Notas acerca de xenófitos detectados en Cataluña, España

S Pyke

doi:10.3989/collectbot.2013.v32.007

Abstract

Estas notas incluyen seis especies, entre ellas tres gramíneas: Axonopus compressus, Dactyloctenium aegyptium y Megathyrsus maximus, la crucífera Lepidium densiflorum, la pequeña compuesta anual Soliva sessilis y la trepadora Aristolochia sempervirens (Aristolochiaceae), todas ellas presentes en o alrededor de la ciudad de Barcelona, Cataluña (nordeste de España). Forman parte de la creciente flora alóctona de la región. Algunas han sido citadas con anterioridad en la península, pero son novedades para Cataluña, mientras que otras parecen constituir nuevas citas para la Península Ibérica.

Highlights

Notes on xenophytes detected in Catalonia, Spain.— These notes include six species, among them three grasses: Axonopus compressus, Dactyloctenium aegyptium and Megathyrsus maximus, the crucifer Lepidium densiflorum, a dwarf annual composite Soliva sessilis, and the climbing Aristolochia sempervirens (Aristolochiaceae), all present in or around Barcelona, Catalonia
The large population of several thousand plants observed in 2012 in a re-sown road verge of the most southerly district of the city of Barcelona corresponds to L. densiflorum, a North American species which, over some parts of its range, comes into contact with L. virginicum L., resulting in populations with intermediate characteristics which prove difficult to classify
The species in question is closely related to A. fissifolius (Raddi) Kuhlm. (A. affinis Chase), a grass naturalized in the Minho region in the NW Iberian Peninsula, and recently detected in the province of Huelva in SW Spain (Valdés et al, 2011)

Summary

Introduction

Notes on xenophytes detected in Catalonia, Spain.— These notes include six species, among them three grasses: Axonopus compressus, Dactyloctenium aegyptium and Megathyrsus maximus, the crucifer Lepidium densiflorum, a dwarf annual composite Soliva sessilis, and the climbing Aristolochia sempervirens (Aristolochiaceae), all present in or around Barcelona, Catalonia (northeastern Spain). The large population of several thousand plants observed in 2012 in a re-sown road verge of the most southerly district of the city of Barcelona corresponds to L. densiflorum, a North American species which, over some parts of its range, comes into contact with L. virginicum L., resulting in populations with intermediate characteristics which prove difficult to classify. This low-growing more or less prostrate annual plant of the Composite tribe Anthemideae, originating in the Cono Sur of South America, is today naturalized in North America, Europe, Oceania and elsewhere, and apparently best considered taxonomically sensu lato at present.

Results

Conclusion