Additions to the vascular flora of Mongolia - IV

The article presents updates on the new species recorded in the “Conspectus of the Vascular Plants of Mongolia” (Urgamal et al. 2014), and three articles published “Additions to the Vascular Flora of Mongolia – I, II, III (2013, 2014, 2016)” listed as new for the Mongolian floristic novelties and reported as well. The aim of this article is to officially report new records for vascular plants from Mongolia, and this includes the data in total, 28 species (with 2 infraspecies) from 19 genera and 12 families. In addition, Cerastium alpinum, Dianthus repens, Draba alpina, Eritrichium tianschanicum, Gastrolychnis violascens, Iris oxypetala, Papaver chakassicum, Papaver lapponicum, Potentilla turczaninowiana, Stellaria depressa (10 species) were newly recorded in the list of vascular flora of Mongolia. The newly added species come under the following families and genera: Caryophyllaceae (5 species), Ranunculaceae (4 species), and Rosaceae (4 species) families and Potentilla (4 species), Geranium (3 species), and Iris (3 species) genera. The most recent additions to the following phyto-geographical regions of Mongolia are: Mongolian Altai (9 species), Khovd (7 species), and Khangai (6 species) regions. At present, 3191 taxa (including 134 subspecies and 34 varieties) of vascular plants, representing over 684 genera from 108 families, 39 orders, 12 classes, includes 5 divisions, and 3 superclades (Ferns, Gymnospermae and Angiospermae) are registered in Mongolia. Since the last conspectus (Urgamal et al. 2014) was published, 1genera, 64 species and subspecies have been newly added to the flora of Mongolia. The newly recorded 5 species are “endemic“and 9 species are “sub-endemic” to Mongolia. Therefore, currently a total of 125 species (3.91%) are “endemic”, and 532 species (16.65%) are “sub-endemic” to the vascular flora of Mongolia, respectively

ALLIUM CAROLINIANUM DC., A NEW SPECIES TO THE OUTER MONGOLIA

The article reports on the new species for the flora of Mongolia Allium carolinianum DC. found in the west part of the country. A short morphological characteristics, nomenclature, the number of chromosomes and description of the karyotype are given

The specific features of the reproductive biology of the rare species

The seed production of the rare species Gueldenstaedtia monophylla has been investigated in 19 coenotic populations in the territories of Russia (Central Altai) and Mongolia (the north-western part). G. monophylla reproduces exclusively by seeds and is characterized by the low number and density of the plants in the populations. Its populations have a high proportion of generative plants: from 31 to 84% from the total number of the plants. The plants of G. monophylla have a small number of generative shoots, varying from 1 to 6 per plant. The number of flowers on the plants is low, too, and varies in the populations on average from 1.2 to 15.3 per plant. The potential seed production (PSP) varies considerably from 13.5 to 308.6 ovules per plant. The real seed production is much lower, to constitute from 6.2 to 74.5 seeds per plant. The low seed production, fructification that occurs not every year, and scanty populations make the species vulnerable