These are the 50 most frequent species (in terms of the number of plots) occurring in the recent survey of the forestREplot database. We separate these for the tree layer (taller than 7 m), herbaceous layer (plants on the forest floor, below 1 m) and the mosses (Bryophyte layer, not always available). For each species we mention the number of regions and the number of plots in which it occurs, out of the regions and plots currently included in the database. We provide two tables: one for Europe and one for eastern North-America.

Europe

Rank	Tree layer	No. regions	No. plots	Herbaceous layer	No. regions	No. plots	Bryophyte layer	No. regions	No. plots
1	Fagus sylvatica	55	4123	Anemone nemorosa	57	5297	Eurhynchium striatum	10	951
2	Fraxinus excelsior	53	2724	Lamium galeobdolon	65	3658	Polytrichastrum formosum	19	905
3	Quercus robur	48	1986	Oxalis acetosella	60	3599	Hypnum cupressiforme	18	779
4	Carpinus betulus	52	1964	Fraxinus excelsior	48	3238	Plagiomnium undulatum	11	577
5	Acer pseudoplatanus	52	1752	Galium odoratum	58	3208	Atrichum undulatum	18	521
6	Ulmus glabra	36	1072	Acer pseudoplatanus	48	3125	Dicranum scoparium	15	500
7	Quercus petraea	39	1046	Fagus sylvatica	47	3006	Pleurozium schreberi	10	270
8	Picea abies	29	972	Dryopteris filix-mas	61	2991	Fissidens taxifolius	10	267
9	Abies alba	15	881	Mercurialis perennis	47	2933	Hylocomium splendens	9	256
10	Pinus sylvestris	29	685	Geum urbanum	64	2896	Rhytidiadelphus triquetrus	7	247
11	Alnus glutinosa	30	653	Athyrium filix-femina	56	2703	Brachythecium rutabulum	13	243
12	Acer platanoides	39	633	Brachypodium sylvaticum	58	2493	Dicranella heteromalla	14	224
13	Acer campestre	30	570	Convallaria majalis	54	2487	Pohlia nutans	14	221
14	Betula pendula	39	553	Poa nemoralis	63	2472	Thuidium tamariscinum	12	212
15	Tilia cordata	34	545	Polygonatum multiflorum	66	2420	Leucobryum glaucum	10	193
16	Quercus spec.	6	493	Carex sylvatica	62	2349	Rhytidiadelphus loreus	3	183
17	Betula spec.	4	234	Ficaria verna	42	2267	Eurhynchium hians	9	182
18	Betula pubescens	15	227	Milium effusum	59	2241	Plagiomnium affine	11	173
19	Corylus avellana	17	227	Rubus sect. Rubus	46	2200	Plagiochila asplenioides	4	170
20	Prunus avium	32	216	Paris quadrifolia	47	2060	Pseudoscleropodium purum	12	166
21	Sorbus aucuparia	28	199	Dryopteris carthusiana	57	1989	Mnium hornum	12	129
22	Tilia platyphyllos	22	196	Urtica dioica	68	1933	Brachythecium velutinum	8	120
23	Larix decidua	15	192	Viola reichenbachiana	50	1830	Ptilium crista-castrensis	3	100
24	Salix caprea	9	175	Deschampsia cespitosa	56	1779	Tortella tortuosa	3	95
25	Tilia cordata/platyphyllos	3	157	Lactuca muralis	53	1771	Cirriphyllum piliferum	5	81
26	Malus domestica	2	151	Rubus idaeus	52	1761	Rhizomnium punctatum	8	77
27	Sorbus torminalis	17	143	Stachys sylvatica	50	1746	Ctenidium molluscum	2	73
28	Quercus petraea/pubescens	1	141	Cardamine bulbifera	35	1737	Brachythecium spec.	5	71
29	Quercus cerris	11	138	Arum maculatum	31	1735	Dicranum polysetum	2	69
30	Prunus padus	11	111	Maianthemum bifolium	54	1734	Aulacomnium androgynum	6	65
31	Populus × canadensis	8	109	Fragaria vesca	59	1719	Eurhynchium praelongum	6	55
32	Hedera helix	13	100	Dryopteris dilatata	47	1681	Fissidens dubius	2	51
33	Quercus pubescens	8	100	Moehringia trinervia	64	1675	Plagiothecium denticulatum	10	38
34	Populus tremula	24	94	Hedera helix	51	1674	Plagiothecium undulatum	2	38
35	Ulmus minor	8	87	Melica uniflora	44	1651	Ptilidium ciliare	1	37
36	Crataegus spec.	4	66	Hepatica nobilis	27	1597	Lophocolea heterophylla	4	35
37	Malus sylvestris	9	66	Acer platanoides	41	1550	Isothecium alopecuroides	4	34
38	Fraxinus ornus	6	64	Geranium robertianum	64	1547	Plagiomnium rostratum	5	33
39	Robinia pseudoacacia	15	54	Ajuga reptans	61	1498	Ptychostomum capillare	2	30
40	Ulmus laevis	12	51	Asarum europaeum	32	1450	Sphagnum girgensohnii	1	30
41	Pyrus communis	13	46	Dactylis glomerata	54	1440	Rhytidium rugosum	1	27
42	Crataegus monogyna	9	45	Circaea lutetiana	55	1436	Plagiomnium cuspidatum	7	26
43	Alnus incana	5	39	Lathyrus vernus	39	1435	Mnium spec.	1	25
44	Tilia tomentosa	2	39	Carpinus betulus	41	1425	Orthodicranum montanum	4	25
45	Prunus serotina	8	35	Anemone ranunculoides	25	1413	Polytrichum commune	4	25
46	Salix alba	2	32	Aegopodium podagraria	50	1359	Dicranum spurium	1	24
47	Aesculus hippocastanum	5	31	Avenella flexuosa	39	1343	Pseudotaxiphyllum elegans	4	23
48	Sorbus aria	6	26	Ulmus glabra	35	1337	Plagiothecium curvifolium	2	21
49	Quercus rubra	13	25	Quercus robur	36	1263	Rhytidiadelphus squarrosus	4	21
50	Frangula alnus	6	23	Ranunculus auricomus	38	1249	Tetraphis pellucida	4	21

North-America

Rank	Tree layer	No. regions	No. plots	Herbaceous layer	No. regions	No. plots	Bryophyte layer	No. regions	No. plots
1	Acer saccharum	2	109	Carex spec.	6	417	Dicranum scoparium	1	64
2	Abies balsamea	2	102	Maianthemum canadense	6	357	Pleurozium schreberi	1	56
3	Betula papyrifera	1	84	Maianthemum racemosum	6	337	Brachythecium oedipodium	1	41
4	Picea spec.	2	69	Acer saccharum	4	304	Hylocomiastrum umbratum	1	41
5	Acer rubrum	2	65	Parthenocissus inserta	4	278	Dicranum fuscescens	1	35
6	Acer pensylvanicum	2	57	Prunus virginiana	6	276	Ptilium crista-castrensis	1	25
7	Betula alleghaniensis	2	56	Aralia nudicaulis	6	273	Dicranum montanum	1	24
8	Quercus rubra	1	26	Arisaema triphyllum	5	263	Polytrichum juniperinum	1	24
9	Tilia americana	1	26	Prunus serotina	6	262	Dicranum majus	1	23
10	Fagus grandifolia	1	25	Galium triflorum	6	260	Dicranum polysetum	1	20
11	Tsuga canadensis	1	17	Acer rubrum	5	259	Rhytidiadelphus triquetrus	1	12
12	Thuja occidentalis	1	13	Circaea lutetiana	5	258	Brachythecium campestre	1	11
13	Populus tremuloides	1	11	Quercus rubra	6	257	Brachythecium reflexum	1	11
14	Prunus serotina	1	11	Anemone quinquefolia	6	240	Callicladium haldanianum	1	11
15	Pinus strobus	2	9	Geranium maculatum	5	227	Bazzania trilobata	1	10
16	Prunus pensylvanica	1	9	Viola pubescens	5	227	Lepidozia reptans	1	10
17	Fraxinus americana	1	7	Athyrium filix-femina	5	225	Barbilophozia hatcheri	1	8
18	Prunus virginiana	2	5	Osmorhiza aristata	5	223	Pseudoleskeella tectorum	1	8
19	Alnus incana	1	4	Trientalis borealis	6	218	Hylocomium splendens	1	7
20	Fraxinus nigra	1	4	Polygonatum pubescens	5	217	Plagiochila porelloides	1	7
21	Populus grandidentata	1	4	Eurybia macrophylla	6	215	Plagiomnium cuspidatum	1	6
22	Ulmus americana	1	2	Geum canadense	5	197	Thuidium delicatulum	1	6
23	Acer platanoides	1	1	Tilia americana	5	197	Plagiothecium laetum	1	5
24	Alnus alnobetula	1	1	Pteridium aquilinum	5	195	Polytrichastrum formosum	1	5
25	Betula populifolia	1	1	Fraxinus pennsylvanica	4	194	Calliergonella lindbergii	1	4
26	Larix laricina	1	1	Toxicodendron radicans	5	193	Polytrichastrum alpinum	1	4
27	Populus balsamifera	1	1	Ulmus americana	3	192	Sphagnum spec.	1	4
28	Salix discolor	1	1	Vitis vulpina	5	191	Blepharostoma trichophyllum	1	3
29				Ostrya virginiana	6	183	Calypogeia integristipula	1	3
30				Amphicarpaea bracteata	5	182	Climacium dendroides	1	3
31				Viola sororia	3	174	Hypnum pallescens	1	3
32				Rubus allegheniensis	5	173	Plagiothecium cavifolium	1	3
33				Dryopteris carthusiana	6	169	Tetraphis pellucida	1	3
34				Uvularia grandiflora	4	165	Campyliadelphus chrysophyllus	1	2
35				Sanguinaria canadensis	4	162	Eurhynchiastrum pulchellum	1	2
36				Carya cordiformis	5	160	Herzogiella striatella	1	2
37				Rubus idaeus	5	160	Jamesoniella autumnalis	1	2
38				Fragaria virginiana	6	157	Jungermannia leiantha	1	2
39				Amelanchier spec.	6	151	Lophozia bicrenata	1	2
40				Ribes cynosbati	4	151	Mnium lycopodioides	1	2
41				Laportea canadensis	5	149	Plagiomnium medium	1	2
42				Thalictrum dioicum	5	149	Pohlia nutans	1	2
43				Cornus racemosa	5	148	Polytrichastrum pallidisetum	1	2
44				Corylus americana	6	147	Rhizomnium magnifolium	1	2
45				Trillium grandiflorum	4	143	Sanionia uncinata	1	2
46				Oryzopsis asperifolia	6	140	Trichocolea tomentella	1	2
47				Podophyllum peltatum	4	140	Atrichum altecristatum	1	1
48				Symphyotrichum lateriflorum	5	135	Aulacomnium palustre	1	1
49				Taraxacum campylodes	5	134	Brachythecium velutinum	1	1
50				Uvularia sessilifolia	5	132	Brachythecium erythrorrhizon	1	1