Minnesota Seasons - giant ragweed


giant ragweed				More photos…
Ambrosia trifida var. trifida

Taxonomy	Family:	Asteraceae (aster)
	Subfamily:	Asteroideae
	Supertribe:	Helianthodae
	Tribe:	Heliantheae (sunflower)
	Subtribe:	Ambrosiinae

Nativity	Native
Status
Habitat	Moist soil. Disturbed sites, fields, roadsides.
Flowering	August to September
Flower Color	Green
Height	2′ to 9′

Identification	This plant is easily distinguished from other ragweeds by its palmately-lobed leaves.

Similar Species	The leaves of other ragweeds are pinnatifid (western ragweed) or bipinnatifid (common ragweed).

Range			Sources: 2, 3, 5, 7.

Sightings	Carver Park Reserve Cedar Mountain SNA Cottonwood River Prairie SNA Crow-Hassan Park Reserve Elm Creek Park Reserve Forestville/Mystery Cave State Park Hayes Lake State Park Joseph A. Tauer Prairie SNA Kasota Prairie SNA Kellogg-Weaver Dunes SNA Kellogg-Weaver Unit Lake Rebecca Park Reserve Lebanon Hills Regional Park Lost Valley Prairie SNA Louisville Swamp Lundblad Prairie SNA			Morton Outcrops SNA Myre-Big Island State Park Ordway Prairie Oronoco Prairie SNA Osmundson Prairie SNA Partch Woods SNA Pine Bend Bluffs SNA Racine Prairie SNA River Terrace Prairie SNA Rock Ridge Prairie SNA Rushford Sand Barrens SNA Shooting Star Prairie SNA Uncas Dunes SNA Wahpeton Prairie WMA Western Prairie SNA Wild Indigo Prairie SNA

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Plant

Leaves
	3-lobed		5-lobed

Inflorescence

Synonyms	Ambrosia trifida var. integrifolia

Common Names	giant ragweed great ragweed