Bradleya最新文献

{"title":"A new species of Cumulopuntia (Cactaceae) from Peru","authors":"P. Hoxey, G. A. PAUCA TANCO, Víctor Quipuscoa Silvestre, Andrew Gdaniec","doi":"10.25223/brad.n41.2023.a8","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a8","url":null,"abstract":"Summary: A new species of Cumulopuntia (C. mollispina) is described and illustrated. The species is a narrow endemic from the Valley of the Rio Yauca, in the Department of Ayacucho near the frontier with the Department of Arequipa. It is known only from a small geographical area with a narrow elevation range of 1,700–1,800m. It is a member of the informal ‘Cumulopuntia sphaerica’ clade (=Sphaeropuntia Guiggi) but differs from all other members by growing as a hemispherical or slightly flattened cushion of tightly packed segments with soft flexible spination. We compare the new taxon with three other Cumulopuntia species: C. leucophaea, C. multiareolata and C. zehnderi, which all grow within 60km of C. mollispina. Zusammenfassung: Eine neue Cumulopuntia-Art, C. mollispina, wird beschrieben und abgebildet. Die Art ist ein enger Endemit aus dem Tal des Rio Yauca im Departamento Ayacucho nahe der Grenze zum Departamento Arequipa. Sie ist nur aus einem kleinen geografischen Gebiet mit einem schmalen Höhenbereich von 1700 bis 1800m bekannt. Sie gehört zur informellen Cumulopuntia sphaericaKlade (=Sphaeropuntia Guiggi), unterscheidet sich aber von allen anderen Vertretern durch ihren halbkugelförmigen oder leicht abgeflachten Polsterwuchs aus dicht gepackten Segmenten mit weicher, flexibler Bedornung. Wir vergleichen das neue Taxon mit drei anderen Cumulopuntia-Arten, C. leucophaea, C. multiareolata und C. zehnderi, die alle im Umkreis von 60km von C. mollispina wachsen.","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46902171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bulbine vandermerwei, a new species (Asphodelaceae) from the Western Cape","authors":"E. V. VAN JAARSVELD, A. L. Roux","doi":"10.25223/brad.n41.2023.a15","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a15","url":null,"abstract":"Summary: Bulbine vandermerwei(Asphodelaceae), a geophyte endemic to aeolian sand deposits south-east of Worcester (Western Cape), South Africa, is described. The tubers proliferate forming dense clusters bearing ascending somewhat dorsiventrally glaucous flattened leaves. The description of this taxon forms part of an ecological research project of the Worcester Robertson region (Western Cape) by one of us (A. le Roux). Zusammenfassung: Bulbine vandermerwei (Asphodelaceae), ein Geophyt, der in äolischen Sandablagerungen südöstlich von Worcester (Western Cape), Südafrika, endemisch ist, wird beschrieben. Die Knollen teilen sich und bilden dichte Gruppen, die aufsteigende, dorsiventral etwas abgeflachte, glauke Blätter tragen. Die Beschreibung dieses Taxons ist Teil eines ökologischen Forschungsprojekts der Region Worcester Robertson (Western Cape) durch einen von uns (A. le Roux).","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46443941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interpopulational seed hydration memory does not affect seed germination of Xiquexique gounellei (F.A.C.Weber ex K.Schum) Lavor & Calvente subsp. gounellei (Cactaceae) under water deficit","authors":"Bruno de Santana Santos, A. T. Lima, M. Meiado","doi":"10.25223/brad.n41.2023.a6","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a6","url":null,"abstract":"Summary: The passage of seeds through hydration and dehydration cycles (HD cycles) can be essential for the acquisition of tolerance and survival to abiotic stress conditions. Since seeds of species from semi-arid ecosystems naturally undergo discontinuous hydration when they germinate, the aim of this study was to compare the seed germination of Xiquexique gounellei subsp. gounellei (Cactaceae) from different populations growing in the Caatinga, a Tropical Dry Forest in Northeastern Brazil, submitted to water deficit after HD cycles. We collected seeds from two populations growing in the municipalities of Canindé de São Francisco and Sousa. We subjected the seeds to 0, 1, 2 and 3 HD cycles and placed them to germinate at osmotic potentials 0.0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa. From the results of this study, we observed that the two populations do not respond significantly to HD cycles, however the population of Canindé de São Francisco showed a higher germinability in a shorter period, as well as a higher germination speed. Although the two populations grow in the same ecosystem, we observed different germinative behaviour between the populations. Differences in seed germination from the two populations may be related to the phenotypic plasticity of the species influenced by genotypic variation and differences in seasonality and microhabitat conditions in which the populations are growing. Zusammenfassung: Das Durchlaufen von Samen durch Hydratations- und Dehydratationszyklen (HD-Zyklen) kann für den Erwerb von Toleranz gegenüber abiotischen Stressbedingungen und das Überleben erforderlich sein. Da Samen von Arten aus semi-ariden Ökosystemen bei der Keimung auf natürliche Weise einer diskontinuierlichen Hydration unterliegen, war es das Ziel dieser Studie, die Keimung der einem nach HD-Zyklen entstandenen Wasserdefizit ausgesetzten Samen von Xiquexique gounellei subsp. gounellei (Cactaceae) aus verschiedenen in der Caatinga, einem tropischen Trockenwald Nordostbrasiliens, wachsenden Populationen zu vergleichen. Wir sammelten Samen von zwei Populationen in den Gemeinden Canindé de São Francisco und Sousa. Wir setzten die Samen 0, 1, 2 und 3 HD-Zyklen aus und legten sie bei osmotischen Potentialen von 0.0, –0.2, –0.4, –0,6, –0.8 und –1.0 Mpa zur Keimung aus. Als Ergebnisse dieser Studie sahen wir, dass die beiden Populationen nicht signifikant auf HD-Zyklen reagieren, wenn auch die Population von Canindé de São Francisco eine höhere Keimrate in kürzerer Zeit sowie eine höhere Keimgeschwindigkeit zeigte. Obwohl die beiden Populationen im selben Ökosystem wachsen, beobachteten wir Unterschiede in ihrem Keimverhalten. Die unterschiedliche Samenkeimung der beiden Populationen kann mit der phänotypischen Plastizität der Arten zusammenhängen, die durch genotypische Variation sowie Unterschiede in der Saisonalität und den Mikrostandortbedingungen, unter denen die Populationen wachsen, beeinflusst wird.","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45791886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A taxonomic revision of the genus Leptocereus (Cactaceae) in Haiti and the Dominican Republic","authors":"P. Hoxey, Andrew Gdaniec, José Dolores Hernández, Mario Guzmán, Wilmer Corniel, A. Culham","doi":"10.25223/brad.n41.2023.a3","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a3","url":null,"abstract":"Summary: Until recently the genus Leptocereus (Cactaceae) had been little studied on Hispaniola, an island in the Caribbean shared between Haiti and the Dominican Republic. For many years only three endemic species were accepted as being present: Leptocereus paniculatus (≡Neoabbottia paniculata), L. undulosus (≡Dendrocereus undulosus) and L. weingartianus. The identity of L. weingartianus is obscure and the type material is a seedling plant, originating from seed collected in Haiti, showing juvenile characters and lacking flowers or fruits. For many years this name was applied to all Leptocereus on the island of Hispaniola excluding L. paniculatus and L. undulosus, although two recently published species (L. demissus and L. velozianus) have been segregated from it. We propose that the likely identity of the type material of L. weingartianus is a seedling of L. paniculatus but due to the designation of an epitype we retain the name for a thin stemmed species found in south-central Hispaniola. Based on fieldwork in Haiti and the Dominican Republic supplemented with analyses of seed and seedling morphology at Gibraltar Botanic Gardens, we recognise nine species, all endemic to Hispaniola, including four which are described here for the first time (L. rosei sp. nov., L. bayahibensis sp. nov., L. cremnophilus sp. nov., and L. septentrionalis sp. nov.). We provide a key to the species and, for all taxa, we supply a description, distribution map, iconography, list of specimens studied and photographic plates. We also propose three subgenera for Leptocereus (subgenus Leptocereus, subgenus Dendrocereus, and subgenus Neoabbottia), the latter two based on genera of the same names. All species from Hispaniola belong to Leptocereus subgenus Neoabbottia except for L. undulosus, which is a member of Leptocereus subgenus Dendrocereus. Zusammenfassung: Bis vor kurzem war die Gattung Leptocereus (Cactaceae) auf Hispaniola, einer Insel in der Karibik, die von Haiti und der Dominikanischen Republik geteilt wird, kaum untersucht. Viele Jahre lang wurden nur drei endemische Arten als dort vorkommend akzeptiert: Leptocereus paniculatus (≡Neoabbottia paniculata), L. undulosus (≡Dendrocereus undulosus) und L. weingartianus. Die Identität von L. weingartianus ist unklar und das Typusmaterial ist eine Sämlingspflanze, die aus in Haiti gesammelten Samen stammt, juvenile Merkmale zeigt und keine Blüten oder Früchte hat. Viele Jahre lang wurde dieser Name auf alle Leptocereen Hispaniolas angewendet, mit Ausnahme von L. paniculatus und L. undulosus, obwohl zwei kürzlich veröffentlichte Arten (L. demissus und L. velozianus) davon abgetrennt wurden. Wir meinen, dass die wahrscheinliche Identität des Typusmaterials von L. weingartianus auf einem Sämling von L. paniculatus beruht, aber aufgrund der Festlegung eines Epitypus behalten wir den Namen für eine dünntriebige Art bei, die im südlich-zentralen Teil von Hispaniola zu finden ist. Basierend auf Feldforschungen in Haiti und de","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43483965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diversity in pollen structure in the dwarf succulent genus Conophytum N.E.Br. (Aizoaceae)","authors":"A. Young","doi":"10.25223/brad.n41.2023.a9","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a9","url":null,"abstract":"Summary: Exine structure and ornamentation of pollen of 161 species and subspecies of the dwarf succulent genus Conophytum N.E.Br. has been examined using scanning electron microscopy. Exine structure varies across the genus including tectate-imperforate and, more rarely, intectate forms. In addition, the density and size of microechini varies considerably. The sunken colpi are often heavily ornamented with microechini. This diversity in structure was used to define six types of pollen, four of which accounted for 97% of all Conophytum taxa. The pollen of all nocturnal flowering taxa (accounting for 26% of species and subspecies) share a common structure that differs from that seen in the diurnal-flowering taxa, which is more varied. The possible evolutionary significance of pollen structure is discussed. Zusammenfassung: Die Struktur und die Skulptur der Pollen von 161 Arten und Unterarten der Zwergsukkulentengattung Conophytum N. E. Br. wurden rasterelektronenmikroskopisch untersucht. Die Struktur der Pollen variiert innerhalb der Gattung und umfasst tectate, nicht perforierte und, seltener, Formen ohne Tectum. Außerdem variiert die Dichte und Größe der Mikrostacheln erheblich. Die vertieften Keimöffnungen sind oft stark mit Mikrostacheln verziert. Diese Strukturvielfalt wurde genutzt, um sechs Pollentypen zu definieren, von denen vier für 97 % aller Conophytum-Taxa stehen. Die Pollen aller nächtlich blühenden Taxa (die 26 % der Arten und Unterarten ausmachen) weisen eine gemeinsame Struktur auf, die sich von der stärker variierenden Struktur der tagsüber blühenden Taxa unterscheidet. Die mögliche evolutionäre Bedeutung der Pollenstruktur wird diskutiert.","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45476571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Drosanthemum floribundum (Haw.) Schwantes: first record as a naturalised species in Algeria","authors":"Nora Sakhraoui, Hicham Boughendjioua, Gideon F. Smith, F. Essl","doi":"10.25223/brad.n41.2023.a17","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a17","url":null,"abstract":"Summary: Drosanthemum floribundum (Haw.) Schwantes, a South African endemic, is here recorded as an alien species from a coastal cliff in the Skikda region of north-eastern Algeria. The population consists of several dozen hanging tufts spread over an area of about one hundred square metres. This is the first record of the species from Algeria and the second from continental North Africa. The site is exposed to sea spray and dominated by indigenous herbaceous plants. Given the substantial size of the population and observed vegetative spread, we consider D. floribundum to be naturalised at the reported site. Accordingly, D. floribundum should be added to the list of alien species established in Algeria. This is the fourth alien species of Aizoaceae in Algeria, in addition to Aptenia cordifolia, Carpobrotus edulis, and C. acinaciformis. Zusammenfassung: Drosanthemum floribundum (Haw.) Schwantes, ein südafrikanischer Endemit, wird hier als gebietsfremde Art von einem Küstenkliff in der Region Skikda im Nordosten Algeriens beschrieben. Die Population besteht aus mehreren Dutzend hängenden Büscheln, die sich über eine Fläche von ca. 100 m2 verteilen. Dies ist der erste Nachweis der Art in Algerien und der zweite auf dem nordafrikanischen Festland. Der Wuchsort ist der Meeresgischt ausgesetzt und wird von einheimischen krautigen Pflanzen dominiert. Aufgrund der beträchtlichen Größe der Population und der beobachteten vegetativen Ausbreitung gehen wir davon aus, dass D. floribundum an dem gemeldeten Wuchsort eingebürgert ist. Dementsprechend sollte D. floribundum in die Liste der in Algerien. Dies ist neben Aptenia cordifolia, Carpobrotus edulis und C. acinaciformis die vierte gebietsfremde Art der Aizoaceae in Algerien.","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48888391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bulbine gondwanae N.H.G.Jacobsen & K.J.Koen. A new fynbos species (Asphodelaceae) from the Gondwana Game Reserve, Mossel Bay, Western Cape, South Africa","authors":"N. Jacobsen, K. J. Koen","doi":"10.25223/brad.n41.2023.a11","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a11","url":null,"abstract":"Summary: A new sweet-scented Bulbine species, B. gondwanae N.H.G.Jacobsen & K.J.Koen is described from the Gondwana Game Reserve near Mossel Bay in the Western Cape occurring in near sympatry with the similar B. lagopus (Thunb.) N.E.Br. A morphological comparison indicates that the new species differs from the latter despite both species growing in fynbos vegetation but differs in habitat and appears to have different flowering times. An assessment of posts on iNaturalist of both B. lagopus and B. abyssinica in order to locate possible misidentified plants of the novelty beyond the borders of the Game Reserve, failed. Zusammenfassung: Eine neue, süß duftende Bulbine-Art, B. gondwanae N.H.G.Jacobsen & K.J.Koen, die nahezu sympatrisch mit der ähnlichen B. lagopus (Thunb.) N. E. Br. vorkommt, wird aus dem Gondwana-Wildreservat in der Nähe von Mossel Bay im Westkap beschrieben. Ein morphologischer Vergleich zeigt, dass die neue Art von der letzteren unterschieden ist, und obwohl beide Arten in der Fynbos-Vegetation wachsen, unterscheiden sie sich durch ihre Lebensräume und anscheinend unterschiedliche Blühzeiten. Eine Auswertung der iNaturalistEinträge zu B. lagopus und B. abyssinica, um möglicherweise falsch bestimmte Pflanzen der Neuheit jenseits der Grenzen des Wildreservats ausfindig zu machen, schlug fehl.","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45078396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aloe maculata All. (Asphodelaceae subfam. Alooideae): a new addition to the alien flora of Algeria and North Africa","authors":"Nora Sakhraoui, F. Verloove, Gideon F. Smith","doi":"10.25223/brad.n41.2023.a16","DOIUrl":"https://doi.org/10.25223/brad.n41.2023.a16","url":null,"abstract":"Summary: Aloe maculata All. (Asphodelaceae subfam. Alooideae) is reported for the first time as naturalised in Algeria. This also represents the first record of this species for continental North Africa. Aloe maculata was found to have escaped from cultivation in the Skikda region in northeastern Algeria where this species has become established in three locations. Detailed information on the habitats colonised is presented. The reproductive modes and the extent of naturalisation of the species are recorded. Zusammenfassung: Aloe maculata All. (Asphodelaceae subfam. Alooideae) wird erstmals als in Algerien eingebürgert gemeldet. Dies ist auch der erste Nachweis dieser Art für das nordafrikanische Festland. Es wurde festgestellt, dass Aloe maculata aus Kultur in der Region Skikda im Nordosten Algeriens entwichen ist und sich dort an drei Stellen etabliert hat. Detaillierte Informationen über die besiedelten Lebensräume werden präsentiert. Die Vermehrungsmodi und das Ausmaß der Einbürgerung der Art werden dokumentiert.","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45182655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cultivation as a conservation tool for cacti: review of the botanical evidence and a case study of Lophophora williamsii","authors":"A. Ermakova, M. Terry, K. Trout","doi":"10.25223/brad.sp40.2022.a8","DOIUrl":"https://doi.org/10.25223/brad.sp40.2022.a8","url":null,"abstract":"Summary: In this article we review the literature, with a focus on cacti, about the role of cultivation in conservation. We examine in detail the case study of Lophophora williamsii, the peyote cactus, and present arguments that cultivation is not only a necessary conservation strategy for this particular species but is likely the only viable alternative for long-term survival of this cactus in the wild. Concerns about cultivation, as well as recommendations and conservation implications are also discussed.","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45189817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BCSS Research Grants – Instructions for applicants","authors":"","doi":"10.25223/brad.n40.2022.a21","DOIUrl":"https://doi.org/10.25223/brad.n40.2022.a21","url":null,"abstract":"","PeriodicalId":50726,"journal":{"name":"Bradleya","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42473688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}