Please cite this data as follows, and pay attention to the rights documented in the rights.txt: 
Please respect the rights declared for each dataset in the download: 
Oregon State University Herbarium (OSC)
GBIF-Spain: Sistema de Información de la vegetación Ibérica y Macaronésica
Real Jardín Botánico (CSIC): Real Jardin Botanico (Madrid), Vascular Plant Herbarium (MA)
Conservatoire botanique national du Bassin parisien: Observations du Conservatoire botanique national du Bassin parisien.
Naturalis Biodiversity Center: Naturalis Biodiversity Center (NL) - Botany Wageningen
SPN - Service du Patrimoine naturel, Muséum national d'Histoire naturelle, Paris: Inventaire National du Patrimoine Naturel : Flore de l'Ain
Aranzadi Science Society: Base de datos de plantas vasculares del País Vasco: ARAN-EH
EURISCO, the European PGR Search Catalogue                 http://eurisco.ecpgr.org/_1About/9Legal/index.php
SPN - Service du Patrimoine naturel, Muséum national d'Histoire naturelle, Paris: Inventaire National du Patrimoine Naturel : Flore Franco-Belge
European Molecular Biology Laboratory (EMBL): Geographically tagged INSDC sequences
Naturalis Biodiversity Center: Naturalis Biodiversity Center (NL) - Botany Leiden
UK National Biodiversity Network: Dr Francis Rose Field Notebook Project - Field Notebook Records of Dr Francis Rose 1950's to 1990's
Finnish Museum of Natural History: Herbarium, Botany Unit, Finnish Museum of Natural History (H)
GBIF-Sweden: OHN
Botanical Institute of Barcelona (CSIC - Ayuntamiento de Barcelona): Institut Botanic de Barcelona, BC-Histórico
Tiroler Landesmuseum Ferdinandeum: Tiroler Landesmuseum Ferdinandeum
National Biodiversity Data Centre: BSBI tetrad data for Ireland
Van Landuyt W, Vanhecke L, Brosens D (2012) Florabank 1: a grid-based database on vascular plant distribution in the northern part of Belgium (Flanders and the Brussels Capital region). PhytoKeys 12: 59–67. doi:10.3897/phytokeys.12.2849, http://dx.doi.org/10.3897/phytokeys.12.2849
Missouri Botanical Garden: Missouri Botanical Garden
National Museum of Natural History Luxembourg Recorder database
Renker, C. (Ed.) 2013+ (continuously updated): Botanical Field Data at Naturhistorisches Museum Mainz / Landessammlung für Naturkunde Rheinland-Pfalz (MNHM).
National Biodiversity Data Centre: Irish Crop Wild Relative Database
Herbario de la Universidad de Salamanca (SALA)
Herbario Universidad de Málaga (MGC). Herbarium collections online databases.
Botanical Institute of Barcelona (CSIC - Ayuntamiento de Barcelona): Institut Botanic de Barcelona, BC
Alterra, Wageningen UR: Dutch Vegetation Database (LVD)
GEO-Tag der Artenvielfalt: BUND - Dassower See (Lübeck/Dassow)
Botanical Garden, University of Valencia: Jardi Botanic de Valencia: VAL
Department of Organisms and Systems Biology. University of Oviedo: Universidad de Oviedo. Departamento de Biología de Organismos y Sistemas: FCO
National Biodiversity Data Centre: The Flora of County Wexford
UK National Biodiversity Network: Northern Ireland Environment Agency - EHS Species Datasets
Renker, C. (Ed.) 2010+ (continuously updated): Digitised specimen data at Naturhistorisches Museum Mainz / Landessammlung für Naturkunde Rheinland-Pfalz (MNHM).
Dept. of Vegetal Biology and Ecology, Faculty of Experimental Science, University of Almeria: Herbario de la Universidad de Almeria
GEO-Tag der Artenvielfalt: Wangerooge
Natural History Museum, University of Oslo: Vascular plant herbarium, Agder naturmuseum og botaniske hage
Sóller Botanical Garden Foundation: Hortus Botanicus Sollerensis Herbarium (FBonafè)
http://www.cpbr.gov.au/cpbr/herbarium
UK National Biodiversity Network: Merseyside BioBank - North Merseyside Flowering Plants (verified)
naturgucker.de: naturgucker
Datenbank FLORKART, BfN und NetPhyD
UK National Biodiversity Network: Suffolk Biological Records Centre - Suffolk Biological Records Centre (SBRC) dataset
Dutch Foundation for Botanical Research (FLORON): FLORIVON
UK National Biodiversity Network: South East Wales Biodiversity Records Centre - CCW Regional Data : South East Wales Non-sensitive Species Records
Tela Botanica: Carnet en Ligne
UK National Biodiversity Network: Botanical Society of the British Isles - Vascular Plants Database additions since 2000
UK National Biodiversity Network: Merseyside BioBank - Merseyside BioBank Active Naturalists (unverified)
ArtDatabanken: Artdata
ACEDO C. et LLAMAS F. -2006 onwards- LEB Vascular Plants Collections Online Databases. En la Web: http://www.gbif.es
SPN - Service du Patrimoine naturel, Muséum national d'Histoire naturelle, Paris: Inventaire National du Patrimoine Naturel : Flore d'Ille-et-Vilaine
BeBIF Provider: Belgian IFBL Flora Checklists (1939-1971)
Council of Heads of Australasian Herbaria (CHAH): Australia's Virtual Herbarium
Lund Botanical Museum (LD): Lund Botanical Museum (LD)
Department of Bioscience, Aarhus University: Vegetation data from protected areas in Denmark (§ 3 in the Danish Nature Protection Act)
GBIF-Spain: Universidad de Navarra, Herbarium: PAMP-Vascular Plants
Department of Organisms and Systems Biology. University of Oviedo: Universidad de Oviedo. Departamento de Biología de Organismos y Sistemas: FCO-Briof
F.J. Salgueiro, S. Talavera et al. (2006). SEV collections online data bases
UK National Biodiversity Network: Merseyside BioBank - North Merseyside Flowering Plants (unverified)
Natural History Museum, University of Oslo: Vascular Plant Herbarium, Trondheim (TRH)
Ernst-Moritz-Arndt-Universitaet: Floristic Databases of Mecklenburg-Pomerania - Higher Plants
University Museums of Norway
Willing, E. (Ed.) 1978 - (continuously updated): Herbarium collection of Eckhard Willing at the Herbarium Berolinense (B).
UK National Biodiversity Network: Botanical Society of the British Isles - Vascular Plants Database
Anthos: Spanish Plants Information System, Biodiversity Foundation-Royal Botanical Garden, CSIC: Fundación Biodiversidad, Real Jardín Botánico (CSIC): Anthos. Sistema de Información de las plantas de España
National Biodiversity Data Centre: Irish vascular plant data 1999-2009
Herbario de la Universidad de Alicante, ABH (2005).
Natural History Museum, University of Oslo: Vascular Plant Herbarium, Oslo (O)
Danish Nature Agency: Vascular plants in Denmark recorded under the The Nationwide Monitoring and Assessment Programme for the Aquatic and Terrestrial Environments (NOVANA)
WAHerb
Natural History Museum Maastricht: Natural History Museum Maastricht (NL) - Herbarium
Natural History Museum, Vienna - Herbarium W: Natural History Museum, Vienna - Herbarium W
UK National Biodiversity Network: Bristol Regional Environmental Records Centre - BRERC October 2009
Botanical Garden & Museum, Natural History Museum of Denmark: Botany registration database by Danish botanists
National Biodiversity Data Centre: The Flora of County Waterford
GEO-Tag der Artenvielfalt: Ried und Sand - Artenvielfalt durch Beweidung
Herrera, M. et al. (2004). BIO Vascular Plants Collections on line databases.
Röpert, D. (Ed.) 2000 - (continuously updated): Digital specimen images at the Herbarium Berolinense (B).
NA
GEO-Tag der Artenvielfalt: Schatzinsel Norderney
SPN - Service du Patrimoine naturel, Muséum national d'Histoire naturelle, Paris: Inventaire National du Patrimoine Naturel (I093) : Flore du Massif Armoricain
Winch N (2014) Flora of Northumberland and Durham. Quentin Groom (ed.) Advanced Books: e4002. doi: 10.3897/ab.e4002, doi: 10.3897/ab.e4002
National Biodiversity Data Centre: Online Atlas of vascular plants 2012-2020
UK National Biodiversity Network: Joint Nature Conservation Committee - Vegetation surveys of coastal shingle in Great Britain
Naturalis Biodiversity Center: Nationaal Herbarium Nederland
Conservatoire et Jardin botaniques de la Ville de Genève. Botanical Information System of Geneva