Cirsium

Genus · 5 species with a result in Ohio

creeping thistle (Cirsium arvense)

creeping thistleCirsium arvense · Flowering plantsPhoto © Adja Gaye · CC BY-NC 4.0Early May to mid-October, middle week Jul 12–18

Bull Thistle (Cirsium vulgare)

Bull ThistleCirsium vulgare · Flowering plantsPhoto © Sabine Atteln · CC BY-NC 4.0Mid-April to early October, middle week Aug 9–15

swamp thistle (Cirsium muticum)

swamp thistleCirsium muticum · Flowering plantsPhoto © aarongunnar · CC BY 4.0Late May to mid-October, middle week Aug 23–29

field thistle (Cirsium discolor)

field thistleCirsium discolor · Flowering plantsPhoto © Riley-Brendan Walsh · CC BY-NC 4.0Early June to early October, middle week Aug 30 – Sep 5

Tall Thistle (Cirsium altissimum)

Tall ThistleCirsium altissimum · Flowering plantsPhoto © Suzanne Cadwell · CC BY-NC 4.0

Missing records do not mean a species is absent.