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Cicuta bulbifera

Bulblet-bearing water hemlock

Cicuta virosa

Cowbane

Cinchona calisaya

Ledgerbark

Cirsium brevistylum

Indian thistle

Chusquea abietifolia

Cichorium intybus

Belgium endive

Chrysothamnus vaseyi

Cirsium edule

Edible thistle

Cirsium heterophyllum

Melancholy thistle

Cirsium hookerianum

White thistle

Cirsium horridulum

Horrid thistle

Cirsium spinosissimum

Alpen-kratzdistel

Cirsium mexicanum

Mexican thistle

Cirsium texanum

Texas purple thistle

Cirsium praeteriens

Cirsium canescens

Gynoxys cutervensis

Fleischmannia ejidensis

Cirsium pitcheri

Cirsium vulgare

Black thistle