generative shoots that form a dense turf. Their thin stems do not have spherical extensions at the nodes, develop 3-4 normal internodes, in most cases do not branch, and end in a single terminal flower. Their median leaves in the lower nodes do not wither and are not destroyed by the beginning of flowering, as in D. chinensis group of species; the bend of the petals during flowering has an intense pink color on the adaxial (inner) side and a noticeably lighter, pale pink color on the abaxtal (outer) side. When describing the new species, special attention was paid to the details of the structure and color of the bracts, which are different for the outer and inner pairs, the ratio of their lengths to each other and relative to the calyx tube, the color of the calyx tube and its teeth, which clearly distinguish plants of a new species from D. versicolor . D. tuvinicus habitats in desertified rocky steppes (so named ‘petrophyton’) mainly on fine-grained compacted substrates under conditions of high mineralization of organic matter on slight slopes and plumes in the Central Tyva intermountains.