Botanical novelties from Sierra de Maigualida, southern Venezuela. II

Grande, José R; Kallunki, Jacquelyn A.; Arbo, María Mercedes; Berry, Paul E.; Huber, o Edv Fotowerk; Riina, Ricarda

doi:10.3989/ajbm.2299

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…This is especially true for stems, where pubescence appears broken in mature portions, leaving a rough surface. The bark is partially covered by black piliform fungi, foliose bryophytes, crustose lichens or diminute plants of the family Bromeliaceae Juss., as it is common in the Pantepui area (Steyermark 1988;Grande & al. 2012).…”

Section: Description Of Two New Speciesmentioning

confidence: 99%

Botanical novelties from the Sierra de Maigualida, southern Venezuela III: revision and two new species of the genus <em>Ilex (Aquifoliaceae)</em>

Allende

2019

Anal. Jard. Bot. Madr.

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The Sierra de Maigualida is a poorly explored mountain range in the central Guayana Shield with high levels of endemism. In the present installment, this area is further delimited and mapped, toponymy is reviewed, and the genus Ilex L. is locally reviewed, with two species, namely I. huberi J.R.Grande sp. nov. and I. maigualidensis J.R.Grande sp. nov., described as new to science. Ilex huberi sp. nov. can be distinguished by its leaf blades strongly revolute, mucronate, and with obscure secondary venation, simple dichasia, and depressed-lunate sepals; I. maigualidensis sp. nov. by its dull leaves, flowers with undeveloped styles, and capitate-subcoronate stigmata. Stem buds and cataphylls are proposed as useful characters in species delimitation within the genus, while I. magnifructa Edwin is illustrated for the first time. A key is presented to differentiate all the species of Ilex of the Sierra de Maigualida.

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Section: Description Of Two New Speciesmentioning

confidence: 99%

Botanical novelties from the Sierra de Maigualida, southern Venezuela III: revision and two new species of the genus <em>Ilex (Aquifoliaceae)</em>

Allende

2019

Anal. Jard. Bot. Madr.

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“…), y Turnera con 141 especies en América y dos en África, repartidas en 11 series: Annulares (4), Anomalae (14), Capitatae (10), Conciliatae (1), Leiocarpae (56), Microphyllae (5), Papilliferae (2), Salicifoliae (12), Sessilifoliae (2), Ste-ANA MARIA GONZALEZ Y MARÍA MERCEDES ARBO nodictyae (10), y Turnera, con dos subseries: Turnera (19) y Umbilicatae (8). Turnera y Piriqueta abarcan 80% de las especies de la familia (Arbo 1995(Arbo , 1997(Arbo , 2000(Arbo , 2005(Arbo , 2008Grande et al, 2012).…”

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Morfoanatomía del óvulo y la semilla en Turnera y Piriqueta (Turneraceae)

González

Arbo

2013

Bot. Sci.

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Resumen: Algunos caracteres morfológicos seminales tienen importancia taxonómica y han sido usados para diferenciar géneros y especies en la familia Turneraceae. Sin embargo, su anatomía fue estudiada en pocos taxones. Se analizaron las semillas en los géneros más numerosos de la familia: Piriqueta y Turnera, incluyendo todas las series del último, a fi n de completar la información acerca del desarrollo y variantes de los caracteres morfo-anatómicos. Los objetivos fueron caracterizar y constatar su valor taxonómico. Los óvulos presentan anatomía semejante en todas las especies analizadas. Los tegumentos seminales no son multiplicativos, el externo constituye la testa de la semilla, con dos capas de espesor, y el interno forma el tegmen triestratifi cado. La estructura básica de la cubierta seminal está integrada por aréolas (formadas por células gigantes de la endotesta) limitadas por muros (constituidos por esclereidas del exotegmen), cubiertas por la exotesta, que puede ser lisa o crestada. Algunas especies de Turnera y Piriqueta tienen depresiones punctiformes en las aréolas, solitarias o dobles, determinadas por protrusiones de las cé-lulas endotestales con paredes laberínticas en la cara interna. La cubierta seminal presenta dos tipos básicos: crestado y reticulado con dos subtipos según el desarrollo de los muros. El subtipo reticulado aparece en Piriqueta y varias series de Turnera; el subtipo estriado-reticulado, con muros transversales poco visibles, en especies de algunas series de Turnera. La cubierta seminal crestada, exclusiva de T. sidoides L., se forma cuando las células de la exotesta producen crestas de altura diversa que enmascaran el diseño subyacente. En muchas especies de Piriqueta la exotesta presenta papilas digitifomes, mientras en Turnera aparecen otras papilas. El arilo es hilar en Piriqueta y en la gran mayoría de las especies de Turnera; dos especies de la serie Anomalae y dos de la subserie Umbilicatae presentan arilo ráfi co. El género Turnera incluye el 66% de las especies de la familia, y en concordancia, es el que ofrece mayor diversidad en las semillas. Palabras clave: arilo, cubierta seminal, óvulo, tegmen, testa, Turneraceae.Abstract: Some morphological characters of seeds are important in taxonomy of the Turneraceae family, and have been used to distinguish genera and species. However their anatomy has been studied only in a few species. The seeds of Piriqueta and Turnera, the most numerous genera of the family were analyzed -including all the series of the last one-in order to fulfi ll the information about development and variation of the morph-anatomical characters. The goals were to depict and circumscribe the variants, to check their taxonomic value. The anatomy of ovules is alike in all analyzed species. The integuments are not multiplicative, the outer one makes up the seed testa, with two layers, and the inner integument develops the tegmen with three layers. The seed coat basic structure is composed of areoles (made up by the giant cells of endotesta) delimited by m...

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A Revision of Cuphea section Amazoniana s. s. (Lythraceae)

Graham

2019

Systematic Botany

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Abstract—Cuphea section Amazoniana, one of 13 sections in Cuphea, comprises 20 species, mostly narrow endemics in Colombia, Ecuador, and the Guiana Shield region of Venezuela, Guyana, French Guiana, and Brazil. The species inhabit river margins, tepuis, scrubland, savanna, and low montane forests in tropical to cold temperate climates. They are subshrubs defined by the common presence of a strigose indumentum of bifid (malpighiaceous) trichomes; small elliptic to narrowly lanceolate or linear coriaceous leaves; and tubular flowers to 9 mm long with 11 deeply inserted stamens included in the floral tube. In morphology, they are similar to or partially overlap species currently classified in Cuphea sections Trispermum and Heteranthus. The revision provides a new key, comparative morphological descriptions, first descriptions and illustrations of pollen and seed morphology, and distribution maps. Cuphea saxatilis S. A. Graham, sp. nov. from Colombia and Cuphea trisperma S. A. Graham, sp. nov. from Venezuela are newly described. Cuphea killipii Lourteig is placed in synonomy of C. philombria Lourteig. Presence or absence of a floral spur, position and shape of a nectary-like floral organ, the “disc”, and presence of two major pollen types suggest the section is not monophyletic, but consists of a minimum of two phylogenetic lineages, one in the Guiana Shield region in Venezuela and eastward, the other in low montane forests and on outliers of the Guiana Shield in Colombia and northern Ecuador. Fossilized Cuphea pollen grains resembling two types of pollen known in sect. Amazoniana, establish the presence of the genus in the Mio-Pliocene to Holocene of northern South America in areas occupied today by members of the section.

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Botanical novelties from Sierra de Maigualida, southern Venezuela. II

Cited by 3 publications

References 19 publications

Botanical novelties from the Sierra de Maigualida, southern Venezuela III: revision and two new species of the genus <em>Ilex (Aquifoliaceae)</em>

Botanical novelties from the Sierra de Maigualida, southern Venezuela III: revision and two new species of the genus <em>Ilex (Aquifoliaceae)</em>

Morfoanatomía del óvulo y la semilla en Turnera y Piriqueta (Turneraceae)

A Revision of Cuphea section Amazoniana s. s. (Lythraceae)

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