Search results for "flores"

A new species of Agrostis (Gramineae) in the A. alpina complex

2000

Abstract A new species of Agrostis L. ( A. barceloi ) is described from the northern mountains of Mallorca (Balearic Islands). The new taxon belongs to sect. Agrostis and is mainly related to A. alpina Scop. and A. schleicheri Jord. & Verl. on morphological grounds. However, A. barceloi differs from A. alpina by its narrowly-lanceolate inflorescence, with panicle branches erect during and after anthesis, non-scabrid leaves, and by smaller lemmas and others. The new species is distinguished from A. schleicheri by the smaller spikelets, lemma, palea, and anthers. In addition, A. barceloi is tetraploid (2 n =28), and differs cytologically from the diploid A. alpina (2 n =14) and the hexaploid …

Functional implications of the staminal lever mechanism in Salvia cyclostegia (Lamiaceae)

2011

Flower morphology and inflorescence architecture affect pollinator foraging behaviour and thereby influence the process of pollination and the reproductive success of plants. This study explored possible ecological functions of the lever-like stamens and the floral design in Salvia cyclostegia.Flower construction was experimentally manipulated by removing either the lower lever arms or the upper fertile thecae of the two stamens from a flower. The two types of manipulated individuals were intermixed with the control ones and randomly distributed in the population.Removing the sterile lower lever arms significantly reduced handling time per flower of the main pollinator, Bombus personatus. I…

Typology of inflorescences

1965

Manufacturas sederas en la Europa ilustrada: el caso de Lyon y Valencia. Posibilidades para su estudio mediante inteligencia artificial

2021

El modelo ilustrado francés fue adaptado en la corte española como mecanismo a través del que fomentar los talleres nacionales y generar nuevas manufacturas. Ello supuso la creación de la Real Fábrica de la Seda de los Cinco Gremios de Madrid en Valencia y la creación de la Escuela de Flores y Ornatos de la Academia de Bellas Artes de San Carlos, por Real Orden del 24 de octubre de 1778, con el fin de formar a artistas en el estudio de flores y ornatos para su aplicación al textil. La aplicación de medios informáticos, que propone el proyecto SILKNOW, al estudio de estos repertorios decorativos permite una nueva mirada sobre la relación entre los modelos franceses y las traslaciones valenci…

La pintura de flores de Miguel Parra (1780-1846)

2013

Although Miguel Parra Abril (Valencia, 1780-Madrid, 1846) is one of the most important Valencian School painters of floral still lifes, this aspect of his work remains little known. The present article addresses this oversight in two ways. First, by offering an overview of his oeuvre as a painter of floral subjects from his student days at the Fine Arts Academy of Valencia through his mature works. Second, by analyzing two heretofore-unpublished floral compositions in relation to his more familiar works, particularly those located in private collections until recent years.Aunque Miguel Parra Abril (Valencia, 1780-Madrid, 1846) es uno de los pintores de flores más importantes de la Escuela v…

Gestion des microflores bactériennes telluriques bénéfiques et indésirables dans le cadre d'une agriculture durable

2007

Diplôme : HDR

Sex ratio and spatial distribution of male and female Antennaria dioica (Asteraceae) plants

2011

Sex ratio, sex spatial distribution and sexual dimorphism in reproduction and arbuscular mycorrhizal colonisation were investigated in the dioecious clonal plant Antennaria dioica (Asteraceae). Plants were monitored for five consecutive years in six study plots in Oulanka, northern Finland. Sex ratio, spatial distribution of sexes, flowering frequency, number of floral shoots and the number and weight of inflorescences were recorded. In addition, intensity of mycorrhizal fungi in the roots was assessed. Both sexes flowered each year with a similar frequency, but the overall genet sex ratio was strongly female-biased. The bivariate Ripley’s analysis of the sex distribution showed that within…

Ucriol, an epoxy-diterpene from Sideritis syriaca

1983

Abstract The isolation of a new epoxy-diterpene from the inflorescence of Sideritis syriaca (S. sicula Ucria) is described. Its structure and stereochemistry were established by spectroscopy and partial synthesis.

The pollination syndrome ofDeplanchea tetraphylla (Bignoniaceae)

1986

The reproductive structures ofDeplanchea tetraphylla (Bignoniaceae) exhibit a significant number of unusual features: inflorescence with an apical “platform”; flowers yellow, short-tubed, strongly zygomorphic; mouth closed through lateral compression; stamens and style long-exserted, erect or slightly reclined; nectar dark brown, exposed in the spoon-shaped lowermost corolla lobe and apparently acting also as a visual cue. These features suggest a highly elaborate syndrome for bird pollination: the birds (probably lorikeets) perch on the inflorescence platform and bend downwards to take up the exposed nectar, thus touching the exserted anthers and stigmas with the throat or breast. The like…

Physiological and reproductive differences between hermaphrodites and males in the androdioecious plant Fraxinus ornus

2004

8 páginas, 4 figuras, 1 tabla.