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| Abreu,Maria Carolina de; Carvalho,Reginaldo de; Sales,Margareth Ferreira de. |
| Este estudo foi baseado na análise morfológica de material herborizado e observação dos espécimes em seu habitat natural. Foram registradas nove espécies diferenciadas, principalmente, pelo sistema caulinar, filotaxia, tipo de folha, cor das flores, tipologia das inflorescências e morfologia das cápsulas. Destas espécies, duas (Oxalis corniculata L. e O. cratensis Oliver ex Hooker) possuem distribuição preferencial nas zonas do Litoral e Mata até a subzona do Agreste. Oxalis psoraleoides Kunth apresenta ampla distribuição em todo Estado. Oxalis triangularis A. St.-Hil. e O. frutescens L. distribuem-se desde as zonas do Litoral e Mata até a subzona do Sertão. Oxalis divaricata Mart. ex Zucc. distribui-se nas subzonas do Agreste e Sertão, ocorrendo também no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oxalis; Oxalidaceae; Taxonomia; Pernambuco. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062008000200010 |
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| Rosenfeldt,Sonia; Galati,Beatriz G. |
| Pollen morphology and the degree of pollen variability within nine species and two varieties of Oxalis species from Buenos Aires Province (Argentina) were studied using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Oxalis pollen grain is generally 3-colpate and the shape is prolate spheroidal, oblate spheroidal or spheroidal. The exine is microreticulate. The brochi are circular to polygonal; brochi sizes decrease near the colpi. The colpus membrane observed in unacetolysed material, is crustate or granular. The colpus length varies within a species; the largest grains are produced in stamens with long filaments and the smallest ones in stamens with short filaments. Four pollen types are distinguished... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pollen; Oxalis; Morphology; Structure. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452007000100002 |
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| López,Alicia; Rosenfeldt,Sonia. |
| La morfología del polen y las características de las orbículas fueron estudiadas en todas las especies de Oxalis sección Palmatifoliae, endémica del sur de Sudamérica, empleando microscopio óptico (M.O.) y microscopio electrónico de barrido (M.E.B.). Los granos de polen son 3-colpados, de forma prolato esferoidales, oblato esferoidales o esferoidales. La exina es microrreticulada. Lúmen circular a poligonal; disminuyendo de tamaño hacia los polos. Las orbículas están dispersas irregularmente en la superficie interna de las anteras; son generalmente aplanadas, redondeadas o con forma de “dona”, de superficie lisa. La homogeneidad observada en la morfología de granos de polen de las especies de Oxalis sección Palmatifoliae refuerza la... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Chile; Patagonia; Micromorfología; Oxalis. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722015000300007 |
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| Royo-Esnal,Aritz; López,María Luisa. |
| Oxalis latifolia is a widely distributed weed that mainly affects corn fields, orchards, plant nurseries and gardens. Two forms of the weed have been identified: the common form, with fish-tailed leaflets, bulbils growing on stolons and dark pink flowers, and the Cornwall form, with rounder leaflets, sessile bulbils and whitish-pale pink flowers. In this study, the fresh matter production, expressed as the increase of the bulbs' fresh weight, of both forms was compared during two growing seasons in two locations. The bulbs were grown in pots from spring to autumn, and different aspects of growth were measured at the end of each season. The total fresh matter production, weight of the apical bulb, total weight of the lateral bulbs and number of lateral... |
| Tipo: Journal article |
Palavras-chave: Bulb; Climate; Oxalis; Soil conditions; Weed. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200007 |
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| Tosto,Daniela; Hopp,Esteban. |
| Oxalis tuberosa is an octoploid Andean tuber crop called "oca" that belongs to the worldwide distributed genus Oxalis. The genus is very heterogeneous and its systematics is still problematic. It has been proposed that O. tuberosa evolved by polyploidization of a still not defined ancestor that belongs to an alliance of species sharing the same basic chromosome number (x = 8). Nuclear rDNA units of O. tuberosa and a selected group of four related diploid species were characterised by RFLP using different restriction endonucleases and southern hybridization probes to produce a restriction map for EcoRI and BamHI. The major rDNA unit length in O. tuberosa was estimated at 10.7 kbp. As expected, restriction site variation was observed mainly in the intergenic... |
| Tipo: Journal article |
Palavras-chave: Andean crops; Oca; Oxalis; RDNA; RFLPs. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300002 |
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| Roets, F.; Oberlander, K.C.; Dreyer, L.L.. |
| The genus Oxalis in southern Africa contains more than 200 species, with the vast bulk of species in the Greater Cape Floristic Region (GCFR). Recent fieldwork has suggested that many await discovery. Here we investigate the identity of two apparently undescribed Oxalis species from Northern Cape, South Africa, using morphological comparisons with closely related taxa. We provide a preliminary phylogenetic placement using DNA sequence-based analyses of the Internal Transcribed Spacer (ITS) region. Both putative new species are distinguished from all known Oxalis species based on macro-morphological traits. Molecular data placed both within a clade consisting of the weedy O. pes-caprae and its close relatives. Oxalis hirsutibulba sp. nov. is characterised by... |
| Tipo: Article / Letter to the editor |
Palavras-chave: New species; Oxalidaceae; Oxalis; Phylogeny; Taxonomy. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/525376 |
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| Roets, F.; Dreyer, L.L.; Wingfield, M.J.; Begerow, D.. |
| The smut genus Thecaphora contains plant parasitic microfungi that typically infect very specific plant organs. In this study, we describe a new species of Thecaphora from Oxalis lanata var. rosea (Oxalidaceae) in the Cape Floristic Region of South Africa. Molecular phylogenetic reconstructions based on large subunit ribosomal DNA sequence data confirmed the generic placement of the fungus and confirmed that it represents an undescribed species for which the name T. capensis sp. nov. is provided. The closest known sister species of the new taxon is T. oxalidis that infects the fruits of Oxalis spp. in Europe, Asia and the Americas. In contrast, T. capensis produces teliospores within the anthers of its host. This is the first documented case of an... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Anther-smut; Cape Floristic Region; Oxalis; Phylogeny; Thecaphora. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/532261 |
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