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A new endemic species of Amyris (Rutaceae) from the Magdalena River Valley in Colombia


Amyris pacis, a new species from the Magdalena River Valley in Colombia, is described and illustrated, including comments about its geographical distribution, habitat, phenology, conservation status and taxonomic affinities. The new species appears to be closely related to A. trimera due to its unifoliolate leaves and trimerous flowers, but differs from it by its longer leaflet blades with the base rounded to subtruncate, or occasionally subcordate (vs. cuneate), and secondary veins slightly ascending (vs. more strongly ascending). Being a threatened and endemic species, and one of the few species with trimerous flowers, it should be included in further studies to determine appropriate conservation plans and to improve knowledge about the morphology of species with trimerous flowers in Neotropical Rutaceae.


Amyris pacis, una nueva especie proveniente del valle del río Magdalena en Colombia, es descrita e ilustrada, incluyendo comentarios sobre su distribución geográfica, hábitat, fenología, estado de conservación y afinidades taxonómicas. La nueva especie parece estar estrechamente relacionada con Amyris trimera por la presencia de hojas unifolioladas y flores trímeras, pero se diferencia de ella por sus láminas foliolares más largas con la base redondeada a casi truncada, o en ocasiones ligeramente cordada (vs. cuneada), y venas secundarias ligeramente ascendentes (vs. más fuertemente ascendentes). Debido a que es una especie endémica y amenazada, y una de las pocas con flores trímeras, sería interesante incluirla en estudios posteriores para determinar planes de conservación adecuados y mejorar el conocimiento sobre la morfología de especies con flores trímeras en las Rutaceae Neotropicales.

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We thank the staff of herbaria COL, HUA, JAUM, MO, and UDBC for allowing our study of their specimens; Ana C. Pareja (HUA) for the illustration; Diego Zapata (UDBC), Heriberto David (HUA) and Juan Pablo Tobón (JAUM) for supplying information; Carlos Reynel (MOL) and one anonymous reviewer for his careful review of the manuscript and suggestions that improved it.

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Correspondence to Yeison Londoño-Echeverri.

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Londoño-Echeverri, Y., Trujillo-López, A.M. & Gereau, R.E. A new endemic species of Amyris (Rutaceae) from the Magdalena River Valley in Colombia. Brittonia 74, 272–279 (2022).

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  • Amyridoideae
  • plant taxonomy
  • Sapindales
  • threatened species
  • trimerous flowers