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Lanceleaf Ragweed

Ambrosia bidentata Michx.

Asteraceae (Sunflower Family)

▲▼ mature plants

 

▲ mature plant

 

▲▼stem, leaves and inflorescences

▲inflorescence detail

Ambrosia bidentata Michx., Lanceleaf Ragweed: (Bayer Code:  AMBBI; US Code AMBI2)

·         Is a moderately-branched native summer annual weed with upward-bent lance-shaped  or narrowly 3-lobed leaves (2-3 feet tall)

·         Inflorescence is larger than common ragweed, and has downward-curving bracts between flower clusters in the spike (helps distinguish from annual marshelder, which has upward-pointing bracts between flowers in spike); also allergenic

·         Prefers moist soils, but may grow in any fertile soil

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Updated 19 January 2019