R1R2 Supra-Mediterranean perennial siliceous grasslands

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Description

Dominated by small mat-formers, tussock grasses, and forbs—including many annuals inhabiting the sandy clearings chronically generated by grazing, trampling and by the increased mortality that wind, soil creep or drought bring about in perennials and its seedlings (this sparsely vegetated clearings might be included in EUNIS unit R1N1, but most rélévés lump topgether both microhabitats, precluding a sound statistical distinction)—, this patched grassland, a calcifugous analogue of R1A4, occurs on shallow skeletal soils, nutrient-poor and drought-prone, developed in exposed areas at moderate to high altitudes on siliceous bedrocks (the intrinsically hostile ultramafic rocks enable occurrences at lower elevation). The habitat, rich in endemics, is a typical component of traditional pastoral landscapes grazed mostly by sheep, contributing to detain its evolution towards scrub referable to the blocks S33, S42 and S73.

Floristic Composition

Frequent species

Filago minima 0.47, Tuberaria guttata 0.42, Rumex acetosella 0.29, Plantago holosteum 0.29, Neoschischkinia truncatula 0.28, Thrincia saxatilis aggr. 0.26, Hypochaeris glabra 0.25, Vulpia bromoides 0.23, Jasione montana 0.22, Micropyrum tenellum 0.21, Poa bulbosa 0.21, Trifolium arvense 0.2, Ornithopus perpusillus 0.19, Sedum arenarium 0.19, Teesdalia nudicaulis 0.19, Anthoxanthum ovatum 0.18, Aira praecox 0.18, Aira caryophyllea 0.18, Agrostis castellana 0.18, Sedum brevifolium 0.17, Vulpia myuros 0.17, Trifolium campestre 0.16, Lotus corniculatus 0.16, Hypochaeris radicata 0.16, Arnoseris minima 0.15, Tolpis barbata aggr. 0.15, Moenchia erecta 0.14, Galium parisiense 0.14, Andryala integrifolia 0.13, Ornithopus compressus 0.12, Koeleria crassipes 0.11, Rumex bucephalophorus 0.11, Molineriella laevis 0.11, Trifolium glomeratum 0.11, Helictochloa marginata 0.1, Asterolinon linum-stellatum 0.1, Plantago lanceolata 0.1, Herniaria scabrida 0.1, Dactylis glomerata 0.09, Pilosella castellana 0.09, Cerastium glomeratum 0.09, Crucianella angustifolia 0.09, Dianthus laricifolius 0.09, Bromus hordeaceus aggr. 0.08, Arenaria querioides 0.08, Veronica arvensis 0.08, Trisetaria ovata 0.08, Ornithogalum concinnum 0.08, Sedum anglicum 0.08, Anthemis arvensis 0.08, Parentucellia latifolia 0.08, Trifolium subterraneum 0.08, Hispidella hispanica 0.07, Scleranthus annuus 0.07, Vicia sativa aggr. 0.07, Cerastium diffusum 0.07, Sanguisorba verrucosa 0.07, Petrorhagia prolifera 0.06, Bellis perennis 0.06, Juncus capitatus 0.06, Odontarrhena serpyllifolia 0.06, Sherardia arvensis 0.06, Anthyllis vulneraria 0.06, Euphorbia exigua 0.06, Centaurea paniculata aggr. 0.06, Spergula morisonii 0.06, Filago gallica 0.06, Scleranthus polycarpos 0.06, Erodium cicutarium aggr. 0.06, Hypericum linariifolium 0.06, Silene scabriflora 0.05, Anarrhinum bellidifolium 0.05, Jasione sessiliflora 0.05, Linaria amethystea 0.05, Linum bienne 0.05, Bromus tectorum 0.05

Regional distribution

Known occurrences and potential area of occupancy of the habitat type in the study region.
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Citation: IBEROATLANTICA – Flora and Habitats of the Cantabrian Mixed Forests ecoregion.
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