Stoyan Stoyanov

Bulgarian Academy of Sciences | BAS

The identity of Lithospermum rochelii , so far known only from its type locality (Bulgaria, hills in Plovdiv town), remained hitherto uncertain. Our examination of its original material and re‐collection of the species from its locus classicus in Plovdiv town revealed its identity with Lithospermum glandulosum (syn. Buglossoides glandulosa ) descri...

This article is about the first reliable records of the presence of Galatella sedifolia (≡ Aster sedifolius) in Bulgarian flora. The species was discovered in the Danubian Plain floristic region (Central Northern Bulgaria), in the Studena River Valley, Hadzhidimitrovo village, Svishtov district. It inhabits steppe grasslands and scrublands on sligh...

Sisyrinchium is one of the largest genera in Iridaceae, comprising more than 200 species and native to Hawaiian Islands, Temperate and Subtropical America to Falkland Islands. In Bulgaria, the genus was first reported in 1972 with the species S. angustifolium. In 2020, during field work near the Oshtava village, Kresna district (SW Bulgaria), a spe...

Compounds accumulated on the surface of plant tissues and structures like glandular trichomes and thin epicuticular layer are defined as exudate, external, superficial. ey exhibited important protective activities-antifungal, antibacterial, insect antifeedant, larvicidal, antiplasmodial, and UV protective. e exudate obtained from Helichrysum aren...

Tragopogon coelesyriacus (Asteraceae) is reported for the first time for the Bulgarian flora. It has been recorded in several closely situated localities in the Eastern Rhodopi Mountains, all on the territory of Ivaylovgrad Municipality. The species is easily recognized by the other non-yellow flowering Tragopogon species in the Bulgarian flora by...

Alkanna tinctoria (L.) Tausch Boraginaceae is a medicinal plant whose root is used for its antimicrobial and anti-inflammatory properties. A. tinctoria roots have been subject to numerous studies. However, the aerial parts have been explored less. The objective of the present study was to compare the chemical profile of aerial parts and roots as we...

The taxonomic treatment and geographical distribution of Scrophularia bulgarica (≡ S. variegata var. bulgarica, Scrophulariaceae), a rare and enigmatic taxon in the Bulgarian flora, and application of its name have been revisited. A revised species description and comparison with its closest and nomenclaturally related taxa, S. rupestris and S. het...

Lupinus gredensis is recorded as a new species for the adventive flora of Bulgaria. It was discovered in the Eastern Rhodope Mountains (Ivaylovgrad and Krumovgrad districts). The species grows in open dry grasslands and roadside ruderal vegetation, on siliceous and serpentine substrates. Its most distinctive feature is the change of the flower colo...

In this paper, the current diversity and distribution of genus Bupleurum in Bulgaria are presented. Field and herbarium studies have found that in the Bulgarian flora the genus is represented by 17 species (three perennials and 14 annuals) belonging to four sections. A new key for identification of the sections and taxa is provided. For each specie...

Comparative morphological and ploidy level survey of the polyploid complex B. diandrus-rigidus in the Bulgarian and Romanian floras was performed. Critical examination of the morphology of the collected specimens revealed B. diandrus is represented in both floras. The species has already been reported for Romania under the name B. rigidus. For Bulg...

New data of Bupleurum aequiradiatum, a rare and little-known species in the Republic of North Macedonia, are presented. So far, it has been recorded only in the vicinity of Prilep village based on an old herbarium specimen dates back to 1937. Recently, a new locality was found in the area of "Tekijski Rid", nearby the village Tekija (Skopje valley)...

This is the fourteenth of a series of miscellaneous contributions, by various authors, where hitherto unpublished data relevant to both the Med-Checklist and the Euro+Med (or Sisyphus) projects are presented. This instalment deals with the families Apocynaceae, Compositae, Crassulaceae, Cyperaceae, Euphorbiaceae, Gramineae, Leguminosae, Nyctaginace...

The distribution of Helichrysum arenarium, a medicinal plant with a long tradition in European ethnomedicine, has been updated on the basis of field studies and a review of available literature and herbarium data. The current status of its populations was also evaluated. It was found that in Bulgaria H. arenarium is represented by six populations l...

Thymus aznavourii, a globally threatened species, is reported for the first time to the Bulgarian flora. It was discovered in the southernmost parts of Sakar Mountain in two localities near the villages of Sladun and Mihalich (Svilengrad district, SE Bulgaria). Based on a little-known botanical paper, the species is also recorded as new for the Gre...

COLE TCH, HILGER HH, STEVENS PF, VLADIMIROV V, STOYANOV S (2021) ФИЛОГЕНИЯ НА ПОКРИТОСЕМЕННИТЕ, Систематика на Покритосеменните (Цветните) растения. Българска версия на: COLE TCH, HILGER HH, STEVENS PF (2019) Angiosperm Phylogeny Poster – Flowering Plant Systematics ● Хипотетично филогенетично дърво, основано на молекулярните филогенетични данни ●...

The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019) is a regional database, which was established in 2014. It comprises phytosociological relevés covering various vegetation types from nine countries of the Balkan Peninsula (Albania – 153 relevés, Bosnia and Herzegovina – 1715, Bulgaria – 12,282, Greece – 465, Croatia – 69, Kosovo – 493, Monte...

New chorological data for 5 species from Eastern Rhodopes Mountains are presented - Aethionema rhodopaeum, Micromeria juliana, Thymus jalasianus, Verbascum lagurus, and Verbascum spathulisepalum. All species are found in specific and rare serpentinite habitats and have high conservation value.

The taxonomic status of Seseli peucedanifolium Besser, a little-known and neglected species in the Bulgarian flora, has been revisited. The study of its morphology, fruit anatomy and sequence data (ITS and ETS) revealed that it should not be treated at infraspecific rank under S. rigidum or synonymized with S. tortuosum or S. arenarium. Seseli bess...

This is the twelfth of a series of miscellaneous contributions, by various authors, where hitherto unpublished data relevant to both the Med-Checklist and the Euro+Med (or Sisyphus) projects are presented. This instalment deals with the families Asparagaceae (incl. Hyacinthaceae), Boraginaceae, Cactaceae, Caryophyllaceae, Chenopodiaceae, Compositae...

Thymus jalasianus Stoyanov & Marinov (Lamiaceae), a distinctive species in the section Hyphodromi subsection Serpyllastrum, is described as new to science from the Eastern Rhodope Mountains, southern Bulgaria. The species morphologically resembles T. zygioides and T. granatensis by its prostrate habit, woody radicant stems, holotrichous flowering s...

Papaver nigrotinctum, so far know from Greece, SW Turkey and the Aegean islands, is reported for the first time for the Bulgarian flora. It was found in the southernmost parts of the valley of River Struma (SW Bulgaria). Based on herbarium records, it was erroneously determined as P. apulum. Papaver nigrotinctum appeared also to be novel to the flo...

Astragalus dasyanthus Pall. is one of the rarest representatives of genus Astragalus in Bulgaria and one of the rarest plants of the Bulgarian flora. Because of its high conservation value it is protected by Bulgarian Biodiversity Act and included in the Bulgarian Red Data Book (Vol. 1, Plants and Fungi, 2015) with category “Critically Endangered”....

Bupleurum uechtritzianum, described from Bulgaria in 2010, was synonymized with B. boissieri. Bupleurum boissieri, so far known for Turkey (Asia Minor), Syria and Georgia, first becomes recognized for the Balkans (Northeast Bulgaria and Romanian Dobrogea). Currently in Bulgaria are known four localities of this species: one in Northeast Bulgaria (V...

Dorycnium haussknechtii, so far known for S Turkey (Anatolia) and NW Syria, is reported for the first time for the Balkan and European flora. The species was discovered in a single locality in the southernmost part of Mt Sakar, between Sladun and Varnik villages (SE Bulgaria, Svilengrad district). The article presents data on the morphology, distri...

The species of genus Thymus are important medicinal and aromatic plants. They provoke substantial interest worldwide from phytochemical point of view, due to their diverse biological activities with potential for application in pharmaceutical, cosmetic and food industries. The present study reports results of a survey on the distribution and divers...

Bupleurum uechtritzianum, recently described from Bulgaria, is synonymized with B. boissieri. Bupleurum boissieri, so far known for Georgia, Syria, and Turkey (Asia Minor), first becomes recognized for the Balkans (Northeastern Bulgaria and Romanian Dobrogea) and the Crimea. Bupleurum aequiradiatum, endemic to the Balkans, is reported from Romania...

The aim of the article is to report the presently known localities of Rosa rugosa (Rosaceae) in the Bulgarian flora, and to discuss its alien and invasive status. The species is native to East Asia and has been introduced in Europe, North America and New Zealand where it became established and, in some parts, invasive. In Bulgaria, the taxon was in...

The aim of the article is to report the presently known localities of Rosa rugosa (Rosaceae) in the Bulgarian flora, and to discuss its alien and invasive status. The species is native to East Asia and has been introduced in Europe, North America and New Zealand where it became established and, in some parts, invasive. In Bulgaria, the taxon was in...

New chorological data for Bulgarian flora are presented for Dittrichia graveolens (L.) Greuter (Balkan Range, eastern), Hornungia petraea (L.) Rchb. (West Frontier Mts, Mt Vlahina), Spergula pentandra L. (Northern Black Sea Coast), Euphorbia palustris L. (Northern Black Sea Coast), Onobrychis viciifolia Scop. (Northern Black Sea Coast), Centaurium...

The species of genus Thymus are important medicinal and aromatic plants. They provoke substantial interest worldwide from phytochemical point of view, due to their diverse biological activities with potential for application in pharmaceutical, cosmetic and food industries. The present study reports results of a survey on the distribution and divers...

Centaurea achtarovii Urum. is a Bulgarian endemic, distributed only in Pirin Mountain. It is protected by the Biodiversity Act and included in the Red Data Book of Bulgaria as “endangered”. Assessment of size and density was carried out of both known populations of the species, around Orelyak summit and Kazanite locality. It was conducted in 2 samp...

Bupleurum pauciradiatum is recorded for the first time in the Balkans. It was discovered in the Kaliakra Reserve, the Bulgarian North Black Sea coast. A revised species description and comparison with its morphologically closest taxa—B. asperuloides and B. wolffianum—are given. The name B. pauciradiatum was misused in the countries of Transcaucasia...

Cyperus eragrostis, a native species to South America, is recorded as a new for the adventive flora of Bulgaria. It is currently well established along the roadsides and riverbanks in the vicinities of Brodilovo village (Tsarevo district), Strandzha Nature Park. In Bulgaria, the first herbarium record of C. eragrostis, misidentified as C. glaber, d...

Genus Thymus comprises more than 250 species of perennial herbaceous or fruticose plants, classified into 8 sections. Total 66 species with numerous subspecies and varieties are listed in Flora Europaea. Twenty species occur naturally in Bulgaria. One of them is endemic to the country (Thymus perinicus), four are endemics to the Balkan Peninsula (T...

Centaurea is the fourth largest genus of the family Asteraceae comprising hundreds of species, many of them used as medicinal plants. Centaurea achtarovii is a local Bulgarian endemic, distributed in Pirin Mountain, protected by the Biodiversity Act and included in the Red Data Book of Bulgaria as “endangered”. All its localities are in protected s...

Verbascum tzar-borisii (Dav. еx Stoj.) Stef.-Gat. and Verbascum davidoffii Murb. are Bulgarian endemics, the first one with two populations of about 1000 individuals, the latter with a unique, severely fragmented population. Verbascum anisophyllum Murb. is a Balkan endemic with two populations in Bulgaria and one in Serbia. All the three species ar...

Metabolite profiles of methanolic extracts of leaf samples of five Bulgarian Glaucium flavum Crantz. (Papaveraceae) populations were analyzed by gas chromatography-mass spectrometry (GC/MS). Compounds belonging to alkaloids, fatty and phenolic acids, fatty alcohols, carbohydrates, alkanes and others were identified. In the alkaloid fraction, glauci...

An extensive survey of plant species in the field borders between the crop land and adjacent territories was conducted in representative agricultural areas in Bulgaria. All insect-pollinated plant species, irrespective of their phase of development were recorded. There were totally 4597 records of 374 plant species in 272 experimental plots. Totall...

A new species to the Bulgarian flora is reported-Trinia multicaulis (Api-aceae). It is a Pontic geoelement with a mostly sporadic distribution in the steppe habitats in Eastern Europe. In Bulgaria it has been recorded in 5 localities in NorthEast Bulgaria and Danubian Plain floristic regions. The main distinguishing morphological characters of the...

One of the main threats to the biodiversity of the Danube Delta Biosphere Reserve (DDBR) is the invasive alien species. To develop a sustainable conservation and to implement protection strategies of biodiversity in protected areas is important the early detection and monitoring of the alien species, especially those which are known as aggressive i...

New chorological data to the Bulgarian flora are presented for Torilis leptophylla (L.) Rchb. f., Oxytropis campestris (L.) DC., Haberlea rhodopensis Friv., Saxifraga luteoviridis Schott & Kotschy and Carex rupestris All. Three species are new for Stara Planiana Mountains (Oxytropis campestris, Saxifraga luteoviridis and Carex rupestris). Other two...

Campanula rotundifolia var. bulgarica Nejceff, a neglected taxon in the Bulgarian flora with currently uncertain status, was collected and studied at its locus classicus in the Sokolna (Koru Dere) Reserve of Central Stara Planina Mountain. A detailed morphological analysis of Nejceff’s original material and other related species clearly indicates t...

Centaurea angelescui is reported for the first time to the Bulgarian flora. It was discovered in the valley of Rusenski Lom river, S of Basarbovo village, Ruse district (NE Bulgaria). Until now the species has been known from a few localities in the forest-steppe regions of SE Romania and SW Moldova. The article presents data on the taxonomy, morph...

Photo Atlas of Sparsely Vegetated Ecosystems in Bulgaria aims at presenting in photographs a variety of dune, rock and scree habitats along the Black Sea coast, as well as in the foremountain and mountain territories of Bulgaria. The characteristic plant, fungi and animal species of these habitats are an important element of the biological diversit...

This book is intended to make the reader familiar with the methodology for mapping and assessment of sparsely vegetated land ecosystem condition and services in Bulgaria, as well as to provide information on the obtained results. It comprises rich illustrative material, maps and information about the different habitats relating to the sparsely vege...

New chorological data to the Bulgarian flora are presented for Centaurea pichleri Boiss., Symphyotrichum squamatum (Spreng.) G.L. Nesom, Linum thracicum (Griseb.) Degen, Anemone apennina L., Cyperus odoratus L., Vincetoxicum speciosum Boiss. & Spruner, Linum nodiflorum L., Rosa turcica Rouy, Corallorhiza trifida Châtel. and Calamagrostis pseudophra...

One of the main threats to the biodiversity of the Danube Delta Biosphere Reserve (DDBR) is the invasive alien species. To develop sustainable conservation and to implement protection strategies of biodiversity in protected areas is important the early detection and monitoring of the alien species, especially those which are known as aggressive inv...

New chorological data for Bulgarian flora are presented as follows: Erigeron atticus Vill., Cerinthe glabra Mill., Bromus moesiacus Velen. and Ophrys apifera Huds. from Balkan Range (Central) floristic region; Verbascum adrianopolitanum Podp., Limodorum abortivum (L.) Sw. subsp. mezekii Delip. & Cheshm. and Ophrys apifera Huds. from Tundzha Hilly C...

Centaurea cyanomorpha, so far known only from a single plant collected in May 1926, was rediscovered and studied at its locus classicus Kara Bair, near the town of Topolovgrad (SE Bulgaria). Its taxonomic status varied in times and remained hitherto uncertain. The species has been treated as a synonym of C. pseudaxillaris, C. napulifera and C. depr...

The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019; http://www. givd. info/ID/EU-00019) is a regional database that consists of phytosociological relevés from different vegetation types from six countries on the Balkan Peninsula (Albania, Bosnia and Herzegovina, Bulgaria, Kosovo, Montenegro and Serbia). Currently, it contains 9,580 relevés, an...

Peucedanum obtusifolium is reported for the first time for the Bulgarian flora. So far it has been known only from the maritime sands of the southwestern coastline of the Black Sea in NW Turkey. Peucedanum obtusifolium from the seashore of Bulgaria has been misidentified as P. arenarium subsp. arenarium. Comparison of the important morphological ch...

Verbascum davidoffii Murb. (Scrophulariaceae) is one of the rarest plant species in the Bulgarian flora. It is a Bulgarian endemic, protected by the national Biodiversity Act (2002), included in the Red List of vascular plants in Bulgaria and in the Red Data Book of Bulgaria with conservation status "Critically Endangered". The populations of this...

Astragalus physocalyx (Мехуресточашков клин, мехуресточашково сграбиче), един от най-редките видове в българската флора, е терциерен реликт, защитен от Закона за биологичното разнообразие, включен в Червения списък на висшите растения в България, в Червена книга на Р. България, т. 1, Растения и гъби с категория “критично застрашен”, по критериите н...

Verbascum davidoffii Murb. (Scrophulariaceae) is a biennial herbaceous plant with long glandular black hairs, unbranched stem and golden yellow flowers. It is a Bulgarian endemic, protected by the national Biodiversity Act (2002), included in the Red List of vascular plants in Bulgaria and in the Red Data Book of Bulgaria, with conservation status...

A new alien species – Lepidium virginicum (Brassicaceae), is reported for the Bulgarian flora. The species was first collected in July 2014 at a railway station in Ruse town, Northeast Bulgaria floristic region. The article provides brief morphological description of the species based on the material gathered in Bulgaria, main distinguishing charac...

Sideritis lanata is a rare species important from nature conservation point of view. We present results of a study on plant communities of the species in its natural localities in Bulgaria situated only in south-western part of the country. Rich fl oristic composition was found in the natural habitats of S. lanata, including several rare and endemi...

Conservation of plant diversity is a priority in the environmental policy of Bulgaria. The book presents the main result – a pilot network of small protected sites for the conservation of rare plants using the model of plant micro-reserves – of a project funded by the Life+ Programme of the European Commission. Included are 3 species of bryophytes...

Ambrosia trifida, a native species to North America, is recorded as a new for the adventive flora of Bulgaria. It was found mostly as a weed in the corn-fields at the vicinities of Dalgopol town, Varna District (Northeast Bulgaria), as well as in Kostinbrod town, Sofia floristic region, as a casual. The article presents data for morphology, habitat...

Genista tetragona, so far known as a narrow endemic species for Moldova and Ukraine, was discovered in the river valleys of Cherni Lom and Mali Lom (in the basin of river Rusenski Lom, Northeast Bulgaria). The article presents data on the morphology, distribution, ecology, and the closest relatives of this species. A conservation assessment based o...

New chorological data for the Bulgarian flora are presented for Carduus hamulosus Ehrh., Senecio macrophyllus M. Bieb., Caragana frutex(L.) K. Koch, Geranium tuberosum L., Ophrys apifera Huds., Corynephorus divaricatus(Pourr.) Breistr., Artemisia pontica L., Cota macrantha (Heuff.) Boiss, Picnomon acarna (L.) Cass., Silene asterias Griseb., Onobryc...

In the Bulgarian flora, the Cardamine pratensis group is represented by C. penzesii, C. matthioli and C. rivularis. In the West Rhodope Mts, in localities where C. matthioli, and C. rivularis occur sympatrically or parapatrically, populations of the triploid C. × rhodopaea occur. The morphological, karyological and embryological studies confirm its...

The Balkan endemic species Lathyrus pancicii (Jurišić) Adamović and Verbascum anisophyllum Murb. have very limited distribution on the Balkan Peninsula – Southwestern Bulgaria and Southeastern Serbia

New chorological data for Centaurea kamciensis (rediscovered for the country), Astragalus corniculatus (new for the Northeast Bulgaria floristic region), Astragalus dasyanthus (new for the Northeast Bulgaria floristic region), Astragalus depressus (new for the West Frontier Mountains floristic region) and Caragana frutex (new for the Northeast Bulg...

Erodium absinthoides was rediscovered for Bulgarian Flora. The locality in Vlahina Mountain is situated near Logodazh village, Blagoevgrad district and consist of 3 subpopulation.

New chorological data are presented for 127 species and subspecies from Bosnia and Herzegovina (reports no. 64-72), Bulgaria (48, 52-63, 73, 103-127), Greece (6-37, 49-51, 74-83, 86-102), R Macedonia (46, 47), Montenegro (64) and Turkey-in-Europe (1-5, 38-45, 84, 85). The taxa belong to the following families: Aceraceae (104), Amaranthaceae (87), A...

Plantago sempervirens is reported for the first time for the Bulgarian flora. It was found near the Skrino Gorge of River Struma, in the vicinities of Vukovo village (Boboshevo district), in the floristic region of the Valley of River Struma (Northern). The article presents data on the specificities of the habitat, population structure and dispersa...

Second locality in Bulgaria of the rare species Verbascum anisophyllum is discovered near Vukovo village, Boboshevo district. It is situated 20 km to the SE of the locus classicus known at Konyavo village, Kyustendil district.

Bupleurum uechtritzianum from NE Bulgaria and N Dobrogea (Romania) is described as a species new to science. The species is well distinguished with its large oil ducts visible as broad longitudinal purplish-brown lines on immature fruits. Morphologically, the new taxon is very similar to B. asperuloides and has been misidentified as it for a centur...

New chorological data for three alien species for Bulgaria

A new species of Cyanus Miller, C. diospolitanus Bancheva & S. Stoyanov (Asteraceae, Centaureinae), from Tundzha hilly country floristic region in Elhovo municipality, southeastern Bulgaria, is described and illustrated. It belongs to Cyanus sect. Napuliferi (Stefanoff & T. Georgiev) Bancheva & Raimondo, and taxonomically its closest relative is C....

The article presents the contemporary status of the flora and the phytogeographical characteristics of the mountain and comprises: a floristic list of the vascular plants, including mosses; distribution of the flora on the principle of systematics, by biological type and by origin, and by floristic elements; analysis of the participation of rare, t...