A new species of perennial Bromus (Bromeae, Poaceae) from the Iberian Peninsula.

Carmen Acedo,Félix Llamas

doi:10.3897/phytokeys.121.32588

Abstract

During a survey of the genus Bromus for the ongoing Flora Iberica, B.picoeuropeanussp. nov., a new orophilous species of perennial Bromus from Picos de Europa National Park, was found, and it is described and illustrated here. This new species belongs to the Bromuserectus complex and differs from the other perennial species of this group occurring in the Iberian Peninsula in its well-developed rhizome, the small innovation leaves and all peduncles and branches shorter than the spikelets. B.picoeuropeanus grows on calcareous stony soils associated with dry places. We provide a description and illustrations of the new species and an identification key for the most related European perennial species belonging to the complex.

Highlights

The genus Bromus L. is the only representative of the tribe Bromeae in Southwest Europe
This material was confirmed as a new species after a careful study and comparison with material deposited at JBAG, LEB, FCO, MA, MAF, JACA, SALA, SANT, VIT, representing the full distribution and variability of B. erectus Huds. from the Iberian Peninsula as well as specimens belonging to related species (B. condensatus Steud., B. stenophyllus Link, B. transsilvanicus Steud.) and other perennial European species (B. biebersteinii Roem. & Schult., B. moellendorffianus (Asch. & Graebn.)
Five perennials live in the Iberian Peninsula (Smith 1980; Acedo and Llamas 1999) including the cultivated and naturalized Bromus inermis Leyss. extensively cultivated all over the world, the weeds B. catharticus Vahl, and B. sitchensis Trin., and the native perennial species, B. benekenii (Lange) Trim., B. ramosus Huds., and B. erectus

Summary

Introduction

The genus Bromus L. is the only representative of the tribe Bromeae in Southwest Europe. The style insertion, which is pubescent at its apex and persistent in the caryopsis The taxonomy of this genus is considered troublesome and has been the subject of numerous regional taxonomic revisions Smith 1972; Acedo and Llamas 2001; Saarela et al 2007; Oja and Zimmermann 2010; Alonso et al 2014; Alonso 2015). It includes more than 170 species mainly in the Northern hemisphere (Acedo and Llamas 2001; Saarela et al 2014)

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