Search results for "flor"
showing 10 items of 1665 documents
Florintesa: patrimonio floristico e Orti botanici in Italia
2016
Bilabiate Flowers: The Ultimate Response to Bees?
2007
† Background and Aims Bilabiate flowers have evolved in many lineages of the angiosperms, thus representing a convincing example of parallel evolution. Similar to keel blossoms, they have obviously evolved in order to protect pollen against pollen-collecting bees. Although many examples are known, a comprehensive survey on floral diversity and functional constraints of bilabiate flowers is lacking. Here, the concept is widened and described as a general pattern. † Methods The present paper is a conceptional review including personal observations of the authors. To form a survey on the diversity of bilabiate blossoms, a search was made for examples across the angiosperms and these were combi…
The orophilous communities of the Pino-Juniperetea class in the Central and Eastern Mediterranean area
2001
Orophilous plant communities of the Pino-Juniperetea class, occurring in the Central and Eastern Mediterranean area, are examined. This vegetation is characterized by the dominance of trees and shrubs, mostly represented by conifers belonging to the genera Juniperus, Abies and Pinus. These communities are nowadays relegated to the supra- and oromediterranean belt, and show a fragmentary distribution, which is an evident proof of their relict connotation. The comparison among these communities, based on original and literature data, has highlighted a remarkable floristic and structural homogeneity, together with a series of geographical vicariances. From the phytosociological point of view, …
Christian Konrad Sprengel’s Theory of the Flower: The Cradle of Floral Ecology
1996
As the plant taxonomist Karl Suessenguth once wrote, there are two kinds of discoveries: Detecting a thing nobody has seen before, or thinking what no one has thought before about something that everybody sees. A discovery of the second kind, and one of great moments in our science, was Sprengel’s theory of the flower. This theory clearly expressed for the first time the notion that flowers are designed for the transmission of pollen by foreign vectors, that is, animals or wind, and they can be understood only from this perspective.
Effect of pentachlorophenol on predator-prey interaction of two rotifers
1997
Abstract The effect of pentachlorophenol (PCP) on the predator-prey relationship of two rotifers (Asplanchna girodi and Brachionus calyciflorus) was studied using Asplanchna predatory behavior as an endpoint. The experimental design included three treatments: prey and predator exposure, only prey exposure, and only predator exposure. This enabled us to distinguish toxic effects on the predator from those on the prey and to detect interactions. The main toxic effects observed were on the predator and involved the number of predator-prey encounters. Encounters decreased in a dose-dependent manner, with a no observed effect threshold at 0.11 mg PCP l−1. Decrease in encounter rate reduced the n…
Contributo alla conoscenza della distribuzione di Monotropa hypophegea Wallr. (Ericaceae) in Italia
2015
The authors report the distribution of Monotropa hypophegea Wallr. in Italy by the analyses of herbarium specimens, bibliographic references and records in the field. Its national distribution is extended to Tuscany, Marche, Umbria, Puglia Basilicata, Calabria and confirmed for Sicily. Some details concerning morphological characters are also provided to avoid confusion in identification with M. hypopitys L. the other congeneric species occurring in Italy. Furthermore, observations about ecology of these taxa are provided.
The invasion history of Elodea canadensis and E. nuttallii (Hydrocharitaceae) in Italy from herbarium accessions, field records and historical litera…
2022
AbstractWe analysed the invasion history of two North American macrophytes (Elodea canadensis and E. nuttallii) in Italy, through an accurate census of all available herbarium and field records, dating between 1850 and 2019, and a rich literature collection describing the initial introduction and naturalisation phase that supports the results obtained by the occurrence records. Elodea canadensis arrived in Italy before 1866 and had two invasion phases, between the 1890s and 1920s and between the 1990s and 2000s; E. nuttallii, probably arrived in the 1970s, started invading in 2000 and the invasion is still ongoing. Botanical gardens and fish farming played a crucial role in dispersal and na…
The Sicilian wild cabbages as biological resources: taxonomic update and a review on chemical constituents and biological activities
2020
Considering the growing interest that wild brassicas have as sources of bioactive molecules as well as a genetic resource, the authors review and update the taxonomy of Brassica sect. Brassica, limited to the native flora of Sicily, an island considered to be an active diversification center for the group of species of the aforementioned section. Regarding the taxonomic aspects, Brassica tardarae is here considered a subspecies of B. rupestris; the distinction at the subspe- cific level of B. raimondoi, a critical taxon included in B. incana, is also confirmed. In addition, two new subspecies are proposed, respectively in B. incana and B. rupestris. The taxonomic information relating to the…
Typification of the name Senecio pygmaeus (Asteraceae), with some additional taxonomic and phytogeographic remarks
2023
A thorough research on the scientific activity of Guglielmo Gasparrini, Giovanni Gussone and Augustin Pyramus De Candolle allowed the authors to adress a research in several European herbaria looking for the type of the name Senecio pygmaeus DC. The original specimen sent by Gussone and mentioned in the protologue by Candolle is still kept at G-DC and is designated as the lectotype, whilst three other herbarium sheets, preserved at NAP-GUSS, PAL and PAV herbaria respectively, in all probability belong to the same gathering, and are considered as isolectotypes. The authors provide an updated description of this taxon in order to better point out its diagnostic characters. However, further bi…
The Floral Nectaries of the Geraniales and their Systematic Implications.
1992
Summary In the monogeneric family Ctenolophonaceae extrastaminal discs are developed, whose parenchyma and marginally stomata bearing epidermis appear to be adenoid. The discs are extensively vascularized by phloematic branches derived from bundles of the adnate stamens. The flowers are unshowy, simply constructed and without special nectar protecting structures. Pollinators are still unknwon, but nectar-exploiting bees and flies probably predominate. The Ctenolophonaceae are closely connected with Humiriaceae. Presumed affinities with Malpighiaceae are questioned.