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Jestrow B.,Florida International University | Jestrow B.,The Fairchild Challenge Program and Center for Tropical Plant Conservation | Rodriguez F.J.,Jardin Botanico Nacional | Francisco-Ortega J.,Florida International University | Francisco-Ortega J.,The Fairchild Challenge Program and Center for Tropical Plant Conservation
Taxon | Year: 2010

The Caribbean Island Biodiversity Hotspot is the largest insular system of the New World and a priority for biodiversity conservation worldwide. The tribe Adelieae (Euphorbiaceae) has over 35 species endemic to this hotspot, representing a prime example of speciation in the West Indies and involving taxa from Cuba, Hispaniola, Jamaica, and the Bahamas. These species form a monophyletic group and have traditionally been accommodated in two endemic genera, Lasiocroton and Leucocroton. A study based on scanning electron microscopy of pollen, macromorphology, and molecular analysis was conducted to reveal generic relationships within this group. Phylogenies were based on nucleotide sequences of the nrITS region and the non-coding cpDNA spacers psbM-trnD and ycf6-pcbM. Three major monophyletic assemblages were revealed; one of them is restricted to Hispaniola and is accommodated in a new genus, Garciadelia, with four species. The new genus is sister to a clade comprising two monophyletic groups, one including all species of Leucocroton and restricted to serpentine soils of Cuba, and a second including the species of Lasiocroton, occurring in Cuba, Hispaniola, Jamaica, and the Bahamas. Morphological, biogeographical, and ecological data provided additional support for each of these three monophyletic assemblages. Two new combinations (Lasiocroton microphyllus from Cuba, Garciadelia leprosa from Hispaniola) are made and four new species are described (Lasiocroton gutierrezii from Cuba, and Garciadelia abbottii, G. castilloae, and G. mejiae from Hispaniola).

Baeza C.M.,University of Concepcion | Ruiz E.,University of Concepcion | Novoa P.,Jardin Botanico Nacional
Chilean Journal of Agricultural Research | Year: 2010

The karyotype of Alstroemeria diluta subsp. chrysantha Ehr. Bayer from Chile was examined. The species has 2n = 2x = 16 chromosomes, with 4m + 4sm + 2st-sat + 4t + 2t-sat. The reported karyotype is very asymmetrical (AsK % = 71.4 and Syi = 40.0%). This karyotype is similar to that published previously for Alstroemeria graminea Phil.

Sobral A.,National University of Cordoba | Novoa P.,Jardin Botanico Nacional
Boletin de la Sociedad Argentina de Botanica | Year: 2014

A new species of orchid in the genus Chloraea, sect. Foliosae, is described. This species native from La Rioja (Argentina) represents the southernmost limit of distribution of this section, which ranges from Southwestern Peru to Northwestern Argentina. This new taxon is based on significant morphological and phenological differences, together with its geographical isolation relative to the remaining species within the genus Chloraea. The most obvious difference with the most related species (Chloraea praecincta Speg. et Kranzl. and Chloraea reticulata Schlechter) is the color of the labellar lamina, which is deep yellow in the new species and white in the other two. Among other differences C. praecincta do not have nectar pits and C. reticulata has the widened base of the column.

Sanchez C.,Jardin Botanico Nacional
Brittonia | Year: 2015

A new combination is provided for the Cuban species Phegopteris sericea in the genus Polystichopsis: Polystichopsis sericea. Also, a lectotype is designated for this species. © 2015, The New York Botanical Garden.

Jestrow B.,Florida International University | Jestrow B.,Center for Tropical Plant Conservation | Gutierrez Amaro J.,Jardin Botanico Nacional | Francisco-Ortega J.,Florida International University | Francisco-Ortega J.,Center for Tropical Plant Conservation
Journal of Biogeography | Year: 2012

Aim Our aim was to investigate the historical biogeography of the three genera of the Leucocroton alliance (i.e. Garciadelia Jestrow & Jiménez Rodr., Lasiocroton Griseb., and Leucocroton Griseb., Euphorbiaceae). Location The alliance is restricted to the Bahamas, Cuba, Hispaniola and Jamaica. Methods Members of the Leucocroton alliance, along with representatives from tribe Adelieae (Adelia L. and Philyra Klotzsch.), were included in a molecular phylogenetic analysis based upon nucleotide sequences of the internal transcribed spacer region of the nuclear ribosomal DNA and the non-coding chloroplast regions psbM-trnD and ycf6-pcbM. The program s-diva was used to calculate ancestral areas based on the phylogenetic trees and present species distributions. Results Phylogenetic analyses support the monophyly of the three genera. The ancestral area of the Leucocroton alliance is eastern Cuba and Hispaniola. Ancestral forms of Leucocroton arose on eastern Cuba and underwent two migrations across the island. The ancestor of Lasiocroton also originated on eastern Cuba followed by later dispersal to and speciation events on the other islands. Our study also suggests that ancestral forms of the Leucocroton alliance probably occurred on limestone soils. Main conclusions Our study concurs with previous hypotheses suggesting that the flora of serpentinite regions of the Caribbean derives from other types of soils. The serpentine endemics of the Leucocroton alliance have a single origin and represent one of the most extraordinary examples of speciation in this unique environment of the New World. The high colonization success achieved by the members of Leucocroton on serpentine soils was not attained by the other genera of the alliance, which occur on limestone areas. © 2011 Blackwell Publishing Ltd.

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