T21z Iberoatlantic Quercus rotundifolia forests on acid soils

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Description

Acidophilous analogue of T21y, not benefitting of the percolating nature of limestones and therefore requiring drier macroclimates like those of the southwestern boundaries of the ecoregion, mostly in the orographically sheltered basin of El Bierzo, where they replace T19A in south-facing slopes. In the original EUNIS framwork it should be included in the somewhat misnamed level VII unit T212422 (“Castilian encinares), a new level IV unit becoming necessary for the reasons stated under T21x.

Floristic Composition

Frequent species

Quercus rotundifolia 1, Rubia peregrina 0.6, Asplenium adiantum-nigrum aggr. 0.57, Erica arborea 0.55, Arbutus unedo 0.53, Daphne gnidium 0.49, Ruscus aculeatus 0.49, Teucrium scorodonia 0.49, Lonicera periclymenum 0.42, Dioscorea communis 0.38, Hedera helix aggr. 0.38, Lavandula pedunculata 0.38, Arenaria montana 0.34, Genista hystrix 0.34, Dactylis glomerata 0.34, Crataegus monogyna 0.32, Clinopodium vulgare 0.32, Osyris alba 0.3, Cytisus scoparius 0.3, Erica cinerea 0.28, Cistus salviifolius 0.26, Festuca elegans 0.26, Phillyrea angustifolia 0.25, Quercus pyrenaica 0.25, Lonicera etrusca 0.23, Genista falcata 0.21, Brachypodium sylvaticum 0.21, Lotus corniculatus 0.19, Pistacia terebinthus 0.17, Quercus suber 0.17, Origanum vulgare 0.17, Polypodium vulgare 0.15, Pteridium aquilinum 0.15, Cistus ladanifer 0.15, Agrostis castellana 0.15, Vicia sativa aggr. 0.13, Cytisus multiflorus 0.13, Prunus spinosa 0.13, Sedum forsterianum 0.13, Silene nutans 0.13, Glandora prostrata 0.11, Asplenium trichomanes 0.11, Juniperus oxycedrus 0.11, Anarrhinum bellidifolium 0.09, Thymus mastichina 0.09, Rosa canina aggr. 0.09, Jasione montana 0.09, Brachypodium pinnatum 0.09, Sedum album 0.09, Ranunculus ollissiponensis 0.09, Helictochloa marginata 0.09, Glandora diffusa 0.09, Galium pumilum aggr. 0.09, Genista scorpius 0.09, Genista florida 0.09, Erica scoparia 0.09, Geranium robertianum 0.09, Calluna vulgaris 0.08, Geranium purpureum 0.08, Helleborus foetidus 0.08, Prunus avium 0.08, Rubus ulmifolius 0.08, Genista hispanica 0.08, Arrhenatherum elatius 0.08, Andryala integrifolia 0.08, Euphorbia amygdaloides 0.08, Carlina corymbosa 0.08, Sanguisorba verrucosa 0.08, Ilex aquifolium 0.08, Galium mollugo aggr. 0.08, Cistus populifolius 0.08, Fraxinus angustifolia 0.08, Amelanchier ovalis 0.08, Teucrium chamaedrys 0.06, Viola riviniana aggr. 0.06, Spiraea hypericifolia 0.06, Erica umbellata 0.06, Sanguisorba minor 0.06, Pimpinella villosa 0.06, Hypochaeris radicata 0.06, Digitalis purpurea 0.06, Jasminum fruticans 0.06, Erica vagans 0.06, Laserpitium nestleri 0.06, Dorycnium pentaphyllum 0.06, Geranium lucidum 0.06, Genista tridentata 0.06, Cistus inflatus 0.06, Centranthus calcitrapae 0.06, Polygonatum odoratum 0.06, Epipactis helleborine aggr. 0.06, Asplenium ceterach 0.06, Halimium umbellatum 0.06

Phytosociology

  • Arbuto unedonis-Quercetum rotundifoliae
  • Genisto hystricis-Quercetum rotundifoliae

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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