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Issue: Vol. 763 No. 1: 18 Jun. 2026
Type: Article
Published: 2026-06-18
DOI: 10.11646/phytotaxa.763.1.8
Page range: 93-100
Abstract views: 0
PDF downloaded: 0

Allamanda karstica (Apocynaceae), a new species from limestone outcrops in central Brazil

Jardim Botânico do Rio de Janeiro; Rua Pacheco Leão; 915; 22460030; Rio de Janeiro; RJ; Brazil
Universidade Estadual Paulista (UNESP); Campus Rio Claro; Instituto de Biociências; Departamento de Biodiversidade; Av. 24A; 1515; 13506–900; Rio Claro; SP; Brazil
Jardim Botânico do Rio de Janeiro; Rua Pacheco Leão; 915; 22460030; Rio de Janeiro; RJ; Brazil; Instituto Chico Mendes de Conservação da Biodiversidade; Parque Nacional do Descobrimento; 45980000; Prado; BA; Brazil
Eudicots Cerrado Gentianales Neotropical Region

Abstract

Allamanda is a Neotropical genus of Apocynaceae consisting of shrubs, treelets or scandent plants usually with verticillate leaves and intrapetiolar colleters, showy flowers, foliaceous sepals, corolla tubular-campanulate, usually yellow or sometimes purple, violet, lilac to red, cream, salmon, and dehiscent capsular fruits characterized by echinate, smooth or muricate surfaces. During field expeditions in the limestone outcrops of Tocantins State in central Brazil this new species was discovered. Herein we describe Allamanda karstica, a unique species in the genus due to its smooth fruit surface with spines limited to dehiscing fissures. Color photographs, a distribution map, preliminary conservation assessment, morphological comparisons with the related species, as well as an identification key to Allamanda occurring in limestone outcrops of Brazil are presented herein.

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How to Cite

Marcusso, G.M., Lombardi, J.A. & Forzza, R.C. (2026) Allamanda karstica (Apocynaceae), a new species from limestone outcrops in central Brazil. Phytotaxa 763 (1): 93–100. https://doi.org/10.11646/phytotaxa.763.1.8