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Plants of river and pond shores, coastal beaches, salt marshes and waste places.  Flowers late August through September.  Native.  Our plants are:

[ Xanthium strumarium var. canadense (P. Mill.) Torr. & Gray ]

Annual.  Typical height is 2 to 3 feet (infrequently much taller).

Inflorescences are   

Flower heads are discoid, unisexual.  Carpellate (female) and staminate (male) heads occur on the same plant, in clusters, staminate heads located above carpellate heads.  Carpellate florets are 2 per head, lacking corollas; at maturity, enclosed within a bur.  Staminate heads are deciduous at maturity, their florets are greenish.

Basal leaves

 

 

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Note:  This species is related to the ragweeds (Ambrosia spp.).

 

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