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Ixora kalehensis, a new Rubiaceae species from the Democratic Republic of the Congo

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Background. The rain forest genus Ixora currently comprises 37 species in Continental Africa. Within the framework of a treatment of the genus for the Flore d’Afrique centrale, a new species is described from D.R. Congo, despite its being known from only two specimens.
Methods.Standard methods of herbarium taxonomy are followed.
Key results.Ixora kalehensis De Block, a new species from the Central Forest District in D.R. Congo, is described and illustrated. Ixora kalehensis remains under-collected and relatively poorly known but can nevertheless easily be distinguished from other Ixora species. The most distinctive character is the colour of the dried leaves: blackish on the upper surface and vivid brown on the lower surface. Other important characters are the small-sized, compact and sessile inflorescences and the large tree habit. The species is only known from two specimens collected in the 1950s and its preliminary IUCN status is Endangered (EN B2ab(iii)). The lack of more recent herbarium material highlights that the collecting effort in D.R. Congo remains substandard. It is hoped that the formal description of Ixora kalehensis will draw attention of international and local collectors and will result in more material and knowledge on the species.
The description of this species brings the number of Ixora species to thirteen for central Africa (D.R. Congo, Rwanda and Burundi) and to twelve for D.R. Congo.
Originele taal-2Engels
TijdschriftPlant Ecology and Evolution
Volume151
Nummer van het tijdschrift3
Pagina's (van-tot)442-448
Aantal pagina's7
ISSN2032-3913
DOI's
StatusGepubliceerd - 2018

DOI

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