Stipules are leaf structures common in many groups of plants that can take a variety of forms. In Gentianales, interpetiolar stipules are considered a synapomorphy of Rubiaceae; however, some reports in the literature refer to their presence in other families. The goal of this study was to analyze the development of leaf primordia to investigate the possible presence of reduced or modified stip...

'Canga' is a name given to the ferruginous rocky fields that can be found in the 'Quadrilátero Ferrífero' of Minas Gerais, Brazil. The endemism and species richness make them areas of special biological importance, regarded as high-priority for conservation. Nevertheless, they are being threatened by intense mining activity. Aiming to understand more about this flora, this study was performed i...

[This corrects the article DOI: 10.1371/journal.pone.0126690.].

Sommera cusucoana Lorence, D. Kelly & A. Dietzsch, sp. nov., (Rubiaceae), a new species from Honduras, differs from the other Mesoamerican Sommera species by the combination of large, obovate leaves with long red petioles, glabrous or glabrate intervenal areas, red stipules, lax, sparsely pubescent inflorescences with red axes, flowers with red hypanthium and calyx, long fruiting pedicels, and ...

Kainulainen, K. (2021). A taxonomic revision of Melanoxerus (Rubiaceae), with descriptions three new species trees from Madagascar. Candollea 76: 105–116. In English, English and French abstracts.This paper provides a Kainul. & Bremer (Rubiaceae) – genus deciduous eye-catching flowers fruits that is endemic to Descriptions species, antsirananensis Kainul., atropurpureus maritimus are presented ...

With 10,700 species distributed in 637 genera, the Rubiaceae family is one of the largest of the angiosperms. Since it was previously evidenced that the fatty acid composition of photosynthetic tissues can be a tool for chemotaxonomic studies, the fatty acid composition of leaves from 107 Rubiaceae species highly representative of the diversity of the family was determined. Principal component ...

1. Subject and source Kraussia floribunda Harv. (Rubiaceae; Ixoroideae) is a shrub or small tree occurring in Mozambique, Swaziland and South Africa. It is one of only four species in a genus restricted to southern and tropical Africa, and the adjacent island of Socotra (Bridson 1995). The leaves and stems of Kraussia floribunda were collected in Kloof, KwaZulu-Natal in March 2008 and a voucher...