Three new species of Tricalysia (Rubiaceae) from Atlantic Central Africa

Plant Ecology and Evolution

Olivier Lachenaud¹  Tariq Stévart²  Bonaventure Sonké³ 

[1] Meise Botanic Garden;Missouri Botanical Garden, Africa & Madagascar Department;University of Yaoundé I, Ecole NormaleSupérieure;

关键词: Tricalysia;    Rubiaceae;    Coffeeae;    new species;    taxo;   

DOI  :  10.5091/plecevo.2020.1670

来源: DOAJ

【 摘 要 】

Background and aims – The genus Tricalysia A.Rich. (Rubiaceae), regarded here in the strict sense (i.e., excluding Empogona Hook.f.), includes 77 species in tropical Africa, Madagascar and the Comoros. In the current paper, three new species from Atlantic Central Africa are described and illustrated; their conservation status is also assessed.Material and methods – This paper is based on a study of herbarium collections from BR, BRLU, K, LBV, P, WAG and YA. Normal practices of herbarium taxonomy have been applied. The conservation status assessments follow the IUCN Red List criteria.Results – Tricalysia lophocarpa O.Lachenaud & Sonké is endemic to Gabon and is best recognised by its fruits with 8–10 narrow longitudinal ribs. Tricalysia obovata O.Lachenaud & Sonké is endemic to Equatorial Guinea (Rio Muni) and may be recognised by its obovate leaves with rounded base, glabrous stems, and sessile flowers with included style and half-exserted anthers. Tricalysia wilksii O.Lachenaud & Sonké occurs in Gabon and southwestern Republic of Congo, and may be recognised by its glabrous stems and leaves, the latter with crypt domatia, its linear calyx teeth equalling or exceeding the tube in length, and its shortly pedicellate fruits. The three species are assessed respectively as Near-threatened (T. lophocarpa), Critically Endangered (T. obovata) and Vulnerable (T. wilksii).

【 授权许可】

Unknown