[Wildflowers of the Sunflower Family with Button-like Flower Heads]

Cockleburs East of the Cascade Mountains of Oregon and Washington

Xanthium strumarium

Canada Cocklebur, Common Cocklebur: Xanthium strumarium var. canadense (Synonyms: Xanthium acerosum, Xanthium californicum, Xanthium californicum var. rotundifolium, Xanthium campestre, Xanthium canadense, Xanthium cavanillesii, Xanthium cenchroides, Xanthium commune, Xanthium echinatum, Xanthium glanduliferum, Xanthium italicum, Xanthium macounii, Xanthium oligacanthum, Xanthium oviforme, Xanthium pensylvancum, Xanthium saccharatum, Xanthium speciosum, Xanthium strumarium ssp. italicum, Xanthium strumarium var. oviforme, Xanthium strumarium var. pensylvanicum, Xanthium varians)

The photo above shows common cocklebur on the beach at Dalton Point in the western Columbia River Gorge..........September 1, 2007.

Spiny Clotbur, Spiny Cocklebur: Xanthium spinosum (Synonyms: Acanthoxanthium spinosum, Xanthium spinosum)

Canada Cocklebur, Common Cocklebur, Rough Cocklebur: Xanthium strumarium (Synonyms: Xanthium strumarium var. canadense, Xanthium strumarium var. glabratum, Xanthium strumarium var. oviforme, Xanthium strumarium var. pensylvanicum, Xanthium strumarium var. wootonii )

Rough Cocklebur: Xanthium strumarium var. glabratum (Synonyms: Xanthium americanum, Xanthium calvum, Xanthium chasei, Xanthium chinense, Xanthium curvescens, Xanthium cylindraceum, Xanthium echinellum, Xanthium globosum, Xanthium inflexum, Xanthium macrocarpum var. glabratum, Xanthium occidentale, Xanthium orientale, Xanthium strumarium var. wootoni, Xanthium wootoniii)

Paul Slichter