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Holcus pintodasilvae (Poaceae, Pooideae, Poeae), a new species from the Island of Madeira (Portugal), and notes on Macaronesian Holcus

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dc.contributor.authorSequeira, Miguel Menezes de
dc.contributor.authorCastroviejo, Santiago
dc.date.accessioned2022-03-31T11:06:14Z
dc.date.available2022-03-31T11:06:14Z
dc.date.issued2013
dc.description.abstractA new species of Holcus L. (Poaceae), endemic to the island of Madeira (Portugal), is here described as H. pintodasilvae M. Seq. & Castrov. This new species is morphologically closely related to the Macaronesian endemics H. rigidus Hochst. ex Hochst. (Azores Archipelago) and H. mollis L. subsp. hierrensis Stierst. (El Hierro Island, in the Canary Islands) but differs by having the culm nodes light brown, the leaves with a glabrous sheath and subspreading lamina attenuated to an acuminate apex, the glumes blunt, shiny, glabrous (except in the minutely scabrous veins), the upper glume with proximal lateral veins, and the lemma of the upper floret with an awn ca. 4 mm, twice as long as the lemma. Chromosome counts in H. pintodasilvae are tetraploid (2 n = 28). Morphology, ecology, biogeog raphy, and conservation issues are discussed and related to other Macaronesian Holcus taxa. Holcus (totaling less than 20 individuals), and its IUCN conservation status is Critically Endangered (CR). A new specific status is proposed for H. mollis subsp. hierrensis, as H. hierrensis (Stierst.) Stierst. & M. Seq., based on its chromosome number and morphological identity.pt_PT
dc.description.abstractDescreve-se uma nova especie, Holcus pintodasilvae M. Seq. & Castrov., pertencente ao genero Holcus L. (Poaceae), endemica da Ilha da Madeira (Portugal). Morfologicamente proxima dos endemismos macaronesicos H. rigidus Hochst. ex Hochst. (Arquipelago dos Agores) e H. mollis L. subsp. hierrensis Stierst. (Ilha de Hierro, Arquipelago das Canarias) diferencia-se por possuir: nos de ; folhas com bainhas glabras i apice acumi nado; glumas brilhantes, muticas e glabras (excepto nas nervuras que se apresentam escabriusculas), gluma superior com as nervuras laterais proximais; lema da flor superior com arista ca. 4 mm (duas vezes da contagem de cromossomas de H. pintosilvae (2 n = 28). Discutem-se, e relacionam-se com outros taxa Macaronesicos do genero Holcus, aspectos relativos a morfologia, ecologia, biogeografia e conservagao. Holcus pintodasilvae foi encontrado em apenas tres populagoes (num total de menos de 20 indivfduos), sendo o seu estado de conservagao IUCN esta criticamente ameagado (CR). Propoe-se ainda a combinagao H. hierrensis (Stierst.) Stierst. & M.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSequeira, M. M., & Castroviejo, S. (2013). Holcus pintodasilvae (Poaceae, Pooideae, Poeae), a new species from the Island of Madeira (Portugal), and notes on Macaronesian Holcus. Novon: A Journal for Botanical Nomenclature, 22(3), 311-320. https://doi.org/10.3417/2010109pt_PT
dc.identifier.doi10.3417/2010109pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4206
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMissouri Botanical Garden Presspt_PT
dc.relationEvolutionary relationships of Macaronesic Deschampsia Aveneae, Poaceae based on a morphological and molecular approaches.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectGrtamineaept_PT
dc.subjectHolcuspt_PT
dc.subjectIUCNpt_PT
dc.subjectRed Listpt_PT
dc.subjectMacaronesiapt_PT
dc.subjectMadeira (Portugal)pt_PT
dc.subjectPoaceaept_PT
dc.subjectPortugalpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleHolcus pintodasilvae (Poaceae, Pooideae, Poeae), a new species from the Island of Madeira (Portugal), and notes on Macaronesian Holcuspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEvolutionary relationships of Macaronesic Deschampsia Aveneae, Poaceae based on a morphological and molecular approaches.
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCTI%2FBME%2F39640%2F2001/PT
oaire.citation.endPage320pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPage311pt_PT
oaire.citation.titleNovon: A Journal for Botanical Nomenclaturept_PT
oaire.citation.volume22pt_PT
oaire.fundingStreamPOCI
person.familyNameSequeira
person.givenNameMiguel
person.identifier.ciencia-idCA1C-1AC6-6346
person.identifier.orcid0000-0001-9728-465X
person.identifier.scopus-author-id35101791200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscoveryc4c52673-d265-42c0-b5bd-628a3b2f0b0b
relation.isProjectOfPublication583b1936-d26e-402f-8089-e9054a9558bd
relation.isProjectOfPublication.latestForDiscovery583b1936-d26e-402f-8089-e9054a9558bd

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