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180530s2013 xx |||||o 00| ||eng c |
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|a (JST)43288943
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|c DE-627
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|a eng
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|a de Sequeira, Miguel Menezes
|e verfasserin
|4 aut
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|a Holcus pintodasilvae (Poaceae, Pooideae, Poeae), a New Species from the Island of Madeira (Portugal), and Notes on Macaronesian Holcus
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|c 2013
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|a Text
|b txt
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|a Computermedien
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|a A 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 Höchst, ex Höchst. (Azores Archipelago) and H. mollis L. subsp. hierrensL· 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 (2n = 28). Morphology, ecology, biogeography, and conservation issues are discussed and related to other Macaronesian Holcus taxa. Holcus pintodasilvae was found as only three populations (totaling less than 20 individuals), and its IUCN conservation status is Critically Endangered (CR). A new specific status is proposed for H. mollis subsp. hierrensL·, as H. hierrensL· (Stierst.) Stierst. & M. Seq., based on its chromosome number and morphological identity. Descreve-se urna nova especie, Holcus pintodasilvae M. Seq. & Castrov., pertencente ao género Holcus L. (Poaceae), endémica da Ilha da Madeira (Portugal). Morfologicamente próxima dos endemismos macaronésicos H. rigidus Höchst, ex Höchst. (Arquipélago dos Acores) e H. mollL· L. subsp. hierrensL· Stierst. (Ilha de Hierro, Arquipélago das Canarias) diferencia-se por possuir: nos de coloraçao castanha-clara; folhas com bainhas glabras e láminas subpatentes atenuadas num ápice acuminado; glumas brilhantes, múticas e glabras (excepto ñas nervuras que se apresentam escabriúsculas), gluma superior com as nervuras laterais proximais; lema da flor superior com arista ca. 4 mm (duas vezes o complimento da lema). Incluem-se ainda resultados da contagem de cromossomas de H. pintosilvae (2n = 28). Discutem-se, e relacionam-se com outros taxa Macaronésicos do género Holcus, aspectos relativos à morfologia, ecologia, biogeografia e conservaçao. Holcus pintodasilvae foi encontrado em apenas tres populaçôes (num total de menos de 20 individuos), sendo o seu estado de conservaçao IUCN está criticamente ameaçado (CR). Propoe-se ainda a combinaçao H. hierrensis (Stierst.) Stierst. & M. Seq. baseada na sua identidade morfologica e numero cromossomático.
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|a © Missouri Botanical Garden 2013
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| 650 |
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|a Biological sciences
|x Biology
|x Developmental biology
|x Growth and development
|x Biological development
|x Plant development
|x Plant reproduction
|x Flowers
|x Florets
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| 650 |
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|a Biological sciences
|x Biology
|x Biological taxonomies
|x Taxa
|x New taxa
|x New species
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| 650 |
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|a Biological sciences
|x Biology
|x Botany
|x Plant morphology
|x Plant vegetation
|x Leaves
|x Bracts
|x Glumes
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Biological taxonomies
|x Taxa
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Plants
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Plant anatomy
|x Plant tissues
|x Ground tissue
|x Sclerenchyma
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| 650 |
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|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Landforms
|x Islands
|x Archipelagos
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| 650 |
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|a Biological sciences
|x Biology
|x Genetics
|x Cytogenetics
|x Ploidies
|x Polyploidy
|x Tetraploidy
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| 650 |
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|a Biological sciences
|x Biology
|x Biological taxonomies
|x Holotypes
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|a Business
|x Industry
|x Industrial sectors
|x Manufacturing industries
|x Shipbuilding industry
|x Shipbuilding
|x Keels
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|a research-article
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|a Castroviejo, Santiago
|e verfasserin
|4 aut
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|i Enthalten in
|t Novon
|d Missouri Botanical Garden Press
|g 22(2013), 3, Seite 311-320
|w (DE-627)JST062996134
|x 19456174
|7 nnns
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|g volume:22
|g year:2013
|g number:3
|g pages:311-320
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|u https://www.jstor.org/stable/43288943
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|d 22
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|h 311-320
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