Carmen Acedo

Taxonomy and New Taxa in Eurasian Carex (Section Phaestoglochin, Cyperaceae)

Abstract Supported by detailed phenetic macro- and micromorphological characters, ecology, chorological studies, numerical and phylogenetic analysis, and all known data about Eurasian species of Carex muricata group (sect. Phaestoglochin), together with their biogeography, we have redefined this group and its subordinate aggregates. Four new taxa are described, illustrated and compared with putative related species: Carex spicata subsp. andresii, endemic to the inner part of the Iberian Peninsula, has the perigynum beak smooth and slightly corky at the base. Carex omeyica, from the southern mountains of Spain and North Africa, has erect-spreading oval perigynia and oval brown glumes without scarious margins. Two new subspecies of C. muricata are described: C. muricata subsp. cesanensis, from European mountains, has a big trullate perigynium 4.5–5.25 mm long with a short beak, and C. muricata subsp. ashokae, from the Eastern European Mountains to the Himalaya, has an oval perigynium 5–6 mm long with a longer beak. On the other hand, C. pairae is not a taxon subordinate to C. muricata. A key to the new and related taxa belonging to the aggregate is included.

A Comparative Study of the Inflorescence in the Genus Carex (Cyperaceae)

Abstract The inflorescences of 110 species of Carex were studied in the context of the latest phylogenetic framework of the tribe Cariceae, including broad taxonomic coverage by sections. Their structure is analyzed to infer their taxonomic value and to place these structures within a phylogenetic framework based on recent work in the genus. The inflorescence-unit is a paracladium. It consists of a branch composed of a prophyll, peduncle, bract, and pseudospike with one or more spikelets. The particular features and general trends of the inflorescences are analyzed, summarized, and interpreted according to hypotheses of the evolution of the genus. Such evolutionary patterns as ramification, homogenization, reduction, and sexual specialization combine in different ways during the evolution of the Carex inflorescence. Taking into account the inflorescence structure, we discuss the inclusion of the unispicate species of Carex in the Caricoid Clade and the differences among Caricoid, Vignea, and Core Carex clades.

De Plantis Legionensibus. Notula XVII

Se aportan algunas novedades floristicas para la provincia de Leon, indicando aspectos de interes acerca del habitat, corologia, o referencias fitosociologicas, en su caso, de algunos taxones naturalizados o que forman parte de comunidades terofiticas arvenses.

Two new brome-grasses (Bromus, Poaceae) from the Iberian Peninsula

Abstract Acedo, C. & Llamas, F.: Two new brome-grasses (Bromus, Poaceae) from the Iberian Peninsula. — Willdenowia 27: 47–55. 1997. — ISSN 0511-9618. Bromus cabrerensis and B. nervosus (B. subg. Bromus) from the Iberian Peninsula are described as species new to science and illustrated. The tetraploid B. cabrerensis (2n = 28) is closely related to the B. hordeaceus complex, whereas B. nervosus holds a rather isolated position.

Revision del género Dactylis L. (Poaceae) en el N. O. de la Península Ibérica

ResumenSe estudia el genero Dactylis L. (Poaceae) en el N.O. de la Peninsula Iberica mediante tecnicas de taxonomia numerica. Se reconoce una especie Dactylis glomerata L. con cuatro subespecies: subsp. glomerata, subsp. hispanica, subsp. marina y subsp. aschersioniana.Se aporta un estudio anatomico de las laminas foliares de las cuatro subspecies y una clave dicotomica que permite identificar las subspecies que viven espontaneamente en el noroeste peninsular.

A New Species of Tridens (Poaceae) from Brazil

Abstract A new species of Poaceae from Brazil, Tridens riograndensis Acedo & Llamas, is described and illustrated. Complete morphological and anatomical descriptions are made. The new species can be distinguished from other species of Tridens by possessing glumes with obtuse apices, paleas that are shorter than the lemma, and spiciform panicles. A key to morphologically similar species is offered.

Typification of some of Hudson's plant names in Carex L

The types of seven names of Carex species described by Hudson in the first and second editions of Flora anglica are designated here. Four lectotypes are chosen; two are plates, from Morison and Plukenet, a third is from original material conserved at BM-SL (all of them fixed by epitypes) and a fourth is from original material conserved at K. For the remaining three names, we have designed neotypes, selecting among appropriate material from the same regions and habitats indicated by Hudson.