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Систематика та флористика / Систематика и флористика / Systematics and Floristics

The Genus Potamogeton L. (Potamogetonaceae) in the Amur Region

(Far East of Russia)

BOLOTOVA YA.V.

Amur branch of Botanical Garden-Institute FEB RAS

2-nd km Shirotnaya Str., Blagoveshchensk, Amur region, 675000, Russia е-mail: yabolotova@mail.ru

Among water plants (hydrophytes) special interest is focused on the species of a genus pondweed (Potamogeton, Potamogetonaceae). This genus is widespread in reservoirs of northern and southern hemispheres and counts about 100 species. There are 26 species of this genus on the territory of the Far East of Russia.

In territory of the Amur region, on the basis of our field researches (2005-2007) and the surveys of collections of Herbariums of Institute of Biology and Soil FEB RAS (VLA), the N.V. Tsitsin Main Botanical Garden RAS (MHA), biological faculty of the Moscow state University (MW), V.L. Komarov Botanical Institute RAS (LE), reveals 18 species of genus Potamogeton: P. berchtoldii Fieb. – Berchtold pondweed, P. compressus L. – flattened pondweed, P. crispus L. – curly-leaved pondweed, P. distinctus A. Benn. – distinct pondweed, P. gramineus L.

– grass-leaved pondweed, P. juzepczukii P. Dorof. et Tzvel. – Juzepczuk pondweed, P. lucens L. – shining pondweed, P. maackianus A. Benn. – Maack pondweed, P. malaianus Miq. – Malayan pondweed, P. manchuriensis (A. Benn.) A. Benn. – Manchurian pondweed, P. natans L. – floating pondweed, P. obtusifolius Mert. et Koch – blunt-leaved pondweed, P. octandrus Poir. – eightstaminated pondweed, P. pectinatus L. – fennel-leaf pondweed, P. perfoliatus L. – clasping-leaf pondweed, P. pusillus L. – small pondweed, P. richardsonii (A. Benn.) Rydb. – Richardson pondweed, P. tenuifolius Rafin. – thin-leaved pondweed.

P. distinctus, P. lucens, P. malaianus are rare for the Amur region and can be recommended for inclusion in the new edition of the Red book of the Amur region.

Pollen morphology of the genus Cistanche (Orobanchaceae) in Iran

SHAHRYAR SAEIDI MEHRVARZ, ROBABEH SHAHI

Department of Biology, Faculty of Science, University of Guilan, Rasht, Iran P. O. Box 41335-1914, Rasht, Iran

е-mail: saeidimz@guilan.ac.ir

Pollen morphology of 6 species of the genus Cistanche Hoffmg. distributed in Iran were examined by LM and SEM. Detailed pollen morphological characteristics are given for these

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Систематика та флористика / Систематика и флористика / Systematics and Floristics

species. Of these, 4 species have not been considered in former studies sofar. Pollen samples were acetolyzed. Length of equatorial and polar axis were measured with aid of a ×100 eyepiece. Measurement of grains was based on 30 grains per sample. Pollen grains are shed as monads. They are tricolpate (with three, equidistant, furrow-like apertures that are perpendicular), or tetracolpate, isopolar and elongated-spherical to oblong-spherical in equatorial view. They are also radiosymmetric.. The type of microgemmate is more frequent among species examined and occurs in 3 species of C. salsa, C. ambigua and C. ridgewayana. Types of microornate , microhammulate and microscarbate also observed in C. tubulosa, C. flava and C. laxiflora, respectively.

About problems of systematization and identification species Carex subgenus Kreczetoviczia T.V. Egorova (Cyperaceae)

SHEKHOVTSOVA I.N.

The central Siberian botanical garden of the Siberian Branch of the Russian Academy of Science, Laboratory of Systematics of Higher Vascular Plants

Zolotodolinskaya St., 101, Novosibirsk, 630090, Russia е-mail: maklakovain@mail.ru

The genus Carex L. is one of the largest and one of the most widespread genera of native and world flora. It consists of over 2000 species.

Essential changes have been made during the 1930th by Kreczetovicz (1935) in the classification of the genus Care: new taxa of different rank were introduced and new nomenclature combinations were proposed. T.V.Egorova (1999) conducted a critical revision of this genus in the flora of Russia and the adjacent states and the new, more differentiated system was developed. New information on the distribution and ecology of species in separate regions is constantly added.

The genus is traditionally considered difficult for systematics because of significant polymorphism and complexity of differentiation of taxa. Special attention deserves subgenus Kreczetoviczia T.V. Egorova, isolated by Egorova (1985), which is presented on the territory of the former USSR by 48 species and subspecies from five sections. In contemporary studies many authors, especially foreign ones, do not consider examine subgenus Kreczetoviczia. For example, in the study of the genus for the flora of North America the authors (Ball et al., 2002) accept the system of the well-known American caricologist K. Mackenzie (1931, 1935) who did not consider the division of sedges into subspecies, distributing them only between sections. Other authors include these species in the subgenus Carex (=Eucarex Coss. et Germ., nom. illeg.) (Kreczetovicz, 1935; Tzvelev, 2000). In this study we consider it necessary following Egorova (1999) not only to concretize the object of our researches, but also to recognize the isolation of subgenus Kreczetoviczia considering the morphological isolation of the encompassing taxa and their common phylogeny.

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Систематика та флористика / Систематика и флористика / Systematics and Floristics

The most difficult for definition is the group of sedges, the section Phacocystis Dumort. [=sect. Acutae (Carey) Christ]. Complexity of this group is associated not only with high polymorphism of its species, but also with existence of numerous partially fertile hybrids between them as a result of introgressive hybridization. Possible consequence is the substantial polymorphism of attributes and their variability over a wide range, forming adjacent intervals on morphological border of taxa. Very often only more or less typical samples of species can be differed reliably. Thus, despite the long history of studies of sedges, questions on systematics and identification of species of the subgenus Kreczetoviczia are still insufficiently studied and require the further studies utilizing new material and modern techniques.

This study was conducted with financial support of the Russian Federal Property Fund (the project 07-04-00877).

REFERENCES

1.Ball et al. Carex L. // Flora of North America north of Mexico. Flora of North America. Magnoliophyta: Commelinidae (in part): Cyperaceae. – New York: Oxford, 2002. – Vol. 23. – P. 254–573.

2.Egorova T.V. New taxa of the genus Carex (Cyperaceae) // Bot. Jour. (Moscow and Leningrad). – 1985. –70. № 11. – P. 1549-1554.

3.Egorova T. V. The sedges (Carex L.) of Russia and adjacent States (within the limits of the former URSS). – St.-Petersburg, 1999. – 772 p.

4.Kreczetovicz V. I. Carex L. // Flora of the USSR. – Leningrad, 1935. – T. 3. – P. 111–464.

5.Mackenzie K.K. Cyperaceae-Cariceae // North American Flora. – New York, 1931, 1935.

– Vol. 18. – 478 p.

6.Tzvelev N.N. Manual of the vascular plants of North-West Russian (Leningrad, Pskov and Novgorod provinces). –St.-Peterburg: Chemical-Pharmaceutical Academy Press, 2000. – 781 p.

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Екологія та фітосозологія Экология и фитосозология

Ecology and phytosociology

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