The Republic of Bashkortostan is located between 51°34′ –56 °10′ N and 53°10′ — 59°59′ E, its length from the north to the south — 550 km, from the west to the east — 450 km. The territory of Bashkortostan consists of three main natural regions (provinces): the Bashkir Cis-Urals (about 65 % of the area), the South Urals (29 %) and the Bashkir Trans-Urals (6 %). These areas differ not only by the natural conditions (topography, climate, soil, vegetation, etc.), but also by their level of economic development.
Currently, an expansion and naturalization of a number of North American alien species of the family Asteraceae Dumort. of the genera Ambrosia L., Xanthium L., Bidens L., Galinsoga Ruiz & Pav., Cyclachaena Fresen. etc. (Abramova, 2011, 2012, 2014, 2015) are observed in the Republic of Bashkortostan. Since 1990th of XX century we conduct a geobotanical research of communities with alien species.
The article represents the third part of series of publications devoted to the classification of communities with alien species in the South Urals. The results of vegetation classification of communities with species from the genera Ambrosia L., Cyclachaena (Nutt.) Fresen and Xanthium L. were published earlier (Abramova, 2011, 2015). In this article the communities with participation of three aggressive alien species such as: Bidens frondosa L., Hordeum jubatum L. and Urtica cannabina L. are presented. Two of them— Bidens frondosa and Hordeum jubatum — are included in “The black book of flora of the Central Russia” (Vinogradova, et al., 2010), and they are invasive species of many regions of Russia, and the third – Urtica cannabina — an invasive species of the South Urals (Abramova, 2014). As a result of the carried-out classification a Prodrome of communities is made, the synoptic table of syntaxa is given.
Some Features of the Biology and Ecology of the Invasive Species Hordeum jubatum L. (Poaceae, Liliopsida) in the Southern Ural
