10.1515/botlit-2016-0016

BOTANICA LITHUANICA ISSN 2029-932X 2016, 22(2): 153–160

NEW ALIEN SPECIES RECORDED IN THE SOUTHERN REGIONS OF LATVIA

Zigmantas Gu d ž i n s k a s *, Lukas Pe t r u l a i t i s

Nature Research Centre, Institute of Botany, Žaliųjų Ežerų Str. 49, Vilnius LT-08406, Lithuania *Corresponding author: [email protected]

Abstract

Gudžinskas Z., Petrulaitis L., 2016: New alien plant species recorded in the southern regions of Latvia [Pieti- niuose Latvijos rajonuose aptiktos naujos svetimžemės augalų rūšys]. – Bot. Lith., 22(2): 153–160.

Alien are one of the most dynamic and rapidly changing components of flora. Many intentionally intro- duced plants, which formerly were in cultivation only, now are increasingly found escaped and occur in ant- hropogenic or seminatural habitats. During field investigations in the southern districts of Latvia in 2014–2016, six new alien plant species were recorded: Allium nutans, Hylotelephium spectabile, Solidago ×niederederi, dumosum, S. lanceolatum and S. novae-angliae. To date, four species, Allium nutans, Hylote- lephium spectabile, Symphyotrichum dumosum and S. novae-angliae, occur as casual aliens in Latvia. Solidago ×niederederi should be ascribed to the group of established species, whereas Symphyotrichum lanceolatum has naturalized and is potentially invasive. Notes on morphology and identification of species as well as characte- ristics of the recorded populations are discussed. A note on 20 other alien plant species recorded in wastelands, abandoned meadows and unused arable fields in the south-western part of Daugavpils city is also provided. Keywords: anthropogenic habitats, invasive species, naturalization, populations.

INTRODUCTION degradation of natural habitats and transformation of native vegetation, thus facilitating the spread of alien Alien plant species are one of the most dynamic plant species. and rapidly changing components of flora, and stud- Reduction of negative impact of invasive alien ies on their immigration, naturalization and spread plant species on ecosystems and biodiversity is a are essential to diminish potential negative conse- task of the uttermost importance. The first step to quences (Ko w a r i k , 2008). Nowadays, large numbers achieve this task is prevention or early eradication of intentionally introduced plants, formerly being of alien species before they became widespread and only in cultivation, are increasingly found escaped caused significant changes in ecosystems (Le v i n e et and occur in various human-made, disturbed or semi- al., 2003; An d r e u & Vi l á , 2011). Thus, constant sur- natural habitats (Pe r g l et al., 2016). vey and detection of newly arrived alien plants is the Alien plant species comprise 33% of the vascu- main source of information to reveal potentially dan- lar plant flora of Latvia (Ga v r i l o v a & Šu l c s , 1999; gerous species and make decisions for their control. Pr i e d e , 2009). Though the diversity of vascular plants in Latvia is well studied, the diversity of al- MATERIALS AND METHODS ien plants constantly increases, and further increase should be expected in the future. The strengthening Field studies were conducted in the southern dis- impact of urbanization and development of transport tricts of Latvia (Tērvete, Vecumnieki, Daugavpils infrastructure, changes in land use and transforma- municipalities) in September 2014 and 2016. Herbar- tion of landscape and climate changes promote the ium specimens of the described and other collected

153 Gu d ž i n s k a s Z., Pe t r u l a i t i s L. alien plant species were deposited at the Herbarium Hylotelephium spectabile (Boreau) H. Ohba of the Institute of Botany of the Nature Research (Sedum spectabile Boreau). This species is native to Centre (BILAS) in Vilnius. The nomenclature of China and Korea (Fu & Oh b a , 2001). In the native plant taxa is presented after Br o u i l l e t et al. (2006), range, it grows on rocky slopes of low mountains and Ji e m e i & Ka m e l i n (2000), Fu & Oh b a (2001) and at forest margins. Hylotelephium spectabile is widely Pl i s z k o (2015). The most frequently used synonyms cultivated as an ornamental plant (Eg g l i , 2003). In are also provided. Alien plant species are arranged in Lithuania, it was recorded for the first time in 1999 alphabetical order. The text of the herbarium speci- as escaped from cultivation and was considered as men labels is provided. Geographical co-ordinates casual (Gu d ž i n s k a s , 2000). Data on the occurrence are indicated according to WGS 1984 standard. of this species in the region of Daugavpils (Fa- t a r e , 1989; Ru t k o v s k a & Ze i ļ a , 2009) as well as in RESULTS AND DISCUSSION other regions of Latvia (Ga v r i l o v a & Šu l c s , 1999; Pr i e d ī t i s , 2014) are absent. Allium nutans L. This species is native to East Three clumps of H. spectabile were found in an Russia (West and East Siberia), Kazakhstan, Mon- abandoned cultivated meadow and in a rubbish heap golia and North-West China (Vv e d e n s k i i , 1968; Ji e - in the southern part of Daugavpils. m e i & Ka m e l i n , 2000). In the native range, A. nutans Hylotelephium spectabile in Latvia should be grows in steppes, dry and damp meadows, on stony ascribed to the group of casual aliens, however, slopes. In Europe, this species is frequently culti- as many other species of the Crassulaceae family vated for ornamental purposes and as a vegetable (Gu d ž i n s k a s , 1999; Ru t k o v s k a & Ze i ļ a , 2009; Ge d - (Ka m e n e t s k y & Fr i t s c h , 2002). In Lithuania and Es- e r a a s et al., 2012) it can easily become established, tonia, A. nutans has not been reported so far. but its invasion is hardly possible. A group of plants occupying a total of 0.3 m2 Examined specimen. Daugavpils, the south- area were recorded in an abandoned mesic cultivated western part of the city, to the southwest from Gulbju meadow. Four clearly defined dense clumps ofA. nu- Str., in an abandoned cultivated meadow, three small tans were separated by 0.5–1 m distance. One of the clumps; 55.867298 N, 26.491540 E; 24 September clumps was with five inflorescences. At the end of 2016, leg. et det. Z. Gudžinskas. September, the were already ripe and a part of capsules were opened and shed the seeds. This spe- Solidago ×niederederi Khek. This is a natural cies should be ascribed to the group of casual aliens hybrid between the alien S. canadensis L. s. l. and in Latvia, however, it has a potential to become lo- the native S. virgaurea L. s. str. In recent years, it has cally established. Allium nutans is cultivated quite been increasingly found in several European countries often, it also can be found in other localities escaped (Ni l s s o n , 1976; St a c e , 1991; Ot t o et al., 2005; Pl i s z - from cultivation with garden wastes. k o , 2013, 2015; Gu d ž i n s k a s & Žalneravičius , 2016; Allium nutans is a perennial plant with solitary or Ka r p a v i č i e n ė & Ra d u š i e n ė , 2016; Pl i s z k o & paired conical bulbs, attached to a horizontal or slightly Za l e w s k a -Ga ł o s z , 2016, etc.). In Lithuania, ascending stout rhizome. Scape is 30–60 cm long, with S. ×niederederi is quite frequent in mixed popula- two usually winged ribs in upper part. The number of tions of S. canadensis and S. virgaurea (Gu d ž i n s k a s leaves is 6–8, they are flat, glaucous, 8–15 mm broad. & Žalneravičius , 2016; Ka r p a v i č i e n ė & Umbel spherical, rarely sub-spherical, drooping before Ra d u š i e n ė , 2016). flowering. Perianth is pale red or pale purple (Vv e d e n - Two stands of S. ×niederederi were recorded on s k i i , 1968; Ji e m e i & Ka m e l i n , 2000). the southern edge of Daugavpils. The distance be- Examined specimen. Daugavpils, the south- tween these stands was about 0.5 km. The first stand western part of the city, to the southwest from Gul- of S. ×niederederi included three mature generative bju Str., in an abandoned cultivated meadow, four individuals. Two clumps were quite small, having clumps occupying the area of 0.3 m2; 55.866334 N, three and four generative shoots, respectively, where- 26.485798 E; 24 September 2016, leg. et det. as the third clump was larger, with 17 generative and Z. Gudžinskas and L. Petrulaitis. three vegetative shoots. The second stand consisted

154 New alien plant species recorded in the southern regions of Latvia of seven individuals that had from one to three gen- the shape of vegetative shoots. At the anthesis or lat- erative shoots and only one individual was with one er, an individual of S. ×niederederi frequently forms vegetative shoot. Thus, we suppose that the plants in one or several vegetative shoots that have at the apex the second stand were younger than the plants in the densely crowded leaves in the form of pseudo-rosette first one, and both stands were a result of separate (Gu d ž i n s k a s & Žalneravičius , 2016). events of hybridization. Because S. ×niederederi is a result of hybridiza- This hybrid can be easily distinguished from the tion between native and alien species, according to parental species by the shape of the synflorescence, the concept by Py š e k et al. (2004), it should be treat- shape, size and density of leaves on the stem, the size ed as an alien species in Latvia as well as in other of capitula as well as by the size and number of ray regions of Europe. Considering distribution and size and disc flowers in a capitulum. The synflorescence of populations of S. ×niederederi in Lithuania, in of S. ×niederederi is paniculate, with branches di- Latvia it should be treated as an established alien. It verging at an acute angle (Fig. 1), whereas the syn- is expected that the hybrid is more widely distributed florescence of S. canadensis usually is pyramidal in Latvia and may occur in the areas, where the pa- with branches diverging at a wide angle. Capitula of rental species grow together or in nearby areas. S. ×niederederi are three to four times larger than Examined specimens. 1. Daugavpils, the south- those of S. canadensis, and are approximately one- western part of the city, to the southwest from Gul- third or half the size of the capitula of S. virgaurea. bju Str., in an abandoned cultivated meadow, three Another characteristic feature of the hybrid plants is clumps; 55.866932 N, 26.489586 E; 24 September 2016, leg. et det. Z. Gudžinskas; 2. Daugavpils, the south-western part of the city, to the southwest from Gulbju Str., in an abandoned cultivated meadow, seven clumps; 55.866334 N, 26.485798 E; 24 Sep- tember 2016, leg. et det. Z. Gudžinskas.

Symphyotrichum dumosum (L.) G. L. Nesom ( dumosus L.). Symphyotrichum dumosum is native to North America and is distributed through- out the most of the continent (Br o u i l l e t et al., 2006). In North America, in its primary distribution range, S. dumosum occupies moist or wet soils, sedge meadows, marshes, swamps, flood plains, sandy or calcareous flats, loamy prairies, old fields, sandy to muddy shores of lakes and ponds and interdunal hollows. Sometimes it is also found in dry, sandy, well-drained and nutrient-poor soils (Br o u i l l e t et al., 2006; Ka r b e r g , 2009). This species is quite easily distinguished from oth- er species of the genus Symphyotrichum by the thick stem leaves and peduncles that are densely covered with small -like leaves. Ray flowers are usually white to pale blue, but this species is widely cultivated as an ornamental plant and, therefore, many cultivars with various colours of ray flowers were developed (Hetterscheid & Va n d e n Be r g , 1996; Br o u i l l e t et al., 2006). In Latvia, the collected plants were with Fig. 1. Solidago ×niederederi in an abandoned meadow in the blue ray flowers, whereas plants with white ray flow- south-western part of Daugavpils (photo by Z. Gudžinskas) ers, which prevail in Lithuania, were not found in the

155 Gu d ž i n s k a s Z., Pe t r u l a i t i s L. investigated area. Individuals of Symphyotrichum dumosum recorded in Daugavpils were up to 0.5 m high and tended to be significantly lower than plants occurring in Lithuania. In Daugavpils, Symphyotrichum dumosum most likely survived after the abandonment of small gar- den plots or were dumped with garden wastes. To date, this species should be considered as casual al- ien in Latvia, however, its establishment and further spread is expected. Examined specimen. Daugavpils, the south-west- ern part of the city, to the southwest from Gulbju Str., in an abandoned cultivated meadow and wasteland, four groups of plants occupying the areas of 0.5–4 m2; 55.866333 N, 26.485795 E; 24 September 2016, leg. et det. Z. Gudžinskas and L. Petrulaitis.

Symphyotrichum lanceolatum (Willd.) G. L. Ne- som (Aster lanceolatus Willd.). This species is native to North America and has nearly a transcontinental distribution, extending across southern from Nova Scotia, south to central Georgia and northern (Se m p l e & Ch m i e l e w s k i , 1987). Symphyot- richum lanceolatum is one of the most widespread Fig. 2. Symphyotrichum lanceolatum on the edge of forest in alien species in Europe (La m b d o n et al., 2008). It is a the vicinities of Medumi (photo by Z. Gudžinskas) naturalized species in Estonia (Ku kk , 1999; Ööp i k et al., 2008), whereas in Lithuania, it is a potentially S. lanceolatum in Latvia were formed by plants with invasive species (Gu d ž i n s k a s , Pe t r u l a i t i s , 2016). white ray flowers. It should be noted that at the begin- In the period of investigations, we recorded three ning of flowering usually white flowers turn to pale populations of this species in Latvia. First population bluish or pinkish at the end of anthesis. The colour of of S. lanceolatum was found in Lāči village (Tērvete ray flowers can change at herbarium specimen drying district) in 2014. It occupied about 100 m2 area in an time. abandoned meadow on the edge of forest, in a ditch of It should be noted that in Latvia only S. ×salig- the road and adjacent areas. Extensive areas occupied num has been reported (Ga v r i l o v a & u l c s , 1999; by this species were registered on the banks of the Pr i e d e , 2009; Pr i e d ī t i s , 2014). In Latvia, S. ×salig- River Mēmele (in Lithuania, the River Nemunėlis) num has been registered in 159 grid squares (5 × east of Skaistkalne (Vecumnieki district). It grows in 5 km) and considered as invasive (Pr i e d e , 2009). We riparian tall herb fringe communities, along edges of suppose that S. lanceolatum is not distinguished from riparian forests and in mesic meadows. In 2016, it S. ×salignum and a significant part of its records in was recorded in a ditch along the road north of Me- Latvia should be referred to S. lanceolatum. Revision dumi. It occupied about 30 m long and 2–6 m wide of herbarium specimens is necessary to confirm our belt along the road and the forest edge (Fig. 2). presumption. Symphyotrichum lanceolatum is a highly polymor- Symphyotrichum lanceolatum should be treated phic species and is often easily confused with several as a naturalized and potentially invasive alien species other species of this genus (Ch m i e l e w s k i & Se m - in Latvia. Although we have not investigated the de- p l e , 2001). Ray flowers vary in colour from white to velopment of seeds in Latvian populations, we have pale pink or pale blue or blue-violet (Ch m i e l e w s k i & observed that in North Lithuania S. lanceolatum pro- Se m p l e , 2001; Me i n e r t et al., 2009). Populations of duces viable seeds (Gu d ž i n s k a s , Pe t r u l a i t i s , 2016).

156 New alien plant species recorded in the southern regions of Latvia

Thus, generative reproduction of this species in 24 September 2016, leg. et det. Z. Gudžinskas and Latvia is highly probable. Seeds of S. lanceolatum L. Petrulaitis. can be easily dispersed both by wind and water. Hav- Twenty other alien plant species previously reg- ing in mind that the size of populations increases by istered in Daugavpils (Fa t a r e , 1989; Ru t k o v s k a et vigorous rhizomes, it is expected that this species will al., 2008, 2011, 2013, etc.) or in other regions of become even more abundant in the areas of current Latvia (Ga v r i l o v a & Šu l c s , 1999; Pr i e d ī t i s , 2014, occurrence. etc.) were also recorded in the south-western part of Examined specimens. 1. Tērvete district, Lāči Daugavpils city in September 2016. The most abun- village, at the cross of roads Žagarė–Augstkalne and dant alien species in abandoned meadows, waste- Bukaiši–Lāči, in a meadow and on the edge of forest, lands and unused arable fields were:Erigeron annuus very abundant; 56.375708 N, 23.281069 E; 16 Sep- (L.) Pers., E. canadensis L., Galinsoga parviflora tember 2014, leg. et det. Z. Gudžinskas and L. Petru- Cav., G. quadriradiata Ruiz. et Pav., Helianthus tu- laitis; 2. Daugavpils district, 2 km north-east of Me- berosus L., Lupinus polyphyllus Lindl., Solidago dumi, on the left side of the road Zarasai–Daugavpils, canadensis L. s. l. Much less frequent were species in a ditch and on the edge of forest, very abundant; such as Asparagus officinalis L., Acer negundo L., 55.794339 N, 26.376488 E; 24 September 2016, leg. Dipsacus fullonum L., Echinocystis lobata (Michx.) et det. Z. Gudžinskas and L. Petrulaitis. Torr. et A. Gray, Heracleum sosnowskyi Manden., Parthenocissus quinquefolia (L.) Planch., Physalis Symphyotrichum novae-angliae (L.) Nesom (As- alkekengi L., Prunus cerasifera Ehrh., Rosa rugosa ter novae-angliae L.). This species is native to North Thunb., R. spinosissima L., Rudbeckia laciniata L., America and occurs commonly throughout the east- Rumex confertus Willd. and Ribes uva-crispa L. ern deciduous forest region, the Great Plains, and its Though the flora of Latvia is well investigated, isolated populations are known from South Dakota the results of this short research indicated that immi- to New Mexico (Se m p l e & Br o u i l l e t , 1980; Se m - gration of new alien species is quite intense ongoing p l e , 1984). Symphyotrichum novae-angliae is a quite process. New alien species appear both in heavily dis- commonly naturalized alien in South and Central Eu- turbed urban areas and in seminatural or even natural rope (Ya v o r s k a , 2009; La k u š i ć & Jo v a n o v i ć , 2012; habitats. Attention should be paid to the escaped plant Me d v e c k á et al., 2012; Py š e k et al., 2012). In Estonia, species even if they at present cannot survive for a it has not been reported (Ku kk , 1999). In Lithuania, S. long time outside areas of cultivation. Each record novae-angliae is a quite rare established alien species can provide valuable information in the future on the (Gu d ž i n s k a s , 1997; Gu d ž i n s k a s , Pe t r u l a i t i s , 2016). intricate process of establishment, spread and inva- In Latvia, S. novae-angliae was recorded for the sion of certain alien plant species. first time in Daugavpils in an abandoned wasteland. A total of three groups of plants were registered forming REFERENCES almost pure stands, which occupy the areas of 4 m2, 2 m2 and 1.5 m2, respectively. Currently, this spe- An d r e u J., Vi l á M., 2011: Native plant community cies should be ascribed to the group of casual aliens, response to alien plant invasion and removal. – however, its establishment is expected. Rhizomes of Management of Biological Invasions, 2: 81–94. S. novae-angliae are short, thus it forms dense stands Br o u i l l e t L., Se m p l e J.C., Al l e n G.A., Ch a m - and its vegetative spread is quite slow. b e r s K.L., Su n d b e r g D.S., 2006: Symphyotri- Examined specimens. 1. Daugavpils, the south- chum – In: Flora of North America north of Mex- western part of the city, to the southwest from Gulbju ico, 20: 465–530. – Oxford. Str., in an abandoned cultivated meadow, on the edge Ch m i e l e w s k i J.G., Se m p l e J.C., 2001: The biology of of shrub grove, 4 m2; 55.865410 N, 26.488332 E; Canadian weeds 113. Symphyotrichum lanceola- 24 September 2016, leg. et det. Z. Gudžinskas and tum (Willd.) Nesom [Aster lanceolatus Willd.] L. Petrulaitis; 2. Daugavpils, the south-western part and S. lateriflorum (L.) Löve & Löve [Aster lat- of the city, to the southwest from Gulbju Str., be- eriflorus (L.) Britt.]. – Canadian Journal of Plant tween the shrubs, 2 m2; 55.867027 N, 26.489815 E; Sciences, 81: 829–849.

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158 New alien plant species recorded in the southern regions of Latvia

Pe r g l J., Sá d l o J., Pe t ř í k P., Da n i h e l k a J., Ru t k o v s k a S., Ju r š e v s k a G., Ev a r t s -Bu n d e r s P., Ch r t e k J. Jr., He j d a M., Mo r a v c o v á L., Pe r - 2008: Invasive woody species of Rosaceae in g l o v á I., Št a j e r o v á K., Py š e k P., 2016: Dark side Daugavpils (Latvia). – Neobiota, 8: 161–167. of the fence: ornamental plants as a source for Ru t k o v s k a S., Pu č k a I., Ev a r t s -Bu n d e r s P., spontaneous flora of the Czech Republic. – Pres- Pa i d e r e J., 2013: The role of railway lines in the lia, 88: 163–184. distribution of alien plant species in the territory Pl i s z k o A., 2013: A new locality of Solidago ×nied- of Daugavpils City (Latvia). – Estonian Journal erederi Khek (Asteraceae) in . – Biodiver- of Ecology, 62(3): 212–225. sity Research and Conservation, 29: 57–62. Ru t k o v s k a S., Pu č k a I., No v i c k a I., 2011: Analysis Pl i s z k o A., 2015: Neotypification of Solidago ×nie- of invasive flora in cemetery territories of the city derederi (Asteraceae). – Phytotaxa, 230: 297– of Daugavpils. – In: Environment. Technology. 298. Resources. Proceedings of the 8th International Pl i s z k o A., Za l e w s k a -Ga ł o s z J., 2016: Molecular Scientific and Practical Conference, 11: 344– evidence for hybridization between invasive Sol- 351. – Rēzekne. idago canadensis and native S. virgaurea. – Bio- Se m p l e J.C., 1984: Cytogeographic studies on North logical Invasions, 18(11): 3103–3108. American Asters. I. Range surveys of Virgulus Pr i e d e A., 2009: Invazīvie neofīti Latvijas florā: adnatus, V. concolor, V. georgianus, V. grandi- izplatība un dinamika. – Rīga. florus, V. novae-angliae, V. oblongifolius, V. pat- Pr i e d ī t i s N., 2014: Latvijas augi. – Rīga. ens, and V. walteri. – American Journal of Bota- Py š e k P., Da n i h e l k a J., Sá d l o J., Ch r t e k J.Jr., ny, 71: 522–531. Ch y t r ý M., Ja r o š í k V., Ka p l a n Z., Kr a h u l e c F., Se m p l e J.C., Br o u i l l e t L., 1980: A synopsis of North Mo r a v c o v á L., Pe r g l J., Št a j e r o v á K., Ti c h ý L., American asters: the subgenera, sections and sub- 2012: Catalogue of alien plants of the Czech Re- sections of Aster and Lasallea. – American Jour- public (2nd edition): checklist update, taxonomic nal of Botany, 67: 1010–1026. diversity and invasion patterns. – Preslia, 84: Se m p l e J.C., Ch m i e l e w s k i J.G., 1987: Revision of 155–255. the Aster lanceolatus complex, including A. sim- Py š e k P., Ri c h a r d s o n D.M., Re j m á n e k M., We b - plex and A. hesperius (Compositae: Astereae): s t e r G., Wi l l i a m s o n M., Ki r s c h n e r J., 2004: Al- a multivariate morphometric study. – Canadian ien plants in checklists and floras: towards better Journal of Botany, 65: 1047–1062. communication between taxonomists and ecolo- St a c e C., 1991: New flora of the British Isles. – gists. – Taxon, 53: 131–143. Cambridge. Ru t k o v s k a S., Ze i ļ a I., 2009: Invazīvo biezlapju dz- Vv e d e n s k i i A.I., 1968. Allium L. – In: Ko m a r o v V.L. imtas sugu izplatība Daugavpils pilsētas teritorijā (ed.), Flora of the USSR, 4: 112–280. – Wash- (Latvija). Distribution of invasive species ington. (Crassulaceae) in the Daugavpils city (Latvia). – Ya v o r s k a O.G., 2009: The North American species In: Environment. Technology. Resources. Pro- of the non-native flora of the Kyiv urban area ceedings of the 7th International Scientific and (Ukraine): a checklist and analysis. – Biodiver- Practical Conference, 2: 30–34. – Rēzekne. sity: Research and Conservation, 13: 25–30.

159 Gu d ž i n s k a s Z., Pe t r u l a i t i s L.

PIETINIUOSE LATVIJOS RAJONUOSE APTIKTOS NAUJOS SVETIMŽEMĖS AUGALŲ RŪŠYS

Zigmantas Gu d ž i n s k a s *, Lukas Pe t r u l a i t i s

Santrauka

Svetimžemiai augalai yra labai dinamiška ir spar- hium spectabile, Symphyotrichum dumosum ir S. no- čiai kintanti bet kurio regiono floros dalis. Daug tiks- vae-angliae – šiuo metu turėtų būti priskirti prie lingai įveistų ir anksčiau tik želdynuose arba soduose neįsitvirtinusių rūšių grupės. Solidago ×niederederi augintų augalų dabar vis dažniau aptinkami sulaukė- yra įsitvirtinusi ir ateityje galinti plisti, o Symphyotri- ję ir augantys antropogeninėse arba pusiau natūralio- chum lanceolatum yra natūralizavusi ir potencialiai se buveinėse. invazinė rūšis. Pietiniuose Latvijos rajonuose 2014–2016 m. Straipsnyje trumpai aprašomi rūšių morfologiniai vykdant tyrimus buvo aptikti šešių svetimžemių rū- ir svarbiausi skiriamieji požymiai, pateikiama duo- šių augalai, kurie šioje šalyje anksčiau nebuvo už- menų apie aptiktų populiacijų dydį. Pateikta trumpa registruoti: Allium nutans, Hylotelephium spectabile, informacija apie dar 20 svetimžemių augalų rūšių, Solidago ×niederederi, Symphyotrichum dumosum, aptiktų pietvakariniame Daugpilio miesto pakraštyje S. lanceolatum ir S. novae-angliae. Keturių rūšių esančiame dykviečių, apleistų kultūrinių pievų ir ne- svetimžemiai augalai – Allium nutans, Hylotelep- naudojamų dirbamų laukų masyve.

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