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Ambrosia ×helenae

Ambrosia ×helenae Rouleau

Ragweed, Helen Ragweed

Asteraceae (Aster Family)

Synonym(s):

USDA Symbol: AMHE3

USDA Native Status: L48 (N), CAN (N)

Natural hybrid between Ambrosia artemisiifolia and Ambrosia trifida.

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Plant Characteristics

Duration: Perennial
Habit: Herb
Size Notes: Up to about 5 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: White , Yellow , Green
Bloom Time: Jul , Aug , Sep , Oct , Nov
Bloom Notes: Flowers are inconspicuous and without ray florets.

Distribution

USA: AR , CT , IA , IL , MI , NY , OH
Canada: ON , QC

Web Reference

Webref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

USDA: Find Ambrosia �helenae in USDA Plants
FNA: Find Ambrosia �helenae in the Flora of North America (if available)
Google: Search Google for Ambrosia �helenae

Metadata

Record Modified: 2018-12-11
Research By: CBR

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