The Rudgea hostmanniana complex (Rubiaceae) in the Guiana Shield region

OLIVIER LACHENAUD; CARLA P. BRUNIERA; DANIELA C. ZAPPI

doi:10.11646/phytotaxa.561.3.1

Issue: Vol. 561 No. 3: 12 September 2022

Type: Article

Published: 2022-09-12

DOI: 10.11646/phytotaxa.561.3.1

Page range: 219-242

Abstract views: 27

PDF downloaded: 35

**The Rudgea hostmanniana complex (Rubiaceae) in the Guiana Shield region**

OLIVIER LACHENAUD⁺⁻
CARLA P. BRUNIERA⁺⁻
DANIELA C. ZAPPI⁺⁻

Meise Botanic Garden, Nieuwelaan 38, 1860 Meise, Belgium; Herbarium et Bibliothèque de Botanique africaine, C.P. 265, Université Libre de Bruxelles, Boulevard du Triomphe, 1050 Bruxelles, Belgium

Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Paulo, campus Diadema, Rua São Nicolau, 210, 09913-030, Diadema, SP, Brazil

Programa de Pós-graduação em Botânica, Instituto de Ciências Biológicas, Universidade de Brasília, Caixa Postal 04457, Brasília, Distrito Federal, 70910-970, Brazil; Museu Paraense Emílio Goeldi, Coord. Botânica, Av. Perimetral 1901, 66077-830, Belém, PA, Brazil

Brazil French Guiana Guyana Kaw Mountain Neotropical Region new species Palicoureeae Psychotrieae Rubioideae Suriname Venezuela Eudicots

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Abstract

A taxonomic revision of the Rudgea hostmanniana complex in the Guiana shield region is presented. This group includes species with sheathing stipules bearing dorsal appendages, thick glabrous leaves lacking domatia, inflorescences thyrsoid to glomerulate but not regularly dichotomous, a calyx tube absent or very short, a corolla tube 2–7(–13) mm long, and fruits usually brownish when immature and turning red or orange at maturity. Eight species are recognized, among which Rudgea billietiae, endemic to Kaw Mountain in French Guiana, is newly described and illustrated; it is assessed as Endangered according to IUCN criteria. The other species are R. bolivarensis, R. cornigera, R. coussareoides, R. hostmanniana, R. maypurensis, R. pungens, and R. tanaosepala. A key to the species is presented, as well as a table summarising their diagnostic characters.

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