In this study, we review the classification of two species, Elymus hispanicus and E. marginatus, which are restricted to highly valuable and sensitive Mediterranean ecosystems. The genomic composition of the two species is analysed by in situ hybridization. In addition, lodicule morphology and foliar anatomy of both species are compared with those of E. caninus, E. repens, E. sibiricus (i.e., the type species of Elymus s.s.) and Pseudoroegneria strigosa (i.e., the type species of Pseudoroegneria). The genomic formula 2n = 8x = 56; HStStSt is proposed for E. hispanicus and 2n = 4x = 28; StSt for E. marginatus. In this latter species, the absence of the ribosomal genes in one of the two St genomes suggests that diploidization may have occurred during the evolution of the species. Regarding foliar anatomy, E. hispanicus, E. caninus, E. repens, and E. sibiricus shared several characteristics, but the leaf blades of E. marginatus proved anatomically more similar to those of Ps. strigosa. The data compiled support the contention that: (i) E. hispanicus belongs to Elymus s.s.; (ii) E. marginatus should be transferred to Pseudoroegneria; and (iii) the morphology of the lodicules should be carefully reconsidered for appropriately describing the boundaries between Elymus s.s. and Pseudoroegneria. The new combination Ps. marginata is proposed and a detailed iconography of the plant is provided.

Macrosyringion longiflorum (Lam.) Rothm. in Morocco Palabras clave. Macrosyringion, Odontites, corología, Rif, Marruecos, Norte de África. Key words. Macrosyringion, Odontites, chorology, Rif, Morocco, Northern Africa.

The name Triticum caninum L. (Sp. Pl.: 86. 1753) is the basionym of the accepted name Elymus caninus (L.) L. (Fl. Suec., ed. 2: 39. 1755). This species is a non-densely caespitose perennial herb, that bears more or less lax inflorescences composed of erecto-patent to erect, not imbricate, subsessile (peduncle 0.1-0.6(1) mm) spikelets. The glumes are rounded on the back or slightly folded laterally and with 3-5(7) more or less similarly marked veins; the lemma is aristate with an awn usually longer than 10 mm. The species is distributed in Europe, Western and Central Asia and introduced in North America.The taxonomic delimitation of the genus Elymus L. (l.c. 1753: 83) is controversial, and E. caninus has therefore been included in different genera. Although described under the genus Triticum, Linnaeus (l.c. 1755) soon transferred it to Elymus.

No abstract

New floristic record for Carex tomentosa in Madrid province (Spain) Palabras clave. Cyperaceae, Carex tomentosa, corología, Sierra de Guadarrama, Madrid, España. Key words. Cyperaceae, Carex tomentosa, chorology, Sierra de Guadarrama, Madrid, Spain.