https://www.pollenlibrary.com/Local/Specie/Salix+fragilis/in/Montcalm%20County/MI/
Crack Willow (Salix fragilis) Species Details and Allergy Info, Montcalm county, Michigan
Salix fragilis Research Information. Crack Willow allergy information and photos, Montcalm county, Michigan
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https://nouvelle-aquitaine.kollect.fr/observatoire/index.php?module=fiche&action=fiche&d=flore&id=120040
Salix x fragilis
Fiche de Salix x fragilis
salix x fragilis
https://research.unipd.it/handle/11577/2523980
Sulfadiazine Uptake and Effects on Salix fragilis L. and Zea mays L. Plants
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