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Grande Allende J.R.,Central University of Venezuela | Grande Allende J.R.,Fundacion Instituto Botanico Of Venezuela | Meier W.,Fundacion Instituto Botanico Of Venezuela | Meier W.,Albert Ludwigs University of Freiburg | Rivero R.,Central University of Venezuela
Brittonia | Year: 2011

Ipomoea yaracuyensis (Convolvulaceae: Convolvuloideae: Ipomoeae) is described and illustrated by materials from cloud forests of the Sierra de Aroa and the Macizo de Nirgua of the Coastal Cordillera of Venezuela. This new species can easily be distinguished from other related species by the presence of few-flowered cymes supported by relatively short and arched peduncles, relatively large (2. 3-3. 1 cm long), subcoriaceous and apiculate sepals, and a yellow corolla ca. 7 cm long. A description of the pollen is also included. © 2011 The New York Botanical Garden.

Michelangeli F.A.,New York Botanical Garden | Meier W.,Fundacion Instituto Botanico Of Venezuela | Meier W.,Albert Ludwigs University of Freiburg
Phytotaxa | Year: 2013

Miconia longidentata, a new species of Melastomataceae, Miconieae, from the Coastal Cordillera in northern Venezuela is described. This species is known from cloud and mid elevation forests in the Waraira Repano National Park (formerly known as Ávila National Park). Miconia longidentata is characterized by sessile to sub-sessile, dimorphic leaves, short axillary inflorescences, and four-merous flowers with long calyx teeth. By its character combination Miconia longidentata would have been described as Clidemia, but it is here described in Miconia due to ongoing taxonomic realignments in the Miconieae. The new species is compared to putative relatives, and a list of anisophyllous species traditionally placed in Clidemia is provided. A list of species of Melastomataceae endemic to the Coastal Cordillera in northern Venezuela is also included. © 2013 Magnolia Press.

Allende J.R.G.,Central University of Venezuela | Allende J.R.G.,Fundacion Instituto Botanico Of Venezuela | Meier W.,Fundacion Instituto Botanico Of Venezuela | Meier W.,Albert Ludwigs University of Freiburg
Candollea | Year: 2012

Two new species of Centropogon C. Presl (Campanulaceae) from northeastern Venezuela, Centropogon carupanensis J. R. Grande & W. Meier and Centropogon pataensis J. R. Grande & W. Meier, are described and illustrated. Centropogon carupanensis presents most morphological similarities with Centropogon berteroanus (Spreng.) DC. (a species from the Lesser Antilles), as Centropogon pataensis with Centropogon monagensis McVaugh (from the Caripe mountains from northeastern Venezuela). These four species show great similarity with Centropogon roraimanus E. Wimm., a species from the Guayana shield that can be attributed to the same group within subsect. Colombiani McVaugh. A synopsis of subsect. Colombian, including a key to distinguish these five taxa, with some notes on the biogeography, ecology and conservation status of the mountain ecosystems of Paria peninsula, are also given. © CONSERVATOIRE ET JARDIN BOTANIQUES DE GENÈVE 2012.

Vivas Y.,Fundacion Instituto Botanico Of Venezuela | Ubiergo P.,Fundacion Instituto Botanico Of Venezuela
Revista de la Facultad de Agronomia | Year: 2010

Taking into account the importance of the Asteraceae family in moorland, the diversity of species was studied in the area occupied by the Valley of the "Morrenic" Complex in "Mucubají", with the purpose of contributing to knowledge, and promotion moorland floral resources conservation in Venezuela. The traditional methodology for floral studies was used, monthly collecting Asteraceae specimens during a year and a half, that resulted in the collection and identification of 20 species, included in fifteen genus, belonging to five tribes. A key is presented for the identification of the present species in the area occupied by the "Morrenic" alley of "Mucubají", as well as the listing of the same with general information. The genre with greater diversity was Gnaphalium representing 15% of the total reported, followed by Pentacalia with 10%, while the rest only showed one specie.

A characterization of the morphology of 18 species and seven varieties of the genus Calliandra from Venezuela was carried out in order to establish similarities and differences that could be used as taxonomic characters. The material was processed for study under the stereoscope microscope. The presence or absence of pleurogram as well as shape, size and color of the seed were found to be of the greatest taxonomic value. The seeds of each species are described and illustrated and a key for the identification of species using seed characters is presented.

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