https://hdl.handle.net/2072/353040 2026-03-12T19:20:35Z https://hdl.handle.net/2072/537645 Tres tàxons endèmics del gènere Spergula (Caryophyllaceae) del nord d’Àfrica, dos d’ells llargament ignorats Romo, Àngel M.; Pyke, Samuel Es proposen dues noves combinacions nomenclaturals dins el gènere Spergula (Caryophyllaceae): Spergula tibestica (Quézel et Monnier) Lebrun ex Romo et Pyke, un taxon endèmic del massís de Tibesti (Txad), i Spergula oreophila (Litard. et Maire) Romo et Pyke, endèmic de la serralada de l’Alt Atles (Marroc). Es comparen aquest dos tàxons amb el tàxon proper Spergula fontenellei Maire, endemisme dels massissos del Hoggar, Teffedest i Tassili-n-Ajjer (Algèria).; Combinations in the genus Spergula (Caryophyllaceae): three taxa endemic to northern Africa, two of them largely overlooked. Taking into account their morphology and chorology, two new combinations in the genus Spergula (Caryophyllaceae) are proposed. Spergula tibestica (Quézel et Monnier) Lebrun ex Romo et Pyke, for a taxon endemic to the Tibesti massif (Chad) and Spergula oreophila (Litard. et Maire) Romo et Pyke, endemic to the High Atlas range (Morocco). A comparison between them with the close relative Spergula fontenellei Maire, endemic to Hoggar, Teffedest and Tassili-n-Ajjer massifs (Algeria) is provided. 2018-11-20T00:00:00Z https://hdl.handle.net/2072/537590 Addicions i comentaris a la flora vascular autòctona i aŀlòctona de les muntanyes de Prades Molero, Julià; Pyke, Samuel Aportem 57 noves citacions de plantes vasculars per a la Flora de les Muntanyes de Prades (Catalunya meridional); 30 són tàxons autòctons i 27 aŀlòctons, amb un valor corològic divers. Anacyclus homogamus es cita formalment per primera vegada de Catalunya. El descobriment d’Orobanche castellana a prop de Prades representa una important novetat per a la flora catalana. Entre les espècies autòctones moltes són novetat per al territori d’estudi i fins i tot per al migjorn de Catalunya. Per a d’altres de rara freqüència ampliem o completem la seva distribució al territori amb noves quadrícules UTM 10 × 10 km. Ampliem notablement el grup de plantes aŀlòctones amb noves citacions. Moltes d’aquestes espècies aŀlòctones s’han introduït recentment, atès que la majoria no eren presents en catàlegs florístics realitzats abans de l’any 2000, ni en aportacions florístiques més actuals. Es discuteix quines han estat les causes més probables i les vies de penetració més plausibles d’aquestes introduccions.; 57 new records of vascular plants for the flora of the Prades Mountains (Southern Catalonia) are detailed; 30 are autochthonous and 27 allochthonous, with a wide chorological range. Anacyclus homogamus is formally cited for the first time for Catalonia. The discovery of Orobanche castellana near Prades represents an important novelty for the Catalonian flora. Among the allochthonous species many are new for the studied area and, besides, for the south of Catalonia. For others of infrequent occurrence we increase or complete the distributional range with new UTM 10 × 10 grid squares. We augment significantly the group of non-native plants with new records. Many of these species are of recent introduction, not appearing in floristic catalogues prior to 2000 nor in more recent floristic treatments. The most probable causes and arrival routes of these introductions are ennumerated in the discussion. 2019-03-31T00:00:00Z https://hdl.handle.net/2072/536907 Genome size of grass Festuca mountain species from the southwestern European Pyrenees: variation, evolution, and new assessments Garnatje, Teresa; Catalán, Pilar; Inda, Luis A.; Vallès, Joan; Pyke, Samuel Festuca is one of the most ecologically and economically important genera of temperate grasses. Species of its type subgenus, Festuca, are common components of cool-seasonal pastures and are especially frequent in mountainous areas, where there are often several morphologically similar species that grow in the same or comparable habitats and sometimes live in sympatry. Nuclear DNA assessments by fow cytometry can be used to identify taxa and uncover new ploidy levels in species complexes for which new chromosome data are provided or previous chromosome counts and genome sizes are known. Holoploid (2C) values of newly studied Pyrenean Festuca subgen. Festuca sects. Eskia, Festuca and Aulaxyper species fall within the expected ranges for these taxonomic groups and include 2x, 4x, 6x and 8x ploidy levels. Monoploid (1Cx) genome sizes of diploids and polyploids are larger in the species of the more ancestral F. sect. Eskia group showing a decreasing trend in the species of the more recently evolved F. sects. Festuca and Aulaxyper lineages. 1Cx values of high polyploid Aulaxyper taxa are among the smallest of the three Festuca sections, corroborating previous fndings. Our analysis provides new genome size values and inferred ploidy levels for hexaploid F. heteromalla and octoploid F. trichophylla and highlights the genomic and ecological diferentiation of tetraploid F. gautieri susbsp. gautieri from diploid F. gautieri subsp. scoparia 2023-07-30T00:00:00Z https://hdl.handle.net/2072/536044 El margalló (Chamaerops humilis L., Arecaceae) als litorals central i septentrional de Catalunya: autòcton, introduït o reaparegut? Gómez-Bellver, Carlos; López-Pujol, Jordi; Farelo, Paula; Pyke, Samuel; Montserrat, Josep Maria; Nualart, Neus; Ibáñez Cortina, Neus Chamaerops humilis L., el margalló, és l’única palmera nadiua de la conca Mediterrània occidental. A Catalunya (nord-est de la penín- sula Ibèrica), el seu límit nord de distribució natural se situa al massís del Garraf. Segons bibliografia antiga, però, l’espècie sembla que era present a la muntanya de Montjuïc (Barcelona), d’on s’hauria extingit. En aquest estudi presentem els resultats d’un extens treball de camp realitzat durant els últims cinc anys per tal de (1) comprovar si l’espècie encara persisteix a Montjuïc i (2) explorar si aquesta palmera també és present en altres zones de Catalunya (al nord del Garraf) no citades a la bibliografia i, en cas afirmatiu, intentar determinar si es tracta de poblacions naturals o introduïdes. Hem pogut detectar diverses poblacions a Montjuïc (una d’elles amb un miler d’individus aproximada- ment) compostes majoritàriament per individus joves i situades prop d’individus cultivats. Això fa pensar que aquests nuclis poblacionals tenen molt probablement el seu origen en diàspores provinents de jardins i, per tant, C. humilis hauria reaparegut en un indret que hauria format part de la seva àrea de distribució històrica. Caldria tractar l’espècie com a introduïda als indrets on l’hem observat situats al nord del riu Llobregat, perquè en la majoria dels casos les poblacions estan formades per individus isolats o agrupats en petits rodals.; Chamaerops humilis L., the European fan palm, is the only native palm in the western Mediterranean basin. In Catalonia (north-western Iberian Peninsula), the Garraf Massif is generally regarded as its natural north distribution limit. According to old accounts, however, the species seems to have occurred in Montjuïc Mountain, Barcelona, from where it would have been extinct. Herein we are presenting the results of extensive fieldwork conducted during the last five years in order to (1) check whether the species is still persisting in Montjuïc, (2) explore whether this dwarf palm is also present in other areas of Catalonia further north of the Garraf not cited in the literature and, if so, to disentangle its biogeographic status (i.e., native or alien). We have been able to detect several populations in Montjuïc Mountain (with a population containing roughly a thousand individuals) close to cultivated plants. The youth of most individuals and their proximity to cul- tivated plants indicate that they are probably escapes. This might suggest that C. humilis is today present in an area that would be part of its historical range. This palm should be considered as introduced in the remaining locations where the species has been observed north to the Llobregat river. Notably, in most of these places C. humilis occurs as isolated individuals or as very small stands 2023-06-01T00:00:00Z