Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Taxonomic revision the species of the genus Chloris (Poaceae: Chloridoideae) in South America.

Abstract

A taxonomic revision of the genus Chloris Sw. in South America was made. As a result of this study, 25 taxa are recognized, most of them are native, some introduced or naturalized, distributed from Colombia and Venezuela to Argentina. The genus is recorded for the first time to North of Patagonia: C. virgata Sw. One new taxon is described for science: Chloris ciliata f. reptans A. M. Molina & Rúgolo and two new combinations are established: C. dandyana var. breviaristata (Hack.) A. M. Molina & Rúgolo and C. dandyana var. stolonifera (Parodi) A. M. Molina & Rúgolo. The identity of taxa previously included under synonym are reexamined: C. ciliata f. breviseta Hack., C. grandiflora Roseng. & Izag. and C. parodiana Roseng. & Izag. A new taxon is cited for Argentina: C. truncata R. Br., new for South America. The following new records for Bolivia and Paraguay are given: C. canterae Arechav., C. castilloniana Lillo & Parodi var. castilloniana, C. castilloniana var. pubescens Caro & E. A. Sánchez, C. ciliata Sw. f. ciliata, C. ciliata f. breviseta Hack., C. dandyana var. breviaristata (Hack.) A. M. Molina & Rúgolo, C. dandyana var. stolonifera (Parodi) A. M. Molina & Rúgolo and C. parvispicula Caro & E. A. Sánchez. In addition, the following taxa are recognized: C. affinis Caro & E. A. Sánchez, C. berroi Arechav., C. dandyana C. D. Adams var. dandyana, C. exilis Renvoize, C. gayana Kunth, C. halophila Parodi var. halophila, C. halophila var. humilis Chr. Müller, C. inflata Link, C. orthonoton Döll, C. pycnothrix Trin., C. radiata (L.) Sw. and C. sesquiflora Burkart. New synonyms are established. Nomenclatural considerations about problematic taxa within Chloris and a discussion about the identity of C. elata Desv. and C. barbata Sw. is given. The following taxon is excluded within Chloris: C. submutica Kunth and included in Eustachys Desv. A dichotomic key for recognizing all species, varieties and forms that grow in South America is given, as well as a description, synonyms, iconography, geographical distribution, ecological observations and vernacular names for each species are provided. The morphological characters of taxonomic value for the species are discussed. Results of epidermal observations on spikelets with scanning electron microscopy (SEM) has been made.