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. of regions	No. of plots	Shrub layer	No. of regions	No. of plots	Herb layer	No. of regions	No. of plots
1	Fagus sylvatica	73	7061	Acer pseudoplatanus	68	2907	Urtica dioica	88	2921
2	Acer pseudoplatanus	70	2507	Corylus avellana	67	2124	Polygonatum multiflorum	82	3193
3	Fraxinus excelsior	66	3562	Fraxinus excelsior	65	3128	Carex sylvatica	81	3673
4	Carpinus betulus	64	2307	Fagus sylvatica	64	5363	Poa nemoralis	81	3030
5	Quercus robur	60	2449	Sambucus nigra	62	1377	Geranium robertianum	80	2056
6	Acer platanoides	50	873	Carpinus betulus	61	1355	Geum urbanum	80	3542
7	Betula pendula	48	697	Sorbus aucuparia	59	1300	Oxalis acetosella	79	5639
8	Quercus petraea	48	1243	Ulmus glabra	52	1976	Scrophularia nodosa	79	1484
9	Ulmus glabra	48	1352	Acer platanoides	51	1237	Fragaria vesca	78	2098
10	Tilia cordata	43	814	Prunus avium	47	338	Milium effusum	78	2845
11	Picea abies	42	1424	Quercus robur	44	573	Moehringia trinervia	78	1952
12	Prunus avium	40	292	Cornus sanguinea	43	672	Lamium galeobdolon	77	6056
13	Sorbus aucuparia	39	257	Picea abies	42	1036	Athyrium filix-femina	76	3724
14	Alnus glutinosa	38	839	Euonymus europaeus	40	558	Dryopteris filix-mas	76	4908
15	Pinus sylvestris	36	845	Frangula alnus	39	653	Galium odoratum	76	4846
16	Acer campestre	35	662	Tilia cordata	37	722	Ajuga reptans	75	1862
17	Corylus avellana	31	402	Acer campestre	36	697	Brachypodium sylvaticum	75	3542
18	Populus tremula	28	106	Alnus glutinosa	34	338	Circaea lutetiana	73	2379
19	Tilia platyphyllos	27	185	Prunus spinosa	33	218	Deschampsia cespitosa	73	2493
20	Abies alba	24	1168	Crataegus monogyna	32	594	Stachys sylvatica	73	2549
21	Larix decidua	20	288	Lonicera xylosteum	32	810	Anemonoides nemorosa	72	7500
22	Torminalis glaberrima	19	149	Betula pendula	30	288	Maianthemum bifolium	71	1964
23	Betula pubescens	18	327	Crataegus laevigata	29	689	Rubus idaeus	71	2784
24	Hedera helix	17	122	Rosa canina	29	254	Cicerbita muralis	69	2413
25	Prunus padus	17	176	Viburnum opulus	29	321	Viola reichenbachiana	69	2824
26	Robinia pseudoacacia	17	57	Quercus petraea	28	305	Galium aparine	68	1915
27	Quercus rubra	16	42	Sambucus racemosa	27	357	Sorbus aucuparia	68	1920
28	Pyrus communis	15	48	Populus tremula	26	94	Acer pseudoplatanus	67	5517
29	Crataegus monogyna	14	135	Prunus padus	26	742	Fraxinus excelsior	67	5874
30	Salix caprea	14	234	Rubus idaeus	26	697	Convallaria majalis	66	2896
31	Ulmus laevis	13	74	Tilia platyphyllos	25	209	Fagus sylvatica	66	6252
32	Quercus cerris	12	162	Abies alba	24	643	Hedera helix	66	2581
33	Ulmus minor	12	122	Daphne mezereum	24	461	Mercurialis perennis	65	4976
34	Malus sylvestris	11	69	Cornus mas	23	199	Dryopteris dilatata	64	2498
35	Aria edulis	10	44	Hedera helix	22	243	Epilobium montanum	64	1168
36	Prunus serotina	10	39	Ligustrum vulgare	22	358	Aegopodium podagraria	63	1730
37	Populus canadensis	9	104	Rhamnus cathartica	22	119	Dactylis glomerata	63	1894
38	Quercus rosacea	9	23	Salix caprea	20	279	Dryopteris carthusiana	63	3020
39	Alnus incana	8	59	Prunus serotina	19	182	Paris quadrifolia	63	2360
40	Frangula alnus	8	27	Ulmus minor	19	155	Lolium giganteum	62	1312
41	Quercus	8	525	Crataegus laevigata/monogyna	18	625	Sanicula europaea	62	927
42	Quercus pubescens	8	100	Pinus sylvestris	18	214	Alliaria petiolata	59	1425
43	Pinus nigra	7	27	Torminalis glaberrima	18	125	Prunus avium	59	813
44	Sambucus nigra	7	41	Pyrus communis	17	94	Veronica officinalis	59	995
45	Aesculus hippocastanum	6	34	Robinia pseudoacacia	17	45	Campanula trachelium	58	988
46	Castanea sativa	6	13	Clematis vitalba	15	133	Corylus avellana	58	1114
47	Clematis vitalba	6	31	Ulmus laevis	15	39	Sambucus nigra	58	1218
48	Fraxinus ornus	6	64	Lonicera periclymenum	14	123	Veronica chamaedrys	57	1238
49	Populus alba	6	26	Ribes uva-crispa	14	198	Acer platanoides	56	3472
50	Pseudotsuga menziesii	6	52	Aria edulis	13	262	Melica uniflora	56	2995

North-America

rank	Tree layer	No. of regions	No. of plots	Herb layer	No. of regions	No. of plots
1	Abies balsamea	3	185	Maianthemum racemosum	9	330
2	Acer pensylvanicum	3	116	Mitchella repens	9	127
3	Acer rubrum	3	88	Arisaema triphyllum	8	262
4	Acer saccharum	3	165	Carex	8	376
5	Betula alleghaniensis	3	130	Galium triflorum	8	264
6	Prunus virginiana	3	38	Prunus serotina	8	299
7	Betula papyrifera	2	144	Quercus rubra	8	275
8	Fagus grandifolia	2	61	Acer rubrum	7	294
9	Fraxinus americana	2	15	Aralia nudicaulis	7	272
10	Fraxinus nigra	2	5	Brachyelytrum erectum	7	134
11	Picea	2	69	Caulophyllum thalictroides	7	121
12	Pinus strobus	2	9	Dryopteris carthusiana	7	162
13	Populus balsamifera	2	4	Eurybia macrophylla	7	196
14	Populus grandidentata	2	5	Laportea canadensis	7	170
15	Populus tremuloides	2	17	Lonicera canadensis	7	99
16	Prunus pensylvanica	2	21	Lysimachia borealis	7	217
17	Prunus serotina	2	22	Maianthemum canadense	7	365
18	Thuja occidentalis	2	16	Oryzopsis asperifolia	7	156
19	Tilia americana	2	28	Osmundastrum cinnamomeum	7	36
20	Tsuga canadensis	2	18	Osmundastrum claytonianum	7	120
21	Acer platanoides	1	1	Polygonatum biflorum	7	133
22	Alnus alnobetula	1	1	Rubus	7	95
23	Alnus incana	1	4	Solidago	7	48
24	Betula populifolia	1	1	Toxicodendron radicans	7	192
25	Larix laricina	1	1	Uvularia sessilifolia	7	140
26	Ostrya virginiana	1	2	Viola blanda	7	132
27	Picea glauca	1	11	Viola pubescens	7	237
28	Picea rubens	1	68	Acer saccharum	6	333
29	Quercus rubra	1	26	Amelanchier	6	151
30	Salix discolor	1	1	Amphicarpaea bracteata	6	193
31	Sorbus americana	1	41	Anemone quinquefolia	6	242
32	Ulmus americana	1	2	Athyrium filix-femina	6	213
33				Carya cordiformis	6	156
34				Circaea alpina	6	41
35				Circaea lutetiana	6	234
36				Clintonia borealis	6	132
37				Corylus americana	6	146
38				Fragaria virginiana	6	156
39				Fraxinus pennsylvanica	6	169
40				Hepatica americana	6	83
41				Huperzia lucidula	6	145
42				Monotropa uniflora	6	35
43				Nabalus altissimus	6	103
44				Osmorhiza claytonii	6	203
45				Ostrya virginiana	6	163
46				Panax trifolius	6	30
47				Pilosella aurantiaca	6	39
48				Pinus strobus	6	111
49				Poa pratensis	6	73
50				Polygonatum pubescens	6	208