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A new species of Pentagonia (Rubiaceae, Dialypetalantheae) from Santander, Colombia, with an identification key to the Colombian species

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  • Andrés F. Majín-Ladino,
  • Carlos Paz-López,
  • M. Alejandra Jaramillo
Andrés F. Majín-Ladino
Universidad Militar Nueva Granada
Carlos Paz-López
Universidad Distrital Francisco José de Caldas
M. Alejandra Jaramillo
Universidad Militar Nueva Granada
DOI: https://doi.org/10.36253/jopt-20601

Published 2026-08-07

Keywords

  • Middle Magdalena Valley,
  • Gentianales,
  • Rubiaceae,
  • Taxonomy

How to Cite

Majín-Ladino, A. F., Paz-López, C., & Jaramillo, M. A. (2026). A new species of Pentagonia (Rubiaceae, Dialypetalantheae) from Santander, Colombia, with an identification key to the Colombian species. Webbia. https://doi.org/10.36253/jopt-20601

Copyright (c) 2026 Andrés F. Majín-Ladino, Carlos Paz-López, M. Alejandra Jaramillo

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Pentagonia santanderensis (Rubiaceae, Dialypetalantheae) is described and illustrated from the department of Santander, occurring in the municipalities of Cimitarra, La Belleza, and Landázuri in fragmented forests and primary forest edges associated with water sources. We compare this new taxon with morphologically similar species; the size of its leaves, the magenta coloration of the strongly pleated leaf bases, and the color, indumentum, and size of the corolla, as well as the fruits, are diagnostic characters. This new species increases the number of Pentagonia species recorded in Colombia to 23. Based on the IUCN criteria, P. santanderensis is assessed as Endangered (EN B2a(ii)b(iii)) due to its restricted distribution and continuing decline in habitat quality.

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