Friday, 5 December 2014

Two new species of Bigonia from Brazil.


Bigonias of the genus Tynanthus are lianas (woody climbers) found across the Neotropics (tropical areas of Central and South America), but reaching their maximum diversity in the wet forests of Amazonas State, and wet Atlantic forests of Brazil.

In a paper published in the journal PhytoKeys on 24 October 2014, Maria Cláudia de Medeiros and Lúcia Lohmann of the Departamento de Botânica at the Universidadede São Paulo describe two new species of Tynanthusfrom Brazil, discovered during a revision of the genus.

The first new species described is named Tynanthus densiflorus, in reference to its densely packed flowers, which are white or yellow and produced in August. The species was found growing only around Manaus in Amazonas State. While the species was found in the Reserva Florestal Adolpho Ducke, where there was a reasonable population of the plants, no plants have been found at any great distance from the rapidly expanding Manaus urban area, and as such de Medeiros and Lohmann suggest that the species should be considered to be Vulnerable under the terms of the International Union for the Conservation of Nature’s Red List of Threatened Species until additional studies have been carried out to fully determine the plant’s conservation status.

Flowering branch of Tynanthus densiflorus. Lilian Procópio in de Madeiros & Lohmann (2014).

The second new species is named Tynanthus espiritosantensis, meaning ‘from Espírito Santo’; the species was found growing in wet forests around Linhares in Espírito Santo State. This species produces white flowers from December to February, and has distinct bromeliad-like prophylls (leaflets) around its axillary buds (points at which smaller stems branch of from main stems).

Flowering branch of Tynanthus espiritosantensis. D.A. Folli in de Madeiros & Lohmann (2014).

See also…

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