New record of Euphorbia thymifolia L. (Euphorbiaceae) from&amp;nbsp;the state of Acre, Brazil

Maria Cristina De Souza,Otávio Luis Marques Da Silva

doi:10.15560/17.1.137

Abstract

Euphorbia thymifolia (Euphorbiaceae) is a prostrate herb, distinguished from similar species by the combination of serrate leaf margin, puberulous ovary/fruit with capitate styles and pedicel not accrescent in fruit, splitting the involucre of the cyathia during maturation. In this paper we present the first record of E. thymifolia for the state of Acre, in Alto Juruá region, municipality of Cruzeiro do Sul, in a residential sidewalk crack habitat (07°36′58″S, 072°41′14.12″W WGS84). We also comment on its habitat and distribution, and include comparisons with commonly misidentified related species.

Highlights

Euphorbiaceae is one of the most expressive flora families in the Brazilian Amazon (BFG 2015)
In this paper we present the first record of E. thymifolia for the state of Acre, in Alto Juruá region, municipality of Cruzeiro do Sul, in a residential sidewalk crack habitat
Anisophyllum and, amongst the Brazilian species of this section, it is morphologically similar to E. adenoptera Bertol., E. dio eca Kunth, E. prostrata Aiton, and E. serpens Kunth due to the shared prostrate growth form and occurrence in disturbed areas (Fig. 2)

Summary

Introduction

Euphorbiaceae is one of the most expressive flora families in the Brazilian Amazon (BFG 2015). Ricardo Secco’s studies of this family have stood out since the eighties (Secco 1987, 1990, Secco et al 2012; Costa et al 2018; among others) Such studies found that the Amazon constitutes a diversity center of many genera (Bigio and Secco 2011, 2012; Souza and Secco 2014), some of which are endemic (e.g., Micrandropsis W.A. Rodrigues and Sandwithia Lanj.) and others have few specimens available in herbaria Most of these studies have prioritized trees and lianas (Souza et al 2014; Secco and Bigio 2017; Costa et al 2018; Secco et al 2019), and little attention has been given to herbaceous plants, even though they are common. Such conduct is observed in other families in the mentioned bioma (Souza et al 2020)

Methods

Results

Conclusion