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Holotype of Rubovietnamia sericantha. Courtesy of the herbarium of the Kunming Institute of Botany, Chinese Academy of Sciences (KUN).
Source publication
Porterandia sericantha, originally published as Randia sericantha, is re-combined as Rubovietnamia sericantha. Because of its earlier published specific epithet, it is the correct name for the generic type, Rubovietnamia aristata. Rubovietnamia consists of two species distributed in SW China and N Vietnam.
Contexts in source publication
Context 1
... sericantha (W.C.Chen) W.C. Chen (1999: 384) is the only species ascribed to the genus in China. It was originally described as Randia sericantha W.C. Chen (1987: 298) based on collections from the Guangxi and Yunnan provinces, SW China (Fig. 1). Zahid & Wong (2010) pointed out that it is quite different from typical Porterandia in having the stipules just slightly fused at the base and not forming a distinct tubular sheath, a sparsely hairy corolla tube outer surface, long flexuous hairs on the inner surface of the corolla tube, and exerted anthers and style. They (Zahid & ...
Context 2
... by the illustrations provided by Chen (1987Chen ( , 1999 and Tirvengadum (1998), respectively. Chen (1987,1999) included a line illustration for the species, which incorrectly depicts an unequally bi-lobed stigma. After examining the type material, it was found that the stigma is club-like, grooved, with 2 equal lobes initially cohered together (Fig. 1). Zhang et al. (2007) had studied and noted specimen material identified by Tirvengadum when they reported R. aristata in China. We have checked an image of the type of R. aristata, and have examined all specimens cited by Zhang et al. These and Porterandia sericantha in Chinese herbaria represent the same species. At the specific rank, ...
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Citations
The diversification of ecological roles and related adaptations in closely related species within a lineage is one of the most important processes linking plant evolution and ecology. Plant architecture offers a robust framework to study these processes as it can highlight how plant structure influences plant diversification and ecological strategies. We investigated a case of gradual evolution of branching architecture in Atractocarpus spp. (Rubiaceae), forming a monophyletic group in New Caledonia that has diversified rapidly, predominantly in rainforest understory habitats. We used a transdisciplinary approach to depict architectural variations and revealed multiple evolutionary transitions from a branched (Stone's architectural model) to a monocaulous habit (Corner's architectural model), which involved the functional reduction of branches into inflorescences. We propose an integrative functional index that assesses branching incidence on functional traits influencing both assimilation and exploration functions. We showed that architectural transitions correlate with ecologically important functional traits. Variation in ecologically important traits among closely relatives, as supported by the architectural analysis, is suggestive of intense competition that favored divergence among locally coexisting species. We propose that Pleistocene climatic fluctuations causing expansion and contraction of rainforest could also have offered ecological opportunities for colonizers in addition to the process of divergent evolution.
Rubovietnamia coronula Alejandro and Meve, a new coastal Rubiaceae species from Davao del Sur, Philippines is here described and compared with Rubovietnamia nonggangensis and R. sericantha. This third species of Rubovietnamia is distinct from the two known species by its long leaf petioles, prominently keeled stipules, reduced calyx and corolla, outward curling of corolla lobes in anthesal flowers, included anthers and stigma, glabrous fruits with nectariferous disk, and numerous seeds.
