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Table II

Mean percent cover (± standard error [SEM]) of plant species in the mixed oak forests for which the percent cover exceeded 2%. Laurus nobilis was included because of its high frequency.

Plant species Cover % Frequency
(mean ± SEM)
Trees

Alnus glutinosa (L.) Gaertner 3.3 ± 3.3 1
Betula celtibericaa L. 5.0 ± 3.2 2
Castanea sativa Miller 9.1 ± 4.6 3
Fraxinus excelsior L. 5.0 ± 3.5 3
Laurus nobilis L. 0.8 ± 0.1 3
Quercus pyrenaica Willd. 3.7 ± 3.7 1
Quercus robur L. 41.7 ± 14.1 7
Robinia pseudoacacia L. 4.0 ± 1.7 3
Salix atrocinerea Brot. 5.3 ± 3.5 2

Shrubs

Cornus sanguinea L. 3.0 ± 0.8 3
Corylus avellana L. 31.0 ± 11.9 5
Crataegus monogyna Jacq. 4.1 ± 3.9 5
Frangula alnus Miller 3.1 ± 1.5 3
Rhamnus alaternus L. 6.5 ± 6.0 2
Rubus sp. 8.8 ± 2.2 7
Ulex gallii Planchon 8.9 ± 7.1 5

Climbers

Hedera helix L. 15.4 ± 9.7 6

 Ferns

Dryopteris affinis (Lowe) 5.1 ± 3.6 3
 Fraser- Jenkins
Polystichum setiferum 5.5 ± 4.1 2
 (Forsskål) Woynar
Pteridium aquilinum (L.) Kuhn 3.3 ± 1.7 4

Herbs

Poaceae 17.6 ± 6.5 7
Smilax aspera L. 10.2 ± 6.6 6