Two new species of the Oxygonum stuhlmannii–atriplicifolium complex (Polygonaceae) from Somalia

Ortiz, Santiago

doi:10.1046/j.1095-8339.2003.00183.x

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…Although Emex is nested within Rumex in our results (Fig. 1), previous studies using ITS and chloroplast data Qaiser, 2001 andLi &al., 2003) Plants shrubs, erect, xerophytic. Ocreae scarious or membranaceous.…”

Section: Fagopyreaecontrasting

confidence: 45%

Taxonomy of Polygonoideae (Polygonaceae): A new tribal classification

Sánchez

Schuster

Burke

et al. 2011

TAXON

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The subfamily Polygonoideae has a world‐wide distribution and is an important component of many countries’ floras. In this study we present the most comprehensive sampling available to date, including data from three chloroplast genes (matK, ndhF, rbcL) for 82 species in Polygonaceae (54 from Polygonoideae). Based on our results, we propose a new taxonomic classification for Polygonoideae that includes five well‐supported tribes: Calligoneae, Fagopyreae, Persicarieae, Polygoneae, and Rumiceae. Overall, the results from molecular data represent significant progress in understanding the evolutionary relationships of major groups within the family. This classification also provides an assessment of diagnostic morphological characters for the tribes. The present work will promote reevaluation of morphological characters within this diverse group, especially synapomorphies for Polygonoideae, and for tribes with a particularly complex history such as Fagopyreae, Persicarieae, and Polygoneae. A new combination, Fagopyrum tibeticum, is proposed.

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Section: Fagopyreaecontrasting

confidence: 45%

Taxonomy of Polygonoideae (Polygonaceae): A new tribal classification

Sánchez

Schuster

Burke

et al. 2011

TAXON

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“…2). Additional cp and nr data for more species of Oxygonum are clearly needed to determine its phylogenetic position since only one of the approximately 35 species (Graham, 1957(Graham, , 1958Germishuizen, 1987Germishuizen, , 1989Ortiz & Paiva, 1999;Ortiz, 2003) is included in this study.…”

Section: Discussionmentioning

confidence: 99%

Phylogeny of Polygoneae (Polygonaceae: Polygonoideae)

Schuster

Reveal

Kron

2011

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Genera included in Polygoneae such as Atraphaxis, Duma, Fallopia, Muehlenbeckia, Polygonella, Polygonum, Oxygonum, and Reynoutria are investigated using a molecular framework. Previous morphological studies had indicated that Polygonum is composed of sections Duravia, Polygonum, and Pseudomollia with the genus Polygonella included as a subsection of Polygonum sect. Duravia. One nuclear (nrITS) and three chloroplast (matK, ndhF, trnL–trnF) regions were analyzed with Maximum Parsimony and Maximum Likelihood methods to address evolutionary relationships within the tribe. The results show that Polygoneae is composed of three main clades: Knorringia as sister to all other taxa within Polygoneae, a clade of Reynoutria and Fallopia+Muehlenbeckia, and their sister clade of Atraphaxis, Duma, and Polygonum. The currently accepted sections within Polygonum are recovered and Polygonum sect. Duravia is sister to sections Polygonum and Pseudomollia. With Polygonella included in Polygonum, the appropriate new combinations and names are proposed. In addition, a few species of Polygonum are transferred to Atraphaxis. Oxygonum is not supported as a member of Polygoneae and its exact position awaits additional data.

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“…Ortiz, unpubl. data) projects, we also studied many taxa of this family from other areas of tropical and southern Africa (Ortiz, 2003). In 2002, during a stay at the Kirstenbosch Research Centre in Cape Town, South Africa, the first author studied a collection of Polygonum L. (Polygonaceae) from Springbok (Namaqualand, Northern Cape, South Africa), which was identified as a new species.…”

Section: Introductionmentioning

confidence: 99%