Systematics of the section Frigidae (Kusn.) Zuev of the genus Dasystephana Adans. (Gentianaceae Juss.) in Siberia

In this paper, Siberian species of the section Frigidae (Kusn.) Zuev of the genus Dasystephana Adans. (Gentianaceae Juss), which are complex from the point of view of systematics (D. algida (Pall.) Borkh., D. glauca (Pall.) Borkh., D. romanzowii (Ledeb. ex Bunge) Rydb., D. vodopjanovae Zuev), were reviewed. Their taxonomic characteristics, ecological features, and habitats were investigated. It was concluded that D. romanzowii (Ledeb. ex Bunge) Rydb., viewed as a variety of D. algida (Pall.) Borkh. by a number of authors, should be considered a separate species. The following aspects were studied: The nature of the color of the corolla. It was established that the color of the corolla, in general, the color of the blades and folds are important; D. algida : the corolla is generally yellowish or yellow, the corolla lobes are green with dark blue spots and dots, the folds of the corolla are yellowish; D. vodopjanovae: the corolla is generally white, the corolla lobes are violet, the folds of the corolla are white, densely dotted with violet streaks; D. romanzowii: the corolla is generally white, the corolla lobes are violet, the folds of the corolla are pure white. The nature of the teeth and the degree of dissection of the calyx: features of the calyx and the teeth are very important in the taxonomy of the genus Dasystephana Adans.; thus, the degree of dissection of the calyx and the character of teeth are the main characteristics separating D. triflora (Pall.) Borkh. and D. pneumonanthe (L.) Zuev; D. decumbens (L.fil.) Zuev and D. dahurica (Fisch.) Zuev; the calyx can be weakly (1/3) or strongly (more than 1/2) dissected, the teeth can be set apart or gathered together; D. algida: the calyx is deeply lobed with teeth gathered together; D. vodopjanovae: the calyx is deeply lobed with teeth gathered together; D. romanzowii: the calyx is shallowly lobed with teeth set apart. Ecology: according to the degree of moisture of the habitats of species, D. romanzowii is the most hygrophilous, D. algida occupies an intermediate position, and D. vodopjanovae is the least hygrophilous species: D. romanzowii: meadows, marshes, peatlands; D. algida: moist tundra and Alpine meadows; D. vodopjanovae: moss-lichen tundra, Alpine meadows, bush thickets, rocky banks of rivers. Habitat: D. romanzowii is found in Arctic regions of Siberia, the Far East, and North America; D. algida is encountered in Europe, southern Siberia, Central Asia, the Far East, and Japan; D. vodopjanovae grows in Transbaikalia (Udokan and Kodar mountain ridges) and the Far East (Dusse-Alin mountain range). In conclusion, the system of Siberian species of the section Frigidae (Kusn.) Zuev is given: Genus Dasystephana Adans. Fam. Pl., 1763;2:503 - Genus Gentiana L., Sp. Pl. 1753;227. Typus: Dasystephana asclepiadea (L.) Borkh. Sect. Frigidae (Kusn.) Zuev, In: Bot. Journ. 1990;75(9):1301. - Sect. Frigidae Kusn. Subgenus Eugentiana Kusnez. the genus Gentiana Tournefort. SPb, 1894;100. Typus: Dasystephana frigida (Haenke) Zuev. Ser. Frigidae (Grossh.) Zuev comb. nova - Genus Gentiana L. Ser. Frigidae Grossh. In: Flora of the USSR. 1952;18:559. Typus: Dasystephana frigida (Haenke) Zuev. 1) D. algida (Pall.) Borkh., In: JJ Roemer, Arch. Bot. 1796;1:26 -Gentiana algida Pall. Fl. Ross. 1788;2:107. Protologue type: "In. summis cacuminibus nivalibus alpium jugis et Sibiriae orientalis, ad Jeniseam, circa Baicalem, in Dauuria et in Camtschatca......copiose crescit, vel nunquam in depressis declivioribus" (LE). 2) D. romanzowii (Ledeb. ex Bunge) Rydb. In: Bull. Torrey Club. 1906;33:148. -Gentiana romanzowii Ledeb. ex Bunge. In: Mem. Soc. Nat. Mosc. 1829;1,7:215. Protologue type: "In terra Tschuktschorum ad sinum St. Laurentii!" (Chamisso ex Eschscholtz) (LE). 3. D. vodopjanovae Zuev. In: Flora of Siberia. Vol. 11: Pyrolaceae-Lamiaceae (Labiatae). 1997;66. Type: Udokan Ridge, upper, right tributary of the Tocco river, bald zone of 1380 m. abs. height, on the rocky banks of the river (NSK). Ser. Glaucae (Grossh.) Zuev comb. nova - Series Glaucae Grossh. In: Flora of the USSR. 1952;18:561. Typus: D. glauca (Pall.) Borkh. 4) D. glauca (Pall.) Borkh. In: JJ Roemer, Arch. Bot. 1796;1:26 - Gentiana glauca Pall. Fl. Ross. 1788;2:209 Protologue type: "Crescit in summis alpibus Camtschatcae, a humido plagam latere septentrionalem spectante, magna copia, cum Ranunculis alpinis" (LE). The article contains 3 Figures and 5 References.

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