Typha shuttleworthii W.D.J. Koch et Sond. relates to species of typical section of genus Typha L. (Typhaceae Juss.) [1] [2] . The modern areal of species embraces the ocean districts of Europe and includes the countries of the Medium and Central Europe and Mediterranean, quasi―the countries of Eastern Europe [2] [3] . Almost everywhere species is considered rare. It is extinct in Hungary, included in the Red Data Books or Red Lists in many European countries: Slovakia, Liechtenstein, Germany, Switzerland, Austria, Greece, Bulgaria, Czech Republic, Serbia [3] -[8] . This species was recently marked in Poland, where it is considered as a vulnerable plant species [8] . At the same time, in European Red List of Vascular Plants needed protection, it is marked as a species for which there is no sufficient information (“Data Deficient”) [9] . The species is known also from Belarus [10] ; it is given to Ukrainian steppe flora [11] . In Russia T. shuttleworthii is considered sufficiently common species in some Western regions and is known from Moscow and Kaluga regions, from Krasnodar Territory, Crimea and some areas of Ciscaucasia [11] -[13] . The extreme eastern populations in area of T. shuttleworthii are known from the territory of Vyatka-Kama Cis-Urals (VKCU) within the Republic of Udmurtia and Tatarstan, where the growing of this cattail for the first time was marked by us in 2006 [14] [15] . Afterwards a small population of the species was found in the city Izhevsk [16] . In connection with the feature of distribution of T. shuttleworthii and its rarity, it is interesting to study some biological and ecological characteristics of plants of this species growing on the border of the area.

Two of three populations of T. shuttleworthii, known at present on the territory VKCU were studied (Figure 1). One of them (№1) is located 5 km south from village Muvazhi, Alnashsky district, Udmurt Republic (~56˚01'N, 52˚42'E) and occupies the coastal shallow water of a small pond on the river Golyushurminka. The population is composed of two plots an area of 105 m² and 70 m² spaced at right angle, repeating the shape of the coastline.

Second population (№2) is located in the city of Izhevsk in the neighborhood of the Botanical Garden of Udmurt State University (~56˚55'N, 53˚15'E) and being on the damp bottom of the drainage channel.

On sample plots within populations the species composition of vascular plants was identified, general projective cover and projective cover of the marked species on the Braun-Blanquet cover-abundance scale were reported. On the living plants the morphological parameters were measured having diagnostic value. The aboveground biomass of plants was studied in 2008 by the example of population №1. The population №2 at the time of research was strongly rarefied, therefore in order to preserve it was not used for the study of biomass. Crude, air-dry and absolutely-dry biomass was measured to the nearest 0.01 g on the technical scales “ВЛКТ-500”. To air-dry state the plant was adjusted in the open air on the shaded conditions, and then was ground and dried to absolutely-dry state at the temperature of 105˚C.

Within the main area T. shuttleworthii ecotopic connected with natural and artificial watered habitats. On the territory of the VKCU species is found in secondary habitats represented shallows of artificial reservoirs (small ponds) and the bottom of the drainage channels. The communities with dominance of T. shuttleworthii were low taxonomic diversity (Table 1). General projective cover was varied between 50% - 100%, the cover-abundance of T. shuttleworthii within phytocenoses changed from 2 to 4 on a scale of Braun-Blanquet, the ratio of the number of generative to vegetative shoots was 2:3.

Crude aboveground biomass of cattail at the end of July 2008 in the population №1 was on average 4.85 kg/m², air-dry―1.96 kg/m², absolutely-dry―1.90 kg/m².

The results of the study of morphometric parameters of the population №1 are presented in Table 2. According to obtained data, the plants of this species in the territory of the VKCU have reproductive shoots 1.07 - 1.62 m height with 7 - 8 light-green leaves. The leaves usually are somewhat longer than the flowering shoots. The width of the leaves varies widely, however, leaves of the reproductive shoots are somewhat narrower. The fe- male inflorescence is cylindrical, in the flowering period it is green or dark-green, during the fructification

Descriptions: 1, 2, 3―Udmurt Republic, Alnashsky district, 5 km south from village Muvazhi, the coastal shallow water of a pond on the river Golyushurminka, 13.VII.2008, G.R. Platunova; 4―Udmurt Republic, Izhevsk, the neighborhood of the Botanical Garden of Udmurt State University, the damp bottom of the drainage channel, 25.VII.2010, O.A. Kapitonova.

phases―brown with a slightly whitish tinge due to the long hairs of perianth protruding from the stigmas. The latter feature is particularly clearly pronounced in the lower part of the female inflorescence (Figure 2). The gap between female and male inflorescences is absent; the ratio of female inflorescences to male varies from 2.05 to 3.63, an average of 2.36.

According to the received materials, the morphometric characteristics of the plants of the studied population in general are consistent with literature data. However, we have noticed that some of the plants in the population had larger sizes that it was reflected in the value of some parameters. For example, the average values of the width of the leaf blade and the length of female inflorescence in the studied population were a bit larger than those values, which are given for this species in the literature [2] [3] [7] [8] . It suggests the genetic heterogeneity of the studied population. Perhaps we are not dealing with one species and with a set of populations of T. shuttleworthii and hybrid plants generated by crossing T. shuttleworthii with closely related species (for example, Typha latifolia L.) in the contact zone of their areas. To a certain extent it is confirmed by our recent finding of a very rare hybrid Typha × argoviensis Hausskn. ex Asch. et Graebn. (T. latifolia × T. shuttleworthii) on the territory of Izhevsk [17] . The correctness of this assumption will test subsequent more detailed studies using cytological and molecular genetic methods.

Our research allows us to recognize the low competitive potential of populations of T. shuttleworthii, located at the eastern limit of distribution in general. This feature does not allow this species populate primary ecotopes where the ecological niches are already occupied by the structural and functional analogs. The possibilities to populate the secondary ecotopes are also limited, because it superseded from there by stronger competitors, primarily, T. latifolia. Contemporary large-scale anthropogenic transformation of landscapes is threatened by the destruction, transformation and pollution of habitats T. shuttleworthii, the consequence of which could be the disappearance of populations of this species or their genetic assimilation with a closely related species.

T. shuttleworthii―one of the plant species which requires protection on the territory of the VKCU, is a vulnerable species. It cannot compete with other semi-aquatic plants. Anthropogenic changes of the aquatic landscapes may lead to the extinction of this species in the European part of Russia. To save the eastern part of the area of T. shuttleworthii, it is necessary to take under protection its populations within the VKCU and to include it in the Red Books of the Udmurt Republic and Tatarstan as vulnerable species.