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Papers by Stoyan Stoyanov

Research paper thumbnail of Sisyrinchium rosulatum (Iridaceae), a new alien species to the Bulgarian flora

Research paper thumbnail of A new species record of Tragopogon (Asteraceae) for the Bulgarian flora

Phytologia Balcanica: International Journal of Balkan Flora and Vegetation, Dec 15, 2022

Research paper thumbnail of Systematical and phytogeographical analysis of the flora on Mt Golo Bardo

bio.bas.bg

Abstract. The article presents the contemporary status of the flora and the phytogeographical cha... more Abstract. 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 ...

Research paper thumbnail of The pink flowering Crepis rubra (Asteraceae) - new for the Bulgarian flora

Crepis rubra is reported for the first time for the Bulgarian flora. The species was discovered n... more Crepis rubra is reported for the first time for the Bulgarian flora. The species was discovered near Madzharovo town, in the floristic region of the Eastern Rhodopi Mts. The article contains information about its morphology, general distribution, habitat, and population.

Research paper thumbnail of Plantago sempervirens (Plantaginaceae): a dwarf shrub new for the Bulgarian flora

Plantago sempervirens is reported for the first time for the Bulgarian flora. It was found near t... more 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 dispersal modes of this species. The determined chromosome number is 2n = 12.

Research paper thumbnail of Taxonomic redefinition of Bupleurum pauciradiatum and B. wolffianum (Apiaceae)

Phytotaxa, 2018

Bupleurum pauciradiatum is recorded for the first time in the Balkans. It was discovered in the K... more 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 for B. wolffianum. Bupleurum wolffianum is found conspecific with B. leptocladum, and the latter is reduced into synonymy. The records of B. pauciradiatum in the Crimea belong to B. asperuloides.

Research paper thumbnail of On the distribution of Helichrysum arenarium (l.) Moench (Asreraceae) in Bulgaria

ARPHA Conference Abstracts, 2019

Helichrysum arenarium (L.) Moench is herbaceous perennial plant belonging to Asteraceae family. T... more Helichrysum arenarium (L.) Moench is herbaceous perennial plant belonging to Asteraceae family. The plant is well known in phytotherapy for its potential in the treatment of gallbladder disease and is classified as endangered in a number of European countries. In Bulgaria it is a protected species according to the Biodiversity Act (Annex 4) and is in the List of Species of Medicinal Plants under special regimen of conservation and use. The data on the distribution of H. arenarium in the Bulgarian flora have not been updated for more than 20 years. The aim of this study is to determine the current distribution of H. arenarium in Bulgaria on the basis of reviewing the available herbarium specimens in the Bulgarian herbariums, literature data, and personal collections. As a result, the locations of the species on the territory of the country were described and mapped. In Bulgaria H. arenarium is represented with only a few populations located in a limited area in the northeastern part ...

Research paper thumbnail of Contribution to the taxonomy and distribution of Bupleurum boissieri, B. aequiradiatum and B. gerardi (Apiaceae) in the Balkans

Phytotaxa, 2019

Bupleurum uechtritzianum, recently described from Bulgaria, is synonymized with B. boissieri. Bup... more 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 for the first time, and is excluded from Albania and Croatia. Bupleurum gerardi does not occur in the Balkans and its records in Bulgaria belong to B. commutatum. The lectotype of B. aequiradiatum is also designated here. A dichotomous key to the Balkan representatives of Bupleurum section Juncea and close-up photographs of their diagnostic characters are provided.

Research paper thumbnail of A new perennial Bupleurum species for the Bulgarian flora

During the investigation of the flora of Mt Vitosha in 2003 a new native species Bupleurum ranunc... more During the investigation of the flora of Mt Vitosha in 2003 a new native species Bupleurum ranunculoides L. for Bulgarian flora was found. The material was stored in the Herbarium of the Institute of Botany (SOM).

Research paper thumbnail of Cardamine ×rhodopaea (Brassicaceae), a triploid hybrid from the West Rhodope Mts: Morphology, distribution, relationships and origin

Phytologia Balcanica International Journal of Balkan Flora and Vegetation, 2013

Research paper thumbnail of Plantago sempervirens (Plantaginaceae): a dwarf shrub new for the bulgarian flora

Phytologia Balcanica International Journal of Balkan Flora and Vegetation, 2011

Plantago sempervirens is reported for the first time for the Bulgarian flora. It was found near t... more 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 dispersal modes of this species. The determined chromosome number is 2n = 12.

Research paper thumbnail of Ambrosia Trifida (Asteraceae ), a New Non-Native Species for the Bulgarian Flora

Comptes rendus de l'Académie bulgare des sciences: sciences mathématiques et naturelles

ABSTRACT

Research paper thumbnail of Lycopodiella inundata (L.) Holub, Drosera rotundifolia L. - In: Vladimirov, V. & al. (comps), New floristic records in the Balkans: 22. Reports 77-78

Research paper thumbnail of A new annual Bupleurum (Apiaceae) species from Northeastern Bulgaria and Romanian Dobrogea

Phytol. Balcan, 2010

Abstract. Bupleurum uechtritzianum from NE Bulgaria and N Dobrogea (Romania) is described as a sp... more Abstract. 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. ...

Research paper thumbnail of Red list of Bulgarian vascular plants

Phytologia Balcanica, 2009

Research paper thumbnail of A New Species of Cyanus (Asteraceae, Centaureinae) from Southeastern Bulgaria

Novon: A Journal for Botanical Nomenclature, 2009

Abstract A new species of Cyanus Miller, C. diospolitanus Bancheva & S. Stoyanov ... more Abstract 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. ...

Research paper thumbnail of Sisyrinchium rosulatum (Iridaceae), a new alien species to the Bulgarian flora

Research paper thumbnail of A new species record of Tragopogon (Asteraceae) for the Bulgarian flora

Phytologia Balcanica: International Journal of Balkan Flora and Vegetation, Dec 15, 2022

Research paper thumbnail of Systematical and phytogeographical analysis of the flora on Mt Golo Bardo

bio.bas.bg

Abstract. The article presents the contemporary status of the flora and the phytogeographical cha... more Abstract. 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 ...

Research paper thumbnail of The pink flowering Crepis rubra (Asteraceae) - new for the Bulgarian flora

Crepis rubra is reported for the first time for the Bulgarian flora. The species was discovered n... more Crepis rubra is reported for the first time for the Bulgarian flora. The species was discovered near Madzharovo town, in the floristic region of the Eastern Rhodopi Mts. The article contains information about its morphology, general distribution, habitat, and population.

Research paper thumbnail of Plantago sempervirens (Plantaginaceae): a dwarf shrub new for the Bulgarian flora

Plantago sempervirens is reported for the first time for the Bulgarian flora. It was found near t... more 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 dispersal modes of this species. The determined chromosome number is 2n = 12.

Research paper thumbnail of Taxonomic redefinition of Bupleurum pauciradiatum and B. wolffianum (Apiaceae)

Phytotaxa, 2018

Bupleurum pauciradiatum is recorded for the first time in the Balkans. It was discovered in the K... more 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 for B. wolffianum. Bupleurum wolffianum is found conspecific with B. leptocladum, and the latter is reduced into synonymy. The records of B. pauciradiatum in the Crimea belong to B. asperuloides.

Research paper thumbnail of On the distribution of Helichrysum arenarium (l.) Moench (Asreraceae) in Bulgaria

ARPHA Conference Abstracts, 2019

Helichrysum arenarium (L.) Moench is herbaceous perennial plant belonging to Asteraceae family. T... more Helichrysum arenarium (L.) Moench is herbaceous perennial plant belonging to Asteraceae family. The plant is well known in phytotherapy for its potential in the treatment of gallbladder disease and is classified as endangered in a number of European countries. In Bulgaria it is a protected species according to the Biodiversity Act (Annex 4) and is in the List of Species of Medicinal Plants under special regimen of conservation and use. The data on the distribution of H. arenarium in the Bulgarian flora have not been updated for more than 20 years. The aim of this study is to determine the current distribution of H. arenarium in Bulgaria on the basis of reviewing the available herbarium specimens in the Bulgarian herbariums, literature data, and personal collections. As a result, the locations of the species on the territory of the country were described and mapped. In Bulgaria H. arenarium is represented with only a few populations located in a limited area in the northeastern part ...

Research paper thumbnail of Contribution to the taxonomy and distribution of Bupleurum boissieri, B. aequiradiatum and B. gerardi (Apiaceae) in the Balkans

Phytotaxa, 2019

Bupleurum uechtritzianum, recently described from Bulgaria, is synonymized with B. boissieri. Bup... more 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 for the first time, and is excluded from Albania and Croatia. Bupleurum gerardi does not occur in the Balkans and its records in Bulgaria belong to B. commutatum. The lectotype of B. aequiradiatum is also designated here. A dichotomous key to the Balkan representatives of Bupleurum section Juncea and close-up photographs of their diagnostic characters are provided.

Research paper thumbnail of A new perennial Bupleurum species for the Bulgarian flora

During the investigation of the flora of Mt Vitosha in 2003 a new native species Bupleurum ranunc... more During the investigation of the flora of Mt Vitosha in 2003 a new native species Bupleurum ranunculoides L. for Bulgarian flora was found. The material was stored in the Herbarium of the Institute of Botany (SOM).

Research paper thumbnail of Cardamine ×rhodopaea (Brassicaceae), a triploid hybrid from the West Rhodope Mts: Morphology, distribution, relationships and origin

Phytologia Balcanica International Journal of Balkan Flora and Vegetation, 2013

Research paper thumbnail of Plantago sempervirens (Plantaginaceae): a dwarf shrub new for the bulgarian flora

Phytologia Balcanica International Journal of Balkan Flora and Vegetation, 2011

Plantago sempervirens is reported for the first time for the Bulgarian flora. It was found near t... more 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 dispersal modes of this species. The determined chromosome number is 2n = 12.

Research paper thumbnail of Ambrosia Trifida (Asteraceae ), a New Non-Native Species for the Bulgarian Flora

Comptes rendus de l'Académie bulgare des sciences: sciences mathématiques et naturelles

ABSTRACT

Research paper thumbnail of Lycopodiella inundata (L.) Holub, Drosera rotundifolia L. - In: Vladimirov, V. & al. (comps), New floristic records in the Balkans: 22. Reports 77-78

Research paper thumbnail of A new annual Bupleurum (Apiaceae) species from Northeastern Bulgaria and Romanian Dobrogea

Phytol. Balcan, 2010

Abstract. Bupleurum uechtritzianum from NE Bulgaria and N Dobrogea (Romania) is described as a sp... more Abstract. 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. ...

Research paper thumbnail of Red list of Bulgarian vascular plants

Phytologia Balcanica, 2009

Research paper thumbnail of A New Species of Cyanus (Asteraceae, Centaureinae) from Southeastern Bulgaria

Novon: A Journal for Botanical Nomenclature, 2009

Abstract A new species of Cyanus Miller, C. diospolitanus Bancheva & S. Stoyanov ... more Abstract 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. ...