Novedades en Rapatea (Rapateaceae) para Colombia

Abstract

Rapatea isanae, from the upper Isana [Içana] river, Guianía Department, Colombia, is described and illustrated, and its morphological relationships with allied species are discussed. This taxon is remarkable for Rapatea in its small stature (15-30 cm tall) and leaves, and it is only the second species with white petals in a genus that otherwise has only yellow petals. It is most closely R. spruceana, with the base of the leaf blade gradually tapering from the intergrading into the petiole, and the bractlet of the spikelet and sepal shape. However, this new species differs from R. spruceana in its shorter size, sparse verrucose on the lower surface, the length of the attenuate portion of the involucral bracts, and the shape and color of the petals. It also has similarities to R. longipes and R. modesta in its ventricose sheath-leaf, inflorescence shape, and bractlets equal in length. A previously described species from Colombia is restablished (i.e., R. modesta), and one variety is elevated to the rank of species (i.e., R. paludosa var. sessiliflora to R. sessiliflora ). An updated key to the all twenty five species of Rapatea, and an abstract in Kuripaco are also provided. © 2016. Acad. Colomb. Cienc. Ex. Fis. Nat. Novedades en Rapatea (Rapateaceae) para Colombia ResumenRapatea isanae, una nueva especie del alto río Isana, Departamento del Guianía, Colombia, es descrita, ilustrada, y sus relaciones morfológicas con las especies afines son discutidas. Esta especie es notable en el género Rapatea por el tamaño de las plantas (entre 15 y 30 cm de altura), las hojas muy pequeñas, y los pétalos blancos, siendo la segunda especie con este carácter en un género en el cual predominan los pétalos amarillos. Por la base de las hojas transformándose gradualmente en un pecíolo, la morfología de las bractéolas de las espiguillas y los sépalos, R. isanae está relacionada con R. spruceana. Por las vainas basales de las hojas ventricosas, la forma convexa de las inflorescencias y las bractéolas del mismo tamaño con R. longipes y R. modesta, respectivamente. Sin embargo, esta nueva especie difiere de R. spruceana por ser plantas muy pequeñas, el envés esparcidamente verrugoso, el largo de la porción atenuada de las brácteas involúcrales y la forma y color de los pétalos. Se restablece una especie previamente descrita para Colombia (i.e., R. modesta), y una variedad es elevada al rango de especie (i.e., R. paludosa var. sessiliflora a R. sessiliflora). Adicionalmente se presenta una clave actualizada de las 25 especies aceptadas de Rapatea y un resumen en Kuripaco. © 2016. Acad. Colomb. Cienc. Ex. Fis. Nat.

Geographic range extension of Rapatea paludosa Aubl. (Rapateaceae) to Maranhão state, northeastern Brazil

“…The specimens were herborized according to the usual botanical methodology (Fidalgo and Bononi 1989) and incorporated into the MAR herbarium (acronym follows Thiers 2019) of the Federal University of Maranhão. Identification keys and relevant literature (Maguire 1965;Harris and Harris 1994;Forzza and Costa 2005;Aymard and Arellano-Peña 2016;Praia et al 2016) were used to identify the species. The names of the authors and abbreviations follow International Plant Names Index (IPNI 2019).…”

“…is a predominantly South American genus with circa 25 species of terrestrial herbs distributed in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Panama, Peru, Suriname, Venezuela, and Trinidad and Tobago (Aymard and Arellano-Peña 2016;Tropicos 2019). It is the most species-rich genus of Rapateaceae in Brazil, with approximately 14 species, three of which are endemics: Rapatea pycnocephala Seub., Rapatea rugulosa Maguire, and Rapatea undulata Ducke (Aymard and Arellano-Peña 2016;Praia et al 2019). Only one species, Rapatea pycnocephala, has been recorded in Maranhão state (Praia et al 2019), and we report here the first collection of Rapatea paludosa in this state, which is also the second report in the Northeastern Region of Brazil, along with its collections from the state of Bahia (Praia et al 2019).…”