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Marcos. Este es un artículo de acceso abierto, distribuido bajo los términos de la Licencia Creative Commons Atribución-NoComercial-CompartirIgual 4.0 Internacional.(http://creativecommons.org/licenses/by-nc-sa/4.0/), que permite el uso no comercial, distribución y reproducción en cualquier medio, siempre que la obra original sea debidamente citadas. Para uso comercial, por favor póngase en contacto con

Rosmarinus officinalis subsp. valentinus (lamiaceae) is described as a new subspecies in the flora of the Iberian Peninsula. the diagnostic characters for the subsp. valentinus include several morphological differences, mainly based on a distinctly prostrate habit, a reduced leaf size, smaller calyx and corolla, and white flower. a comparative table with diagnostic morphological features to distinguish among the three subspecies of the R. officinalis is provided. Habitat, ecology, greenhouse cultivation and phenolic profile are also considered.

The typification of the names Centaurea aspera L. and C. isnardii L. (Asteraceae) is discussed. A lectotype for C. aspera is designated from original material conserved in UPS-BURSER (Joachim Burser Herbarium). Centaurea isnardii is typified by an illustration of Isnard (1719) confirming this name as a synonym of C. aspera subsp. aspera.

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The genus Centaurea Linnaeus (1753: 909) (Asteraceae) comprises a large number of taxa mainly occurring in the Mediterranean region and southwest Asia (Susanna & Garcia-Jacas 2007). Centaurea seridis Linnaeus (1753: 915) is distributed from south Europe (Spain incl. Balearic Islands, Italy incl. Sicily, France, Albania and Greece) to northwest Africa (Algeria, Morocco and Tunisia). From a nomenclatural standpoint, Centaurea seridis has not been typified (Jarvis 2007: 402). This paper proposes the designation of a lectotype for this Linnaean name, based on the analysis of the protologue and original material.

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Centaurea inexpugnabilis, a new species from section aCroCentron for the iberian flora.-A new species for the genus Centaurea L. (sect. Acrocentron, Asteraceae) is described: C. inexpugnabilis, sp. nov. This plant has been found in the Mallos de Riglos (Riglos, Huesca, Spain), and its distribution is currently limited to the northeastern of the Iberian Peninsula. A description and diagnosis, iconography and several tables showing the main diagnostic characters to differentiate it from its related species is reported. Key words: Asteraceae; Centaurea; new species; sect. Acrocentron; Spain; taxonomy. ResumenCentaurea inexpugnabilis, una nueva especie de la sección aCroCentron para la flora ibérica.-Se describe una nueva especie para el género Centaurea L. (sect. Acrocentron, Asteraceae): C. inexpugnabilis, sp. nov. Esta planta ha sido localizada al pie de los Mallos de Riglos (Riglos, Huesca) y su distribución se circunscribe por el momento al cuadrante nororiental de la península ibérica. Junto a su descripción y diagnosis, se aporta una lámina y varias tablas con los principales caracteres diagnósticos que la diferencian de las especies más próximas.