Rough Cocklebur
Xanthium strumarium Linnaeus
Rough Cocklebur: https://marylandbiodiversity.com/species/4455
Synonyms
Xanthium americanum  Xanthium canadense  Xanthium chinense  Xanthium cylindraceum  Xanthium echinatum  Xanthium echinellum  Xanthium pensylvanicum  Xanthium speciosum  Xanthium strumarium var. canadense  Xanthium strumarium var. glabratum 
Total Records
by Month
For Jan - Dec from 1901 - 2025
JanFebMarAprMayJunJulAugSepOctNovDec024681012141618Totals

Source: Maryland Biodiversity Project database

Total Records
by Year
190519101915192019251930193519401945195019551960196519701975198019851990199520002005201020152020202501020304050Totals

Source: Maryland Biodiversity Project database