https://www.inaturalist.org/journal/blue_celery/40104-erigeron-bonariensis-vs-canadensis-vs-sumatrensis

Identification:
http://alienplantsbelgium.be/content/cardamine
https://www.researchgate.net/profile/Artem_Leostrin/publication/336141491_Current_State_and_Distribution_of_Alien_Weedy_Cardamine_occulta_Hornem_Brassicaceae_in_European_Russia/links/5d9221cf458515202b76ce2d/Current-State-and-Distribution-of-Alien-Weedy-Cardamine-occulta-Hornem-Brassicaceae-in-European-Russia.pdf
https://www.researchgate.net/publication/331552780_Cardamine_occulta_-_inconspicuous_neophyte_in_Slovakia
https://cyberleninka.ru/article/n/melkotsvetkovye-serdechniki-sektsii-pteroneuron-dc-rouy-et-fouc-cardamine-l-cruciferae-vo-flore-evropeyskoy-rossii/pdf
https://academic.oup.com/botlinnean/article-abstract/187/3/456/5039644

Other works
http://db.plantentuinmeise.be/DUMORTIERA/DUM_115/Dum_115_58-60_Cardamine_graeca.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4856903/

@optilete kindly informed us of the publication of the English version of this very interesting book:
https://forum.inaturalist.org/t/a-field-guide-to-invasive-alien-species-in-european-forests-2019-free-online-resource/8427

https://www.tujerodne-vrste.info/wp-content/uploads/2019/12/Field-Guide-Alien-species-in-European-Forests.pdf

Often users take for granted that all perennial sunflowers are to be identified as Helianthus tuberosus. Actually many, if not most, observations depict Helianthus x laetiflorus.
Here some works on the two taxa:
https://www.biodiversitylibrary.org/item/14536#page/129/mode/1up
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=114871
https://www.researchgate.net/profile/Lajos_Balogh4/publication/296815285_Sunflower_species_Helianthus_spp/links/56dabfbd08aee73df6d2ab23/Sunflower-species-Helianthus-spp.pdf
https://www.degruyter.com/downloadpdf/j/botlit.2014.20.issue-2/botlit-2014-0018/botlit-2014-0018.pdf

KeyBase: (from the homepage) is a database and web application for managing and deploying interactive pathway keys to plants, animals and other groups of organisms:
https://keybase.rbg.vic.gov.au/

1) Staminodes (petals) pink. Hypanthium abruptly narrowed into peduncle. Receptacle flat. Upper leaves distinctly saber-shaped: C. (affinis) acinaciformis

1A) Staminode (petals) pale yellow (rarely yellow), sometimes pale pink when senescing. Hypanthium gradually narrowed. Receptacle raised. All leaves not saber-shaped: C. edulis subsp. edulis

C. (affinis) acinaciformis
https://www.inaturalist.org/observations/26048235

C. edulis subsp. edulis:
https://www.inaturalist.org/observations/26048296

Atlas de las Plantas AlóctonasInvasoras en España
http://www.animalrecord.net/Atlas_Plantas_Aloctonas_Espana.pdf

Guia Prático para a Identiicação de Plantas Invasoras em Portugal
https://www.researchgate.net/profile/Elizabete_Marchante/publication/263350485_Guia_Pratico_para_a_Identificacao_de_Plantas_Invasoras_em_Portugal/links/559fdf9308ae6981ff78c7ff/Guia-Pratico-para-a-Identificacao-de-Plantas-Invasoras-em-Portugal.pdf

Naturalized alien flora of the world: species diversity, taxonomicand phylogenetic patterns, geographic distribution and globalhotspots of plant invasion

http://www.preslia.cz/P173Pysek.pdf

The most important INVASIVE PLANTS in Hungary
https://www.researchgate.net/profile/Zoltan_Botta-Dukat/publication/311796497_The_most_important_invasive_plants_in_Hungary/links/585ae02b08ae329d61f1480f/The-most-important-invasive-plants-in-Hungary.pdf#page=14

The Global Naturalized Alien Flora (GloNAF) database
https://glonaf.org/