Chromosome numbers for some vascular plants from Mongolia. Post 3

Abstract

Chromosome numbers (2n) for 18 rare, endemic plant species (21 populations) from the families Asteraceae, Brassicaceae, Boraginaceae, Ephedraceae, Euphorbiaceae, Fabaceae, Poaceae, Scrophulariaceae are reported on the material from Mongolia. For Hackelia tymifolia (DC.) Johnston (2n = 24), Lappula intermedia (Ledeb.) Popov (2n = 24), Oxytropis saposhnikovii Krylov (2n = 16), Pachyneurum grandiflorum (C. A. Mey.) Bunge (2n = 18), Psammochloa villosa (Trin.) Bor (2n = 28), chromosome complements were examined for the first time. For the species of Erigeron lonchophyllus Hook., 2n = 18 was determined from Asia for the first time. Chromosome numbers of Alyssum desertorum Stapf (2n = 32), Astherothamnus heteropappoides Novopokr. (2n = 18), Heteropappus altaicus (Willd.) Novopokr. (2n = 36; 36 + 0-2B), Ephedra monosperma C. A. Mey. (2n = 14), , Lactuca tatarica (L.) C. A. Mey. (2n = 18), Lappula anisacantha (Turcz. ex Bunge) Gürke (2n = 24), Senecio ambraceus Turcz. (2n = 40) were determined from Mongolia for the first time. New cytotypes for Euphorbia tshuiensis (Prokh.) Serg. ex Krylov (2n = 4x= 38–40) and Oxytropis oligantha Bunge (2n = 3x = 24) were studied. For the species, the area and published data on karyology are given.